CN114603701A - Production and processing method of green prestressed laminated slab - Google Patents
Production and processing method of green prestressed laminated slab Download PDFInfo
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- CN114603701A CN114603701A CN202210381744.7A CN202210381744A CN114603701A CN 114603701 A CN114603701 A CN 114603701A CN 202210381744 A CN202210381744 A CN 202210381744A CN 114603701 A CN114603701 A CN 114603701A
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 26
- 238000003672 processing method Methods 0.000 title claims abstract description 7
- 239000004567 concrete Substances 0.000 claims abstract description 215
- 239000000654 additive Substances 0.000 claims abstract description 64
- 230000000996 additive effect Effects 0.000 claims abstract description 61
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 37
- 238000002156 mixing Methods 0.000 claims abstract description 36
- 238000003756 stirring Methods 0.000 claims abstract description 35
- 239000002994 raw material Substances 0.000 claims abstract description 19
- 238000009826 distribution Methods 0.000 claims abstract description 11
- 238000010008 shearing Methods 0.000 claims abstract description 3
- 239000002245 particle Substances 0.000 claims description 101
- 230000002787 reinforcement Effects 0.000 claims description 73
- 239000003245 coal Substances 0.000 claims description 52
- 239000000843 powder Substances 0.000 claims description 44
- 239000004568 cement Substances 0.000 claims description 34
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 33
- 239000000839 emulsion Substances 0.000 claims description 33
- 238000012360 testing method Methods 0.000 claims description 26
- 238000010438 heat treatment Methods 0.000 claims description 25
- 239000002699 waste material Substances 0.000 claims description 21
- 239000007822 coupling agent Substances 0.000 claims description 20
- 239000004115 Sodium Silicate Substances 0.000 claims description 19
- 238000010276 construction Methods 0.000 claims description 19
- 229920006327 polystyrene foam Polymers 0.000 claims description 19
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 19
- 229910052911 sodium silicate Inorganic materials 0.000 claims description 19
- 239000004794 expanded polystyrene Substances 0.000 claims description 18
- 238000012216 screening Methods 0.000 claims description 18
- 238000012545 processing Methods 0.000 claims description 16
- 239000002131 composite material Substances 0.000 claims description 15
- 241000264877 Hippospongia communis Species 0.000 claims description 11
- 230000035772 mutation Effects 0.000 claims description 11
- 230000000630 rising effect Effects 0.000 claims description 7
- XYXNTHIYBIDHGM-UHFFFAOYSA-N ammonium thiosulfate Chemical compound [NH4+].[NH4+].[O-]S([O-])(=O)=S XYXNTHIYBIDHGM-UHFFFAOYSA-N 0.000 claims description 5
- 210000002435 tendon Anatomy 0.000 claims description 4
- 238000001514 detection method Methods 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 24
- 230000008901 benefit Effects 0.000 abstract description 5
- 229910000831 Steel Inorganic materials 0.000 description 27
- 239000010959 steel Substances 0.000 description 27
- 238000012423 maintenance Methods 0.000 description 25
- 230000008569 process Effects 0.000 description 15
- 239000000203 mixture Substances 0.000 description 14
- 238000002360 preparation method Methods 0.000 description 14
- 238000009434 installation Methods 0.000 description 9
- 239000013078 crystal Substances 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 239000002244 precipitate Substances 0.000 description 2
- 230000002195 synergetic effect Effects 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 239000011265 semifinished product Substances 0.000 description 1
- LSNNMFCWUKXFEE-UHFFFAOYSA-L sulfite Chemical compound [O-]S([O-])=O LSNNMFCWUKXFEE-UHFFFAOYSA-L 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B23/00—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects
- B28B23/02—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects wherein the elements are reinforcing members
- B28B23/04—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects wherein the elements are reinforcing members the elements being stressed
- B28B23/043—Wire anchoring or tensioning means for the reinforcements
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B1/00—Producing shaped prefabricated articles from the material
- B28B1/04—Producing shaped prefabricated articles from the material by tamping or ramming
- B28B1/045—Producing shaped prefabricated articles from the material by tamping or ramming combined with vibrating or jolting
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B11/00—Apparatus or processes for treating or working the shaped or preshaped articles
- B28B11/24—Apparatus or processes for treating or working the shaped or preshaped articles for curing, setting or hardening
- B28B11/245—Curing concrete articles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B23/00—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects
- B28B23/02—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects wherein the elements are reinforcing members
- B28B23/022—Means for inserting reinforcing members into the mould or for supporting them in the mould
- B28B23/024—Supporting means
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B5/00—Floors; Floor construction with regard to insulation; Connections specially adapted therefor
- E04B5/16—Load-carrying floor structures wholly or partly cast or similarly formed in situ
- E04B5/17—Floor structures partly formed in situ
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Structural Engineering (AREA)
- Architecture (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Civil Engineering (AREA)
- Manufacturing Of Tubular Articles Or Embedded Moulded Articles (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The application discloses a production and processing method of a green prestressed laminated slab. Mixing the raw materials, adding an additive, adding water, and stirring to obtain prepared concrete; installing a stressed main rib and stretching the prestressed rib; installing a lock rib plate and a template; binding distribution ribs; binding a lifting hook and installing an opening embedded part; pouring prepared concrete, uniformly paving the concrete on a beach, and vibrating to compact the concrete; after the initial setting state is reached, removing the lock rib plate, and then maintaining; and finally shearing ribs, removing the mold, and lifting and stacking. The laminated slab produced by the method has higher rigidity and good bearing performance. Can meet the building requirements of various different load requirements. The laminated slab has the advantages of light weight, small volume and convenient transportation. The method provided by the invention is environment-friendly, energy-saving and sustainable, and completely meets the requirements of modern green buildings.
Description
Technical Field
The application relates to the technical field of building materials, in particular to a production and processing method of a green prestressed laminated slab.
