CN111704417B - Preparation method of ultrahigh-strength concrete - Google Patents
Preparation method of ultrahigh-strength concrete Download PDFInfo
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- CN111704417B CN111704417B CN202010702616.9A CN202010702616A CN111704417B CN 111704417 B CN111704417 B CN 111704417B CN 202010702616 A CN202010702616 A CN 202010702616A CN 111704417 B CN111704417 B CN 111704417B
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- 239000004567 concrete Substances 0.000 title claims abstract description 42
- 238000002360 preparation method Methods 0.000 title claims abstract description 24
- 239000000835 fiber Substances 0.000 claims abstract description 82
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 63
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 43
- KDYFGRWQOYBRFD-UHFFFAOYSA-N succinic acid Chemical compound OC(=O)CCC(O)=O KDYFGRWQOYBRFD-UHFFFAOYSA-N 0.000 claims abstract description 42
- 238000003756 stirring Methods 0.000 claims abstract description 38
- LXCFILQKKLGQFO-UHFFFAOYSA-N methylparaben Chemical compound COC(=O)C1=CC=C(O)C=C1 LXCFILQKKLGQFO-UHFFFAOYSA-N 0.000 claims abstract description 32
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 30
- 238000001035 drying Methods 0.000 claims abstract description 30
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims abstract description 28
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims abstract description 27
- 239000011398 Portland cement Substances 0.000 claims abstract description 26
- 150000001875 compounds Chemical class 0.000 claims abstract description 22
- 239000004576 sand Substances 0.000 claims abstract description 22
- LDVVTQMJQSCDMK-UHFFFAOYSA-N 1,3-dihydroxypropan-2-yl formate Chemical compound OCC(CO)OC=O LDVVTQMJQSCDMK-UHFFFAOYSA-N 0.000 claims abstract description 21
- 239000010881 fly ash Substances 0.000 claims abstract description 21
- 239000001384 succinic acid Substances 0.000 claims abstract description 21
- 239000011372 high-strength concrete Substances 0.000 claims abstract description 18
- 239000002994 raw material Substances 0.000 claims abstract description 17
- 238000010438 heat treatment Methods 0.000 claims abstract description 16
- 235000010270 methyl p-hydroxybenzoate Nutrition 0.000 claims abstract description 16
- 239000004292 methyl p-hydroxybenzoate Substances 0.000 claims abstract description 16
- 229960002216 methylparaben Drugs 0.000 claims abstract description 16
- 239000002131 composite material Substances 0.000 claims abstract description 14
- 238000005520 cutting process Methods 0.000 claims abstract description 8
- 238000002156 mixing Methods 0.000 claims abstract description 8
- 238000002791 soaking Methods 0.000 claims abstract description 8
- 238000005406 washing Methods 0.000 claims abstract description 8
- SNRUBQQJIBEYMU-UHFFFAOYSA-N Dodecane Natural products CCCCCCCCCCCC SNRUBQQJIBEYMU-UHFFFAOYSA-N 0.000 claims abstract description 6
- MTHSVFCYNBDYFN-UHFFFAOYSA-N diethylene glycol Chemical compound OCCOCCO MTHSVFCYNBDYFN-UHFFFAOYSA-N 0.000 claims abstract description 6
- 125000003438 dodecyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])* 0.000 claims abstract description 6
- -1 polytetrafluoroethylene Polymers 0.000 claims description 14
- 238000000034 method Methods 0.000 claims description 12
- 238000005303 weighing Methods 0.000 claims description 9
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims description 7
- 238000001816 cooling Methods 0.000 claims description 7
- 238000002074 melt spinning Methods 0.000 claims description 7
- 230000006855 networking Effects 0.000 claims description 7
- 229920000728 polyester Polymers 0.000 claims description 7
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 7