Background
The steel structure house is light in weight, good in anti-seismic performance, recyclable, convenient for modular design, standardized manufacture, serial production and assembly construction, and easy to form an assembly integrated green ecological house. At present, the bottlenecks restricting the development of steel structure houses are mainly floors (or roof panels) and inner and outer walls (panels). The common steel structure residential floor slab is a common cast-in-place concrete floor slab and a profiled steel sheet combined floor slab. The cast-in-place concrete floor has low cost, needs to support templates and scaffolds on site, has serious site pollution and long construction period, and is not easy to form steel structure house assembly; the profiled steel sheet composite floor can save templates and scaffolds, but the profiled steel sheet needs to be coated with fireproof paint, and a suspended ceiling is additionally arranged, so that the cost is higher, and the profiled steel sheet composite floor is not beneficial to the benign development of steel structure houses.
The prestressed composite slab overcomes the defects of the two floors, and has the advantages of no template, good integrity, convenient construction, short construction period and low cost. However, the conventional prestressed composite slab has a simple structure plane form, the thickness is generally only 6cm, the rigidity and the bearing capacity of the conventional prestressed composite slab belong to a semi-finished product or an unstable state before the pouring of the laminated layer is finished, and the occurrence of cracks is a common quality problem of the prestressed composite slab. In addition, because the thickness of the laminated plate is generally thinner, the rigidity is insufficient under the condition of larger plate span, the midspan deflection of the prefabricated part is larger when the prefabricated part bears the construction load, and the mechanical problem of the joint surface of the prefabricated part and the cast-in-place part needs to be solved.
Disclosure of Invention
Aiming at the defects in the prior art, the application mainly aims to provide the production and processing method of the green prestressed laminated slab, and the prestressed laminated slab obtained by the method can effectively avoid the occurrence of later-stage cracks. In addition, the method of the invention is environment-friendly, energy-saving and sustainable, and completely meets the requirements of modern green buildings.
In order to achieve the purpose, the invention provides a production and processing method of a green prestressed laminated slab, which comprises the following steps:
step 1, mixing the coal gangue fine powder, the sulphoaluminate cement and the large-particle recycled aggregate, adding an additive, adding water, and stirring to obtain prepared concrete;
step 2, installing a stressed main rib, stretching the prestressed rib, and performing stress detection; installing a lock rib plate and a template; binding distribution ribs; binding a lifting hook and installing an opening embedded part;
step 3, pouring the prepared concrete obtained in the step 1 into a mould, uniformly paving the concrete on a beach, and vibrating to compact the concrete without bubbles and honeycombs; after the initial setting state is reached, removing the lock rib plate, and then maintaining;
and 4, when the strength of the test block cured under the same conditions reaches 75% of the designed compressive strength of the concrete cube, releasing and tensioning the prestressed tendons, shearing the tendons, removing the mold, and lifting and stacking.
Specifically, the particle size of the coal gangue fine powder is controlled and is selected to be less than 3 mm. The aggregate is prepared by crushing and screening waste concrete in the construction waste for the large-particle recycled aggregate, the particle size of the aggregate is controlled, and particles larger than 4.75mm are selected. The aggregate adopted by the invention has rough surface, multiple edges and corners, large specific surface area and large water absorption capacity, so that the unit water consumption is larger than that of common concrete when the aggregate is used for preparing concrete, and the slump loss of the concrete is also large. The strength and the elastic modulus of the large-particle recycled aggregate selected by the invention are about 2/3 of natural aggregate concrete.
Specifically, in step 1 of the invention, the raw materials comprise the following components in parts by weight: 30-40 parts of coal gangue fine powder, 8-10 parts of sulphoaluminate cement, 25-30 parts of large-particle recycled aggregate, 2-5 parts of additive and 20-30 parts of water. The integral formula of the prepared concrete and the addition of the additive enable the synergistic effect of all the substances to better improve the water retention and the workability of the mixing material.
Specifically, in the step 1 of the invention, the additive is obtained by mixing 1-3 parts of expanded polystyrene foam particles, 1-2 parts of sodium silicate and a coupling agent, adding 20-30 parts of acrylic emulsion, and stirring. The polystyrene foam particles are added into the additive, so that the additive can play a role in filling and reducing volume weight. Meanwhile, the synergistic effect of the components such as sodium silicate and acrylic emulsion can better stimulate the gel activity of the fine powder of the sulphoaluminate cement and the coal gangue.
Specifically, in the step 2 of the invention, the distance between the main ribs should be uniform, and the main ribs are firstly straightened manually during installation to ensure that the initial states of the main ribs are consistent, so as to ensure that the stress deviation of each steel wire is within an allowable range after the whole tensioning. The prestressed steel wire adopts a one-time tensioning process, namely 0-1.03 sigma con, wherein sigma con is 0.8 fptk. After the main reinforcements are tensioned, the actual tension stress of not less than 5 reinforcements is sampled and detected by each seat. The allowable deviation of the tensile stress is controlled within +/-5%.
Specifically, in the step 3 of the invention, the slump of the concrete is controlled to be 6-8 cm. And in the pouring, the depth of the scratches on the surface of the thin plate is not less than 4mm, and the concrete pouring is finished. The maintenance adopts steam maintenance; the temperature rising speed is 28-30 ℃/h, the constant-temperature curing stage is carried out, the temperature is controlled to be 80-90 ℃, the heating can be stopped when the strength of the concrete test block meets the requirement, and after the heating is stopped, the thin plate is slowly cooled, so that the concrete thin plate is prevented from generating shrinkage cracks due to temperature mutation.
Specifically, in the step 4 of the invention, after the strength of the concrete test block reaches 70-75% of the standard curing strength, the prestressed reinforcement is cut off, and the concrete is prestressed by means of the adhesion of the concrete and the prestressed reinforcement.
Further, in the improved scheme of the invention, in step 3, the prepared concrete is added in three times, and the proportion of the addition amount of each time is as follows: 1:2:1, and the time interval of each addition is 30-45 minutes.
Specifically, in the step 3, the prepared concrete is added and vibrated to be compact and free of air bubbles and honeycombs, the prepared concrete is poured after 30 minutes, and the vibrating step is repeated; and after 30 minutes, pouring the prepared concrete again, and repeating the vibrating step. The proportion of the prepared concrete added for three times is as follows: 1:2: 1.
furthermore, according to the improvement scheme, the additive is improved, and the additive is obtained by mixing 1-3 parts of expanded polystyrene foam particles, 1-2 parts of sodium silicate, 0.01-0.02 part of ammonium thiosulfate and a coupling agent, then adding 20-30 parts of acrylic emulsion, and stirring. The original additive is additive a, and the improved additive is additive b. Preparing concrete obtained by adopting the additive a as prepared concrete a; and the prepared concrete obtained by adopting the additive b is prepared concrete b.
Specifically, in the step 3, the prepared concrete b is added for the first time, vibrated to be compact and free of air bubbles and honeycombs, the prepared concrete a is poured for the second time after 30 minutes, and the vibrating step is repeated; and after 30 minutes, pouring the prepared concrete b for the third time, and repeating the vibrating step. The proportion of the prepared concrete added for three times is as follows: 1:2: 1.
has the advantages that: the laminated slab produced by the method has higher rigidity and good bearing performance. The laminated slab has strong load applicability, allows additional load to be 0 kN-10.0 kN per square besides the self weight of the prefabricated ribbed thin slab and the laminated layer, and can meet the building requirements of various different load requirements.
The laminated slab produced by the method has better durability, does not generate cracks or reduce the width of the cracks, and can reduce the corrosion of atmosphere or corrosive media to the reinforcing steel bars, thereby prolonging the service life of the member.
The invention has high economic benefit. The template engineering is a link with relatively serious material waste in the construction process, and the laminated slab does not need to be provided with a template support in the construction process and has the advantages of economy and environmental protection. The prefabricated bottom plate can be industrially produced, and the construction period can be greatly shortened due to partial mechanization in the construction process.
The invention selects the recycled aggregate, recycles the existing substances, has the characteristics of environmental protection and sustainable development. In addition, the laminated slab is light in weight and small in size, so that the laminated slab is very convenient to transport.
The improved scheme of the invention has better effect in the aspects of solving the problem of cracks of the laminated slab and the mechanical problem of the joint surface of the prefabricated part and the cast-in-place part.
Detailed Description
In order to make the technical solutions of the present application better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the embodiments of the present application, and it is obvious that the described embodiments are only some embodiments of the present application, but not all embodiments.
The parts, ratios, and the like described in the present embodiment refer to parts by mass and ratios by mass.
Example 1
Preparation of the additive: mixing 2 parts of expanded polystyrene foam particles, 1 part of sodium silicate and a coupling agent, adding 25 parts of acrylic emulsion, and stirring to obtain the acrylic emulsion.
Preparing large-particle recycled aggregate: the aggregate is prepared by crushing and screening waste concrete in construction waste, the particle size of the aggregate is controlled, and particles larger than 4.75mm are selected.
Preparing coal gangue fine powder: crushing the coal gangue, then screening, and selecting particles with the particle size of less than 3 mm.
Preparing the prepared concrete: mixing the fine coal gangue powder, the sulphoaluminate cement and the large-particle recycled aggregate, adding the additive, adding water, and stirring to obtain the prepared concrete. The mixture ratio of each component of the raw materials is as follows: 35 parts of coal gangue fine powder, 8 parts of sulphoaluminate cement, 28 parts of large-particle recycled aggregate, 3 parts of additive and 30 parts of water.
And (3) production and processing of the laminated plate: installing a stressed main rib, stretching the prestressed rib, and detecting stress; installing a lock rib plate and a template; binding distribution ribs; binding lifting hooks and installing hole embedded parts. The main reinforcement interval should be even, and manual straightening is earlier in the installation, lets the initial condition of main reinforcement unanimous to guarantee that whole stretch-draw back, each steel wire stress deviation is in the allowed band. The prestressed steel wire adopts a one-time tensioning process, namely 0-1.03 sigma con, wherein sigma con is 0.8 fptk. After the main reinforcements are tensioned, the actual tension stress of not less than 5 reinforcements is sampled and detected by each seat. The allowable deviation of the tensile stress is controlled within +/-5%.
Pouring the prepared concrete obtained in the step, uniformly paving the concrete on a beach, and vibrating to ensure that the concrete is compact, and has no bubbles and no honeycombs; the slump of the concrete is controlled to be 7 cm. And in the pouring, the depth of the scratches on the surface of the thin plate is not less than 4mm, and the concrete pouring is finished.
After the initial setting state is reached, removing the lock rib plate, and then maintaining; the maintenance adopts steam maintenance; the heating speed is 29 ℃/h, the constant-temperature curing stage is carried out, the temperature is controlled to be 85 ℃, the heating can be stopped when the strength of the concrete test block meets the requirement, and after the heating is stopped, the thin plate is slowly cooled, so that the thin plate of the concrete is prevented from generating shrinkage cracks due to temperature mutation.
When the strength of the test block cured under the same conditions reaches 75% of the designed compressive strength of the concrete cube, the prestressed reinforcement is released, then the reinforcement is sheared, the prestressed reinforcement is sheared, and the concrete is prestressed by means of the adhesion of the concrete and the prestressed reinforcement. Then the mould is removed, and the stack is lifted and piled.
And (3) testing and calculating:
adopting surface load and pressure of 5.48N/mm2And is applied to the top surface of the laminated slab. Applying 10Mpa pre-pressure on two sections of side surfaces, wherein the maximum value of mid-span deflection of the laminated slab is 22.01, and Dmax1/280. The maximum value of the principal stress is 1.41N/mm2And the laminated plate is not cracked.
Example 2
Preparation of the additive: mixing 3 parts of expanded polystyrene foam particles, 2 parts of sodium silicate and a coupling agent, adding 30 parts of acrylic emulsion, and stirring to obtain the acrylic emulsion.
Preparing large-particle recycled aggregate: the aggregate is prepared by crushing and screening waste concrete in construction waste, the particle size of the aggregate is controlled, and particles larger than 4.75mm are selected.
Preparing coal gangue fine powder: crushing the coal gangue, then screening, and selecting particles with the particle size of less than 3 mm.
Preparing the prepared concrete: mixing the fine coal gangue powder, the sulphoaluminate cement and the large-particle recycled aggregate, adding the additive, adding water, and stirring to obtain the prepared concrete. The mixture ratio of each component of the raw materials is as follows: 40 parts of coal gangue fine powder, 10 parts of sulphoaluminate cement, 30 parts of large-particle recycled aggregate, 5 parts of additive and 30 parts of water.