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 7
- 229910052708 sodium Inorganic materials 0.000 claims description 7
- 239000011734 sodium Substances 0.000 claims description 7
- 229940104261 taurate Drugs 0.000 claims description 7
- 238000004804 winding Methods 0.000 claims description 7
- 230000001476 alcoholic effect Effects 0.000 claims description 6
- BBMCTIGTTCKYKF-UHFFFAOYSA-N 1-heptanol Chemical compound CCCCCCCO BBMCTIGTTCKYKF-UHFFFAOYSA-N 0.000 claims description 4
- GVGUFUZHNYFZLC-UHFFFAOYSA-N dodecyl benzenesulfonate;sodium Chemical compound [Na].CCCCCCCCCCCCOS(=O)(=O)C1=CC=CC=C1 GVGUFUZHNYFZLC-UHFFFAOYSA-N 0.000 claims description 3
- 229940080264 sodium dodecylbenzenesulfonate Drugs 0.000 claims description 3
- 229920005552 sodium lignosulfonate Polymers 0.000 claims description 3
- 239000002202 Polyethylene glycol Substances 0.000 claims description 2
- 229920001223 polyethylene glycol Polymers 0.000 claims description 2
- 230000003014 reinforcing effect Effects 0.000 claims 1
- 239000004568 cement Substances 0.000 abstract description 15
- 230000007613 environmental effect Effects 0.000 abstract 1
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 20
- 230000000052 comparative effect Effects 0.000 description 10
- 238000004519 manufacturing process Methods 0.000 description 10
- DWHIUNMOTRUVPG-UHFFFAOYSA-N 2-[2-[2-[2-[2-[2-(2-dodecoxyethoxy)ethoxy]ethoxy]ethoxy]ethoxy]ethoxy]ethanol Chemical compound CCCCCCCCCCCCOCCOCCOCCOCCOCCOCCOCCO DWHIUNMOTRUVPG-UHFFFAOYSA-N 0.000 description 9
- 239000002956 ash Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 3
- 230000002411 adverse Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000011150 reinforced concrete Substances 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/0048—Fibrous materials
- C04B20/0068—Composite fibres, e.g. fibres with a core and sheath of different material
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/02—Treatment
- C04B20/023—Chemical treatment
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
- C04B2201/52—High compression strength concretes, i.e. with a compression strength higher than about 55 N/mm2, e.g. reactive powder concrete [RPC]
-
- 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
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Composite Materials (AREA)
- Inorganic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention provides a preparation method of ultra-high strength concrete, which comprises the following steps: s1, soaking the sea-island fiber in a sodium hydroxide solution, heating, taking out the sea-island fiber, washing with water, drying to obtain a pretreated sea-island fiber, cutting the pretreated sea-island fiber to obtain pretreated sea-island short fiber, adding methyl paraben and dodecyl heptapolyethylene glycol ether into an alcohol solution, mixing uniformly, adding the pretreated sea-island short fiber, heating, taking out and drying to obtain the reinforced composite; s2, preparing a concrete raw material; s3, stirring the ordinary portland cement, the reinforced compound and water uniformly, adding the succinic acid monoglyceride and the fly ash, continuing stirring, and then sequentially adding the diatomite, the standard sand and the water reducing agent to obtain the ultra-high strength concrete. The preparation method provided by the invention is simple to operate, and the prepared concrete has the advantages of high strength, excellent comprehensive performance, small cement consumption and environmental friendliness.
Description
Technical Field
The invention relates to the technical field of high-rise building materials, in particular to a preparation method of ultrahigh-strength concrete.