And (3) production and processing of the laminated plate: installing a stressed main rib, stretching the prestressed rib, and detecting stress; installing a lock rib plate and a template; binding distribution ribs; binding lifting hooks and installing hole embedded parts. The main reinforcement interval should be even, and manual straightening is earlier in the installation, lets the initial condition of main reinforcement unanimous to guarantee that whole stretch-draw back, each steel wire stress deviation is in the allowed band. The prestressed steel wire adopts a one-time tensioning process, namely 0-1.03 sigma con, and the sigma con is 0.8 fptk. After the main reinforcements are tensioned, the actual tension stress of not less than 5 reinforcements is sampled and detected by each seat. The allowable deviation of the tensile stress is controlled within +/-5%.
Pouring the prepared concrete obtained in the step, uniformly paving the concrete on a beach, and vibrating to ensure that the concrete is compact, and has no bubbles and no honeycombs; the slump of the concrete is controlled to be 8 cm. And in the pouring, the depth of the scratches on the surface of the thin plate is not less than 4mm, and the concrete pouring is finished.
After the initial setting state is reached, removing the lock rib plate, and then maintaining; the maintenance adopts steam maintenance; the temperature rising speed is 30 ℃/h, the constant-temperature maintenance stage is carried out, the temperature is controlled to be 90 ℃, the heating can be stopped when the strength of the concrete test block meets the requirement, and after the heating is stopped, the thin plate is slowly cooled, so that the thin plate of the concrete is prevented from generating shrinkage cracks due to temperature mutation.
When the strength of the test block cured under the same conditions reaches 75% of the designed compressive strength of the concrete cube, the prestressed reinforcement is released, then the reinforcement is sheared, the prestressed reinforcement is sheared, and the concrete is prestressed by means of the adhesion of the concrete and the prestressed reinforcement. Then the mould is removed, lifted and stacked.
Example 3
Preparation of the additive: mixing 1 part of expanded polystyrene foam particles, 1 part of sodium silicate and a coupling agent, adding 20 parts of acrylic emulsion, and stirring to obtain the acrylic emulsion. The method has no special requirements on the coupling agent, and only needs to use the conventional coupling agent and the conventional dosage.
Preparing large-particle recycled aggregate: the aggregate is prepared by crushing and screening waste concrete in construction waste, the particle size of the aggregate is controlled, and particles larger than 4.75mm are selected.
Preparing coal gangue fine powder: crushing the coal gangue, then screening, and selecting particles with the particle size of less than 3 mm.
Preparing the prepared concrete: mixing the fine powder of the coal gangue, the sulphoaluminate cement and the large-particle recycled aggregate, adding the additive, adding water and stirring to obtain the prepared concrete. The mixture ratio of each component of the raw materials is as follows: 30 parts of coal gangue fine powder, 8 parts of sulphoaluminate cement, 25 parts of large-particle recycled aggregate, 2 parts of additive and 20 parts of water.
And (3) production and processing of the laminated plate: installing a stressed main rib, stretching the prestressed rib, and detecting stress; installing a lock rib plate and a template; binding distribution ribs; binding lifting hooks and installing hole embedded parts. The main reinforcement interval should be even, and manual straightening is earlier in the installation, lets the initial condition of main reinforcement unanimous to guarantee that whole stretch-draw back, each steel wire stress deviation is in the allowed band. The prestressed steel wire adopts a one-time tensioning process, namely 0-1.03 sigma con, wherein sigma con is 0.8 fptk. After the main reinforcements are tensioned, the actual tension stress of not less than 5 reinforcements is sampled and detected by each seat. The allowable deviation of the tensile stress is controlled within +/-5%.
Pouring the prepared concrete obtained in the step, uniformly paving the concrete on a beach, and vibrating to compact the concrete without bubbles and honeycombs; the slump of the concrete is controlled to be 6 cm. And in the pouring, the depth of the scratches on the surface of the thin plate is not less than 4mm, and the concrete pouring is finished.
After the initial setting state is reached, removing the lock rib plate, and then maintaining; the maintenance adopts steam maintenance; the temperature rise speed is 28 ℃/h, the constant-temperature curing stage is carried out, the temperature is controlled to be 80 ℃, the heating can be stopped when the strength of the concrete test block meets the requirement, and after the heating is stopped, the thin plate is slowly cooled, so that the thin plate of the concrete is prevented from generating shrinkage cracks due to temperature mutation.
When the strength of the test block cured under the same conditions reaches 75% of the designed compressive strength of the concrete cube, the prestressed reinforcement is released, then the reinforcement is sheared, the prestressed reinforcement is sheared, and the concrete is prestressed by means of the adhesion of the concrete and the prestressed reinforcement. Then the mould is removed, lifted and stacked.
Example 4
Preparation of the additive: mixing 1 part of expanded polystyrene foam particles, 2 parts of sodium silicate and a coupling agent, adding 30 parts of acrylic emulsion, and stirring to obtain the acrylic emulsion.
Preparing large-particle recycled aggregate: aggregate prepared by crushing and screening waste concrete in construction waste, controlling the particle size of the aggregate and selecting particles larger than 4.75 mm.
Preparing coal gangue fine powder: crushing the coal gangue, then screening, and selecting particles with the particle size of less than 3 mm.
Preparing prepared concrete: mixing the fine coal gangue powder, the sulphoaluminate cement and the large-particle recycled aggregate, adding the additive, adding water, and stirring to obtain the prepared concrete. The mixture ratio of each component of the raw materials is as follows: 30 parts of coal gangue fine powder, 10 parts of sulphoaluminate cement, 30 parts of large-particle recycled aggregate, 2 parts of additive and 30 parts of water.
And (3) production and processing of the laminated plate: installing a stressed main rib, stretching the prestressed rib, and detecting stress; installing a lock rib plate and a template; binding distribution ribs; binding a lifting hook and installing an entrance to a cave embedded part. The main reinforcement interval should be even, and manual straightening is earlier in the installation, lets the initial condition of main reinforcement unanimous to guarantee that whole stretch-draw back, each steel wire stress deviation is in the allowed band. The prestressed steel wire adopts a one-time tensioning process, namely 0-1.03 sigma con, wherein sigma con is 0.8 fptk. After the main reinforcements are tensioned, actual tension stress of not less than 5 reinforcements is randomly inspected on each seat. The allowable deviation of the tensile stress is controlled within +/-5%.