Background
With the rising of more and more high buildings, in order to improve the space utilization rate of the land per unit area, the height of the building is higher and higher, the newly built building at present usually adopts a floor structure with dozens of floors, twenty-few floors or even higher, and the buildings with multiple floors (6 floors or below) are rarely seen. With the increase of the floors of the building, the requirements of the building engineers on the building auxiliary materials are higher and higher. At present, a high-rise building mainly adopts a reinforced concrete structure, has higher requirements on the structure of concrete, generally needs ultrahigh strength grade, and the traditional solution is to increase the proportion of cement in the concrete. On one hand, the use amount of cement is increased, so that a large amount of cement ash is generated in the preparation process of the concrete, and adverse effects are caused to operators and the environment; on the other hand, the increase of the cement usage amount can generate huge production pressure for cement production plants; on the other hand, the increase of the proportion of cement in concrete increases the cost of concrete production and the cost of construction. Moreover, the strength of the concrete commonly used for the high-rise building at present is difficult to reach more than 120 MPa. Based on the method, the invention provides a preparation method of the ultra-high strength concrete.
Disclosure of Invention
The invention aims to solve the problems that the strength of the existing concrete for high-rise buildings is difficult to reach more than 120MPa, the proportion of cement in the high-strength concrete is large, the production cost of the concrete is high, the building cost is high, cement ash in the production process of the concrete is large, the operator and the environment are adversely affected, and huge production pressure is generated for cement production plants.
In order to achieve the purpose, the invention is realized by the following technical scheme:
a preparation method of ultra-high strength concrete comprises the following steps:
s1, preparation of reinforced compound: soaking the sea-island fiber in 0.5mol/L sodium hydroxide solution, heating to 80-90 ℃, treating for 20-30 min, taking out the sea-island fiber, washing with 50-60 ℃ water for 15-20 min, drying to obtain pretreated sea-island fiber, cutting the pretreated sea-island fiber into 3-4 mm pieces to obtain pretreated sea-island short fiber for later use, adding methyl paraben and dodecyl hepta-polyethylene glycol ether into the alcohol solution, mixing uniformly, adding the prepared pretreated sea-island short fiber, heating to 40-50 ℃, treating for 30min, taking out the pretreated sea-island fiber, and drying to obtain the reinforced composite;
s2, preparing concrete raw materials: weighing 230-252 parts of ordinary portland cement, 15-23 parts of reinforced compound, 20-30 parts of fly ash, 600-700 parts of standard sand, 50-70 parts of diatomite, 2-5 parts of water reducing agent, 0.8-1.6 parts of succinic acid monoglyceride and 180-200 parts of water for later use;
s3, uniformly stirring the ordinary portland cement, the reinforced compound and the water prepared in the step S2, adding the succinic acid monoglyceride and the fly ash prepared in the step S2, continuously stirring for 3-5 min, sequentially adding the diatomite, the standard sand and the water reducing agent, and continuously stirring for 3-5 min to obtain the ultrahigh-strength concrete.
Preferably, the sea component of the sea-island fiber is polyester, the island component is polytetrafluoroethylene, and the sea-island fiber is prepared by the following method: the sea component and the island component are mixed by a metering pump according to the mass ratio of 4: 4-5, performing melt spinning to obtain the island nascent fiber, and then cooling, drying, drafting, drying, networking, oiling and winding to obtain the island fiber.
Preferably, the alcohol solution is prepared from a mixture of 100: 3-6: 10-14 parts of ethanol, heptanol and water.
Preferably, the adding mass of the methyl paraben is 3-8% of the mass of the alcoholic solution, the adding mass of the dodecyl heptapoly glycol ether is 6-16% of the mass of the alcoholic solution, and further preferably, the adding mass of the methyl paraben is 5% of the mass of the alcoholic solution, and the adding mass of the dodecyl heptapoly glycol ether is 10% of the mass of the alcoholic solution.
Preferably, the concrete raw materials comprise 240 parts of ordinary portland cement, 18 parts of reinforced composite, 25 parts of fly ash, 640 parts of standard sand, 58 parts of diatomite, 4 parts of water reducing agent, 1.1 parts of succinic acid monoglyceride and 190 parts of water.
Preferably, the water reducing agent is one of sodium lignosulfonate, sodium dodecyl benzene sulfonate and sodium cocoyl methyl taurate.
Preferably, the stirring speed is 250-300 r/min.
Compared with the prior art, the adhesive provided by the invention has the advantages that:
1. the preparation method provided by the invention is simple to operate, cheap and easily-obtained ordinary portland cement, standard sand and water are used as main raw materials to endow the concrete with basic bonding characteristics, but the proportion of the portland cement in the components is low, and the comprehensive performance of the concrete is not ideal.
2. The ratio of the portland cement to water in the concrete formula provided by the invention is only 1.15-1.4: 1, far lower than the corresponding proportion in the traditional high-strength concrete, obviously reduces the using amount of cement, not only reduces the production pressure of a cement plant, but also reduces the harm of cement ash to operators and the environment, and is more environment-friendly.
3. The reinforced compound and the succinic acid monoglyceride are added, so that the strength of concrete is enhanced, a certain adsorption effect on cement ash of ordinary portland cement can be generated, further, the cement ash scattering in the production process is reduced, the production safety is further improved, the safety of operators is ensured, and the pollution to the environment is reduced.
4. The reinforced composite used by the invention takes sea island fibers as main materials, is treated by sodium hydroxide solution, and can be quickly combined with succinic acid monoglyceride and ordinary portland cement after being modified by methyl paraben and dodecyl heptaglycol ether, thereby achieving the effect of improving the compressive strength and the breaking strength of concrete.
Detailed Description
The present invention will be further illustrated with reference to the following specific examples.
Example 1
The invention provides a preparation method of ultra-high strength concrete, which comprises the following steps:
s1, preparation of reinforced compound: soaking the sea-island fiber in 0.5mol/L sodium hydroxide solution, heating to 80 ℃, treating for 30min, taking out the sea-island fiber, washing for 20min by using water at 50 ℃, drying to obtain pretreated sea-island fiber, cutting the pretreated sea-island fiber into 3-4 mm to obtain pretreated sea-island short fiber for later use, adding methyl paraben and dodecyl heptaglycol ether into an alcohol solution, wherein the mass of the methyl paraben is 3% of the mass of the alcohol solution, the mass of the dodecyl heptaglycol ether is 6% of the mass of the alcohol solution, and the volume ratio of the alcohol solution is 100: 3: 10, mixing uniformly, adding the standby pretreated island short fibers, heating to 40 ℃, treating for 30min, taking out the pretreated island fibers, and drying to obtain the reinforced composite;
the sea-island fiber is prepared from polyester as a sea component and polytetrafluoroethylene as an island component by the following method: the sea component and the island component are mixed by a metering pump according to the mass ratio of 4: 4, performing melt spinning to obtain island nascent fibers, and then cooling, drying, drafting, drying, networking, oiling and winding to obtain the island fibers;
s2, preparing concrete raw materials: weighing 230 parts of ordinary portland cement, 23 parts of reinforced composite, 30 parts of fly ash, 600 parts of standard sand, 70 parts of diatomite, 2 parts of water reducing agent, 1.6 parts of succinic acid monoglyceride and 200 parts of water, wherein the water reducing agent is sodium lignosulfonate for later use;
s3, uniformly stirring the ordinary portland cement, the reinforced compound and the water prepared in the step S2, adding the succinic acid monoglyceride and the fly ash prepared in the step S2, continuously stirring for 5min, sequentially adding the diatomite, the standard sand and the water reducing agent, and continuously stirring for 3min to obtain the ultrahigh-strength concrete.
In the present invention, the stirring speed is 250 r/min.