Pouring the prepared concrete obtained in the step, uniformly paving the concrete on a beach, and vibrating to ensure that the concrete is compact, and has no bubbles and no honeycombs; the slump of the concrete is controlled to be 6 cm. And in the pouring, the depth of the scratches on the surface of the thin plate is not less than 4mm, and the concrete pouring is finished.
After the initial setting state is reached, removing the lock rib plate, and then maintaining; the maintenance adopts steam maintenance; the temperature rising speed is 28 ℃/h, the constant-temperature maintenance stage is carried out, the temperature is controlled to be 90 ℃, the heating can be stopped when the strength of the concrete test block meets the requirement, and after the heating is stopped, the thin plate is slowly cooled, so that the shrinkage crack of the concrete thin plate caused by temperature mutation is avoided.
When the strength of the test block cured under the same conditions reaches 75% of the designed compressive strength of the concrete cube, the prestressed reinforcement is released, then the reinforcement is sheared, the prestressed reinforcement is sheared, and the concrete is prestressed by means of the adhesion of the concrete and the prestressed reinforcement. Then the mould is removed, and the stack is lifted and piled.
Examples 5 to 7 are improved tests, in which the casting method is improved.
Example 5
Preparation of the additive: mixing 2 parts of expanded polystyrene foam particles, 1 part of sodium silicate and a coupling agent, adding 25 parts of acrylic emulsion, and stirring to obtain the acrylic emulsion.
Preparing large-particle recycled aggregate: the aggregate is prepared by crushing and screening waste concrete in construction waste, the particle size of the aggregate is controlled, and particles larger than 4.75mm are selected.
Preparing coal gangue fine powder: crushing the coal gangue, then screening, and selecting particles with the particle size of less than 3 mm.
Preparing the prepared concrete: mixing the fine coal gangue powder, the sulphoaluminate cement and the large-particle recycled aggregate, adding the additive, adding water, and stirring to obtain the prepared concrete. The mixture ratio of each component of the raw materials is as follows: 35 parts of coal gangue fine powder, 8 parts of sulphoaluminate cement, 28 parts of large-particle recycled aggregate, 3 parts of additive and 30 parts of water.
And (3) production and processing of the laminated plate: installing a stressed main rib, stretching the prestressed rib, and detecting stress; installing a lock rib plate and a template; binding distribution ribs; binding lifting hooks and installing hole embedded parts. The main reinforcement interval should be even, and manual straightening is earlier in the installation, lets the initial condition of main reinforcement unanimous to guarantee that whole stretch-draw back, each steel wire stress deviation is in the allowed band. The prestressed steel wire adopts a one-time tensioning process, namely 0-1.03 sigma con, wherein sigma con is 0.8 fptk. After the main reinforcements are tensioned, the actual tension stress of not less than 5 reinforcements is sampled and detected by each seat. The allowable deviation of the tensile stress is controlled within +/-5%.
Pouring the prepared concrete obtained in the steps, wherein the prepared concrete is added in three times, and the adding amount ratio of each time is as follows: 1:2:1, adding the prepared concrete for the first time, vibrating to compact the prepared concrete, pouring the prepared concrete for the second time after 30 minutes, and repeating the vibrating step; and after 30 minutes, pouring the prepared concrete for the third time, and repeating the vibrating step. The slump of the concrete is controlled to be 6 cm. And in the pouring, the depth of the scratches on the surface of the thin plate is not less than 4mm, and the concrete pouring is finished.
After the initial setting state is reached, removing the lock rib plate, and then maintaining; the maintenance adopts steam maintenance; the heating speed is 29 ℃/h, the constant-temperature curing stage is carried out, the temperature is controlled to be 85 ℃, the heating can be stopped when the strength of the concrete test block meets the requirement, and after the heating is stopped, the thin plate is slowly cooled, so that the thin plate of the concrete is prevented from generating shrinkage cracks due to temperature mutation.
When the strength of the test block cured under the same conditions reaches 75% of the designed compressive strength of the concrete cube, the prestressed reinforcement is released, then the reinforcement is sheared, the prestressed reinforcement is sheared, and the concrete is prestressed by means of the adhesion of the concrete and the prestressed reinforcement. Then the mould is removed, lifted and stacked.
Example 6
Preparation of the additive: mixing 3 parts of expanded polystyrene foam particles, 2 parts of sodium silicate and a coupling agent, adding 30 parts of acrylic emulsion, and stirring to obtain the acrylic emulsion.
Preparing large-particle recycled aggregate: aggregate prepared by crushing and screening waste concrete in construction waste, controlling the particle size of the aggregate and selecting particles larger than 4.75 mm.
Preparing coal gangue fine powder: crushing the coal gangue, then screening, and selecting particles with the particle size of less than 3 mm.
Preparing the prepared concrete: mixing the fine powder of the coal gangue, the sulphoaluminate cement and the large-particle recycled aggregate, adding the additive, adding water and stirring to obtain the prepared concrete. The mixture ratio of each component of the raw materials is as follows: 40 parts of coal gangue fine powder, 10 parts of sulphoaluminate cement, 30 parts of large-particle recycled aggregate, 5 parts of additive and 30 parts of water.
And (3) production and processing of the laminated plate: installing a stressed main rib, stretching the prestressed rib, and detecting stress; installing a lock rib plate and a template; binding distribution ribs; binding lifting hooks and installing hole embedded parts. The main reinforcement interval should be even, and manual straightening is earlier in the installation, lets the initial condition of main reinforcement unanimous to guarantee that whole stretch-draw back, each steel wire stress deviation is in the allowed band. The prestressed steel wire adopts a one-time tensioning process, namely 0-1.03 sigma con, wherein sigma con is 0.8 fptk. After the main reinforcements are tensioned, the actual tension stress of not less than 5 reinforcements is sampled and detected by each seat. The allowable deviation of the tensile stress is controlled within +/-5%.
Pouring the prepared concrete obtained in the steps, wherein the prepared concrete is added in three times, and the adding amount of each time is as follows: 1:2:1, adding the prepared concrete for the first time, vibrating to compact the prepared concrete, pouring the prepared concrete for the second time after 30 minutes, and repeating the vibrating step, wherein the prepared concrete has no bubbles and no honeycombs; and after 30 minutes, pouring the prepared concrete for the third time, and repeating the vibrating step. The slump of the concrete is controlled to be 6 cm. And in the pouring, the depth of the scratches on the surface of the thin plate is not less than 4mm, and the concrete pouring is finished.
After the initial setting state is reached, removing the lock rib plate, and then maintaining; the maintenance adopts steam maintenance; the temperature rising speed is 30 ℃/h, the constant-temperature maintenance stage is carried out, the temperature is controlled to be 90 ℃, the heating can be stopped when the strength of the concrete test block meets the requirement, and after the heating is stopped, the thin plate is slowly cooled, so that the thin plate of the concrete is prevented from generating shrinkage cracks due to temperature mutation.
When the strength of the test block cured under the same conditions reaches 75% of the designed compressive strength of the concrete cube, the prestressed reinforcement is released, then the reinforcement is sheared, the prestressed reinforcement is sheared, and the concrete is prestressed by means of the adhesion of the concrete and the prestressed reinforcement. Then the mould is removed, lifted and stacked.
Example 7
Preparation of the additive: mixing 1 part of expanded polystyrene foam particles, 1 part of sodium silicate and a coupling agent, adding 20 parts of acrylic emulsion, and stirring to obtain the acrylic emulsion.
Preparing large-particle recycled aggregate: the aggregate is prepared by crushing and screening waste concrete in construction waste, the particle size of the aggregate is controlled, and particles larger than 4.75mm are selected.
Preparing coal gangue fine powder: crushing the coal gangue, then screening, and selecting particles with the particle size of less than 3 mm.
Preparing the prepared concrete: mixing the fine coal gangue powder, the sulphoaluminate cement and the large-particle recycled aggregate, adding the additive, adding water, and stirring to obtain the prepared concrete. The mixture ratio of each component of the raw materials is as follows: 30 parts of coal gangue fine powder, 8 parts of sulphoaluminate cement, 25 parts of large-particle recycled aggregate, 2 parts of additive and 20 parts of water.
And (3) production and processing of the laminated plate: installing a stressed main rib, stretching the prestressed rib, and carrying out stress detection; installing a lock rib plate and a template; binding distribution ribs; binding lifting hooks and installing hole embedded parts. The main reinforcement interval should be even, and manual straightening is earlier in the installation, lets the initial condition of main reinforcement unanimous to guarantee that whole stretch-draw back, each steel wire stress deviation is in the allowed band. The prestressed steel wire adopts a one-time tensioning process, namely 0-1.03 sigma con, wherein sigma con is 0.8 fptk. After the main reinforcements are tensioned, the actual tension stress of not less than 5 reinforcements is sampled and detected by each seat. The allowable deviation of the tensile stress is controlled within +/-5%.
Pouring the prepared concrete obtained in the steps, wherein the prepared concrete is added in three times, and the adding amount ratio of each time is as follows: 1:2:1, adding the prepared concrete for the first time, vibrating to compact the prepared concrete, pouring the prepared concrete for the second time after 30 minutes, and repeating the vibrating step; and after 30 minutes, pouring prepared concrete for the third time, and repeating the vibrating step. The slump of the concrete is controlled to be 6 cm. And in the pouring, the depth of the scratches on the surface of the thin plate is not less than 4mm, and the concrete pouring is finished.
After the initial setting state is reached, removing the lock rib plate, and then maintaining; the maintenance adopts steam maintenance; the temperature rising speed is 28 ℃/h, the constant-temperature maintenance stage is carried out, the temperature is controlled to be 80 ℃, the heating can be stopped when the strength of the concrete test block meets the requirement, and after the heating is stopped, the thin plate is slowly cooled, so that the shrinkage crack of the concrete thin plate caused by temperature mutation is avoided.
When the strength of the test block cured under the same conditions reaches 75% of the designed compressive strength of the concrete cube, the prestressed reinforcement is released, then the reinforcement is sheared, the prestressed reinforcement is sheared, and the concrete is prestressed by means of the adhesion of the concrete and the prestressed reinforcement. Then the mould is removed, lifted and stacked.
Examples 8-10 to improve the experiments, additives were modified.
Example 8
Example 8 is the same as example 5 except for the following basic steps:
preparation of additive a: mixing 1 part of expanded polystyrene foam particles, 1 part of sodium silicate and a coupling agent, adding 20 parts of acrylic emulsion, and stirring to obtain the acrylic emulsion.
Preparation of additive b: mixing 1 part of expanded polystyrene foam particles, 1 part of sodium silicate and coupling agent, and 0.01-0.02 part of ammonium thiosulfate, adding 20 parts of acrylic emulsion, and stirring to obtain the acrylic emulsion.
Preparing the prepared concrete a: mixing the coal gangue fine powder, the sulphoaluminate cement and the large-particle recycled aggregate, adding the additive a, adding water, and stirring to obtain the prepared concrete. The mixture ratio of each component of the raw materials is as follows: 30 parts of coal gangue fine powder, 8 parts of sulphoaluminate cement, 25 parts of large-particle recycled aggregate, 2 parts of additive and 20 parts of water.
Preparing the prepared concrete b: and mixing the fine coal gangue powder, the sulphoaluminate cement and the large-particle recycled aggregate, adding the additive b, adding water, and stirring to obtain the prepared concrete. The mixture ratio of each component of the raw materials is as follows: 30 parts of coal gangue fine powder, 8 parts of sulphoaluminate cement, 25 parts of large-particle recycled aggregate, 2 parts of additive and 20 parts of water.
Pouring the prepared concrete obtained in the steps, wherein the prepared concrete is added in three times, and the adding amount ratio of each time is as follows: 1:2:1, adding the prepared concrete b for the first time, vibrating to compact the prepared concrete b, pouring the prepared concrete a for the second time after 30 minutes, and repeating the vibrating step; and after 30 minutes, pouring the prepared concrete b for the third time, and repeating the vibrating step. The slump of the concrete is controlled to be 6 cm. And in the pouring, the depth of the scratches on the surface of the thin plate is not less than 4mm, and the concrete pouring is finished.