Example 2
The invention provides a preparation method of ultra-high strength concrete, which comprises the following steps:
s1, preparation of reinforced compound: soaking the sea-island fiber in 0.5mol/L sodium hydroxide solution, heating to 85 ℃, treating for 25min, taking out the sea-island fiber, washing for 20min with water at 55 ℃, drying to obtain pretreated sea-island fiber, cutting the pretreated sea-island fiber into 3-4 mm to obtain pretreated sea-island short fiber for later use, adding methyl paraben and dodecyl heptaglycol ether into an alcohol solution, wherein the adding mass of the methyl paraben is 5 percent of the mass of the alcohol solution, the adding mass of the dodecyl heptaglycol ether is 10 percent of the mass of the alcohol solution, and the volume ratio of the alcohol solution is 100: 5: 12, uniformly mixing, adding the standby pretreated sea-island short fibers, heating to 50 ℃, treating for 30min, taking out the pretreated sea-island fibers, and drying to obtain the reinforced composite;
the sea-island fiber is prepared from polyester as a sea component and polytetrafluoroethylene as an island component by the following method: the sea component and the island component are mixed by a metering pump according to the mass ratio of 4: 5, performing melt spinning to obtain island nascent fibers, and then cooling, drying, drafting, drying, networking, oiling and winding to obtain the island fibers;
s2, preparing concrete raw materials: weighing the raw materials according to 240 parts of ordinary portland cement, 18 parts of reinforced compound, 25 parts of fly ash, 640 parts of standard sand, 58 parts of diatomite, 4 parts of water reducing agent, 1.1 parts of succinic acid monoglyceride and 190 parts of water, wherein the water reducing agent is sodium cocoyl methyl taurate for later use;
s3, uniformly stirring the ordinary portland cement, the reinforced compound and the water prepared in the step S2, adding the succinic acid monoglyceride and the fly ash prepared in the step S2, continuously stirring for 5min, sequentially adding the diatomite, the standard sand and the water reducing agent, and continuously stirring for 5min to obtain the ultrahigh-strength concrete.
In the present invention, the stirring speed is 300 r/min.
Example 3
The invention provides a preparation method of ultra-high strength concrete, which comprises the following steps:
s1, preparation of reinforced compound: soaking the sea-island fiber in 0.5mol/L sodium hydroxide solution, heating to 90 ℃, treating for 20min, taking out the sea-island fiber, washing for 15min by using water at 60 ℃, drying to obtain pretreated sea-island fiber, cutting the pretreated sea-island fiber into 3-4 mm to obtain pretreated sea-island short fiber for later use, adding methyl paraben and dodecyl heptaglycol ether into an alcohol solution, wherein the mass of the methyl paraben is 8% of the mass of the alcohol solution, the mass of the dodecyl heptaglycol ether is 16% of the mass of the alcohol solution, and the volume ratio of the alcohol solution is 100: 6: 14, uniformly mixing, adding the standby pretreated sea-island short fibers, heating to 50 ℃, treating for 30min, taking out the pretreated sea-island fibers, and drying to obtain the reinforced composite;
the sea-island fiber is prepared from polyester as a sea component and polytetrafluoroethylene as an island component by the following method: the sea component and the island component are mixed by a metering pump according to the mass ratio of 4: 5, performing melt spinning to obtain island nascent fibers, and then cooling, drying, drafting, drying, networking, oiling and winding to obtain the island fibers;
s2, preparing concrete raw materials: weighing 252 parts of ordinary portland cement, 15 parts of reinforced composite, 20 parts of fly ash, 700 parts of standard sand, 50 parts of diatomite, 5 parts of water reducing agent, 0.8 part of succinic acid monoglyceride and 180 parts of water, wherein the water reducing agent is sodium dodecyl benzene sulfonate for later use;
s3, uniformly stirring the ordinary portland cement, the reinforced compound and the water prepared in the step S2, adding the succinic acid monoglyceride and the fly ash prepared in the step S2, continuously stirring for 3min, sequentially adding the diatomite, the standard sand and the water reducing agent, and continuously stirring for 5min to obtain the ultrahigh-strength concrete.
In the present invention, the stirring speed is 300 r/min.