Example 9
Example 9 is the same as example 6 in basic steps except that:
preparation of additive a: mixing 3 parts of expanded polystyrene foam particles, 2 parts of sodium silicate and a coupling agent, adding 30 parts of acrylic emulsion, and stirring to obtain the acrylic emulsion.
Preparation of additive b: mixing 3 parts of expanded polystyrene foam particles, 2 parts of sodium silicate and coupling agent, and 0.01-0.02 part of ammonium thiosulfate, adding 30 parts of acrylic emulsion, and stirring to obtain the acrylic emulsion.
Preparing the prepared concrete a: mixing the coal gangue fine powder, the sulphoaluminate cement and the large-particle recycled aggregate, adding the additive a, adding water, and stirring to obtain the prepared concrete. The mixture ratio of each component of the raw materials is as follows: 40 parts of coal gangue fine powder, 10 parts of sulphoaluminate cement, 30 parts of large-particle recycled aggregate, 5 parts of additive and 30 parts of water.
Preparing the prepared concrete b: and mixing the fine coal gangue powder, the sulphoaluminate cement and the large-particle recycled aggregate, adding the additive b, adding water, and stirring to obtain the prepared concrete. The mixture ratio of each component of the raw materials is as follows: 40 parts of coal gangue fine powder, 10 parts of sulphoaluminate cement, 30 parts of large-particle recycled aggregate, 5 parts of additive and 30 parts of water.
Pouring the prepared concrete obtained in the steps, wherein the prepared concrete is added in three times, and the adding amount ratio of each time is as follows: 1:2:1, adding the prepared concrete b for the first time, vibrating to enable the prepared concrete b to be compact and have no bubbles or honeycombs, pouring the prepared concrete a for the second time after 30 minutes, and repeating the vibrating step; and after 30 minutes, pouring the prepared concrete b for the third time, and repeating the vibrating step. The slump of the concrete is controlled to be 6 cm. And in the pouring, the depth of the scratches on the surface of the thin plate is not less than 4mm, and the concrete pouring is finished.
After the initial setting state is reached, removing the lock rib plate, and then maintaining; the maintenance adopts steam maintenance; the temperature rising speed is 30 ℃/h, the constant-temperature maintenance stage is carried out, the temperature is controlled to be 90 ℃, the heating can be stopped when the strength of the concrete test block meets the requirement, and after the heating is stopped, the thin plate is slowly cooled, so that the thin plate of the concrete is prevented from generating shrinkage cracks due to temperature mutation.
When the strength of the test block cured under the same conditions reaches 75% of the designed compressive strength of the concrete cube, the prestressed reinforcement is released, then the reinforcement is sheared, the prestressed reinforcement is sheared, and the concrete is prestressed by means of the adhesion of the concrete and the prestressed reinforcement. Then the mould is removed, lifted and stacked.
Example 10
Example 10 is the same as example 7 with the following basic steps:
preparation of additive a: mixing 2 parts of expanded polystyrene foam particles, 1 part of sodium silicate and a coupling agent, adding 25 parts of acrylic emulsion, and stirring to obtain the acrylic emulsion.
Preparation of additive b: mixing 2 parts of expanded polystyrene foam particles, 1 part of sodium silicate and coupling agent, and 0.01-0.02 part of ammonium thiosulfate, adding 25 parts of acrylic emulsion, and stirring to obtain the acrylic emulsion.
Preparing the prepared concrete a: mixing the coal gangue fine powder, the sulphoaluminate cement and the large-particle recycled aggregate, adding the additive a, adding water, and stirring to obtain the prepared concrete. The mixture ratio of each component of the raw materials is as follows: 35 parts of coal gangue fine powder, 8 parts of sulphoaluminate cement, 28 parts of large-particle recycled aggregate, 3 parts of additive and 30 parts of water.
Preparing the prepared concrete b: and mixing the fine coal gangue powder, the sulphoaluminate cement and the large-particle recycled aggregate, adding the additive b, adding water, and stirring to obtain the prepared concrete. The mixture ratio of each component of the raw materials is as follows: 35 parts of coal gangue fine powder, 8 parts of sulphoaluminate cement, 28 parts of large-particle recycled aggregate, 3 parts of additive and 30 parts of water.
Pouring the prepared concrete obtained in the steps, wherein the prepared concrete is added in three times, and the adding amount of each time is as follows: 1:2:1, adding the prepared concrete b for the first time, vibrating to compact the prepared concrete b, pouring the prepared concrete a for the second time after 30 minutes, and repeating the vibrating step; and after 30 minutes, pouring the prepared concrete b for the third time, and repeating the vibrating step. The slump of the concrete is controlled to be 6 cm. And in the pouring, the depth of the scratches on the surface of the thin plate is not less than 4mm, and the concrete pouring is finished.
In the laminated slab prepared by the method in examples 8 to 10, the raw materials and the additives contain S in different forms, and when the raw materials and the additives meet water, active chemical substances are formed and form water-insoluble crystal precipitates with free calcium in concrete, and the crystal precipitates diffuse in concrete pores under the action of water, so that S is replaced by more stable sulfite ions, metaaluminate ions and the like, and a complex and crystal precipitation reaction occurs to form a more stable compound to fill cracks and capillary pores in concrete, and the process is a continuous and cyclic process. Therefore, the laminated plate obtained by the schemes of the embodiments 8 to 10 further solves the problem that the conventional laminated plate has cracks. Meanwhile, the mechanical problem of the interface of the prefabricated part and the cast-in-place part is solved.
Example 11 to improve the test, the setting pattern of the cement was improved
Example 11
Preparation of the additive: mixing 2 parts of expanded polystyrene foam particles, 1 part of sodium silicate and a coupling agent, adding 25 parts of acrylic emulsion, and stirring to obtain the acrylic emulsion.
Preparing large-particle recycled aggregate: the aggregate is prepared by crushing and screening waste concrete in construction waste, the particle size of the aggregate is controlled, and particles larger than 4.75mm are selected.
Preparing coal gangue fine powder: crushing the coal gangue, then screening, and selecting particles with the particle size of less than 3 mm.
Preparing prepared concrete: mixing the fine coal gangue powder, the sulphoaluminate cement and the large-particle recycled aggregate, adding the additive, adding water, and stirring to obtain the prepared concrete. The mixture ratio of each component of the raw materials is as follows: 35 parts of coal gangue fine powder, 8 parts of sulphoaluminate cement, 28 parts of large-particle recycled aggregate, 3 parts of additive and 30 parts of water.
And (3) production and processing of the laminated plate: installing a stressed main rib, stretching the prestressed rib, and detecting stress; installing a lock rib plate and a template; binding distribution ribs; binding lifting hooks and installing hole embedded parts. The main reinforcement interval should be even, and manual straightening is earlier in the installation, lets the initial condition of main reinforcement unanimous to guarantee that whole stretch-draw back, each steel wire stress deviation is in the allowed band. The prestressed steel wire adopts a one-time tensioning process, namely 0-1.03 sigma con, wherein sigma con is 0.8 fptk. After the main reinforcements are tensioned, the actual tension stress of not less than 5 reinforcements is sampled and detected by each seat. The allowable deviation of the tensile stress is controlled within +/-5%.
Pouring the prepared concrete into a mould, wherein the initial state of the mould is not horizontal, the inclination angle between the bottom of the mould and the horizontal plane is 30 degrees, paving the concrete on a flat uniformly without overflowing, vibrating to compact the concrete, and reducing the inclination angle to 20 degrees, continuously adding the concrete, paving the concrete on the flat uniformly without overflowing, and repeating the vibrating step; then the inclination angle is reduced to 10 degrees, concrete is continuously added, and the concrete is uniformly paved on the beach without overflowing; repeating the vibrating step; then reducing the temperature to the level; the whole process is completed before the initial setting state is reached. The slump of the concrete is controlled to be 7 cm. And in the pouring, the depth of the scratches on the surface of the thin plate is not less than 4mm, and the concrete pouring is finished.
After the initial setting state is reached, removing the lock rib plate, and then maintaining; the maintenance adopts steam maintenance; the heating speed is 29 ℃/h, the constant-temperature curing stage is carried out, the temperature is controlled to be 85 ℃, the heating can be stopped when the strength of the concrete test block meets the requirement, and after the heating is stopped, the thin plate is slowly cooled, so that the thin plate of the concrete is prevented from generating shrinkage cracks due to temperature mutation.
When the strength of the test block cured under the same conditions reaches 75% of the designed compressive strength of the concrete cube, the prestressed reinforcement is released, then the reinforcement is sheared, the prestressed reinforcement is sheared, and the concrete is prestressed by means of the adhesion of the concrete and the prestressed reinforcement. Then the mould is removed, lifted and stacked.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application.
Claims (10)
1. The production and processing method of the green prestressed laminated slab is characterized by comprising the following steps of:
step 1, mixing the coal gangue fine powder, the sulphoaluminate cement and the large-particle recycled aggregate, adding an additive, adding water, and stirring to obtain prepared concrete;
step 2, installing a stressed main rib, stretching the prestressed rib, and performing stress detection; installing a lock rib plate and a template; binding distribution ribs; binding a lifting hook and installing an opening embedded part;
step 3, pouring the prepared concrete obtained in the step 1 into a mould, uniformly paving the concrete on a beach, and vibrating to compact the concrete without bubbles and honeycombs; after the initial setting state is reached, removing the lock rib plate, and then maintaining;
and 4, when the strength of the test block cured under the same conditions reaches 75% of the designed compressive strength of the concrete cube, releasing and tensioning the prestressed tendons, shearing the tendons, removing the mold, and lifting and stacking.
2. The method for producing and processing green prestressed composite slabs according to claim 1, wherein in step 1, the coal gangue fine powder is selected to have a particle size of less than 3mm by controlling the particle size of the coal gangue fine powder; the aggregate is prepared by crushing and screening waste concrete in the construction waste for the large-particle recycled aggregate, the particle size of the aggregate is controlled, and particles larger than 4.75mm are selected.
3. The method for producing and processing the green prestressed composite slab as claimed in claim 1, wherein in step 1, the raw materials comprise the following components in parts by weight: 30-40 parts of coal gangue fine powder, 8-10 parts of sulphoaluminate cement, 25-30 parts of large-particle recycled aggregate, 2-5 parts of additive and 20-30 parts of water.
4. The method for producing and processing the green prestressed composite slab as claimed in claim 1, wherein in step 1, the additive is obtained by mixing 1-3 parts of expanded polystyrene foam particles, 1-2 parts of sodium silicate and a coupling agent, and then adding 20-30 parts of acrylic emulsion and stirring.
5. The method for producing and processing the green prestressed composite slab as claimed in claim 1, wherein in step 3, the slump of the concrete is controlled to be 6-8 cm; and in the pouring, the depth of the scratches on the surface of the thin plate is not less than 4mm, and the concrete pouring is finished.
6. The method for producing a green prestressed composite slab as claimed in claim 1, wherein in step 3, said curing is performed by steam curing; the temperature rising speed is 28-30 ℃/h, the constant-temperature curing stage is carried out, the temperature is controlled to be 80-90 ℃, the heating can be stopped when the strength of the concrete test block meets the requirement, and after the heating is stopped, the thin plate is slowly cooled, so that the concrete thin plate is prevented from generating shrinkage cracks due to temperature mutation.
7. The method for producing and processing the green prestressed composite slab as claimed in claim 1, wherein the prestressed reinforcement is sheared after the strength of the concrete sample reaches 70-75% of standard strength.
8. The method for producing and processing green prestressed composite slab as claimed in claim 1, wherein in step 3, said prepared concrete is added in three times, and the ratio of the addition amount of each time is: 1:2:1, and the time interval of each addition is 30-45 minutes.
9. The method for producing and processing green prestressed composite slab as claimed in claim 8, wherein in step 3, prepared concrete is added and vibrated to make it compact without air bubbles and honeycomb, and after 30 minutes, the prepared concrete is poured and the vibrating step is repeated; after 30 minutes, pouring the prepared concrete again, repeating the vibrating step, wherein the proportions of the prepared concrete added for three times are as follows: 1:2: 1.
10. the method for producing and processing the green prestressed composite slab as claimed in claim 8, wherein the additive is obtained by mixing 1-3 parts of expanded polystyrene foam particles, 1-2 parts of sodium silicate, 0.01-0.02 part of ammonium thiosulfate and a coupling agent, and then adding 20-30 parts of acrylic emulsion and stirring.
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