Comparative example 1
The invention provides a preparation method of ultra-high strength concrete, which comprises the following steps:
s1, preparation of reinforced compound: soaking the sea-island fiber in 0.5mol/L sodium hydroxide solution, heating to 85 ℃, treating for 25min, taking out the sea-island fiber, washing with 55 ℃ water for 20min, drying to obtain pretreated sea-island fiber, cutting the pretreated sea-island fiber into 3-4 mm to obtain pretreated sea-island short fiber, adding the pretreated sea-island short fiber into an alcohol solution, wherein the volume ratio of the alcohol solution to the alcohol solution is 100: 5: 12, uniformly mixing, heating to 50 ℃, treating for 30min, taking out the pretreated sea-island fibers, and drying to obtain the reinforced composite;
wherein, the sea component of the sea-island fiber is polyester, the island component is polytetrafluoroethylene, and the sea-island fiber is prepared by the following method: the sea component and the island component are mixed by a metering pump according to the mass ratio of 4: 5, performing melt spinning to obtain island nascent fibers, and then cooling, drying, drafting, drying, networking, oiling and winding to obtain the island fibers;
s2, preparing concrete raw materials: weighing the raw materials according to 240 parts of ordinary portland cement, 18 parts of reinforced compound, 25 parts of fly ash, 640 parts of standard sand, 58 parts of diatomite, 4 parts of water reducing agent, 1.1 parts of succinic acid monoglyceride and 190 parts of water, wherein the water reducing agent is sodium cocoyl methyl taurate for later use;
s3, uniformly stirring the ordinary portland cement, the reinforced compound and the water prepared in the step S2, adding the succinic acid monoglyceride and the fly ash prepared in the step S2, continuously stirring for 5min, sequentially adding the diatomite, the standard sand and the water reducing agent, and continuously stirring for 5min to obtain the ultrahigh-strength concrete.
In the present invention, the stirring speed is 300 r/min.
Comparative example 2
The invention provides a preparation method of ultra-high strength concrete, which comprises the following steps:
s1, preparing concrete raw materials: weighing 240 parts of ordinary portland cement, 25 parts of fly ash, 640 parts of standard sand, 58 parts of diatomite, 4 parts of a water reducing agent and 190 parts of water, wherein the water reducing agent is sodium cocoyl methyl taurate for later use;
and S2, uniformly stirring the ordinary portland cement prepared in the step S1 and water, adding the fly ash prepared in the step S1, continuously stirring for 5min, sequentially adding the diatomite, the standard sand and the water reducing agent, and continuously stirring for 5min to obtain the ultrahigh-strength concrete.
In the present invention, the stirring speed is 300 r/min.
Comparative example 3
The invention provides a preparation method of ultra-high strength concrete, which comprises the following steps:
s1, preparing concrete raw materials: weighing the raw materials according to 240 parts of ordinary portland cement, 25 parts of fly ash, 640 parts of standard sand, 58 parts of diatomite, 4 parts of a water reducing agent, 1.1 parts of succinic acid monoglyceride and 190 parts of water, wherein the water reducing agent is sodium cocoyl methyl taurate for later use;
s2, uniformly stirring the ordinary portland cement prepared in the step S1 and water, adding the succinic acid monoglyceride and the fly ash prepared in the step S1, continuously stirring for 5min, sequentially adding the diatomite, the standard sand and the water reducing agent, and continuously stirring for 5min to obtain the ultra-high strength concrete.
In the present invention, the stirring speed is 300 r/min.
Comparative example 4
The invention provides a preparation method of ultra-high strength concrete, which comprises the following steps:
s1, preparation of reinforced compound: soaking the sea-island fiber in 0.5mol/L sodium hydroxide solution, heating to 85 ℃, treating for 25min, taking out the sea-island fiber, washing for 20min by using 55 ℃ water, drying to obtain pretreated sea-island fiber, cutting the pretreated sea-island fiber into 3-4 mm to obtain pretreated sea-island short fiber for later use, adding methyl paraben and dodecyl heptaglycol ether into an alcohol solution, wherein the mass of the methyl paraben is 5% of the mass of the alcohol solution, the mass of the dodecyl heptaglycol ether is 10% of the mass of the alcohol solution, and the volume ratio of the alcohol solution is 100: 5: 12, uniformly mixing, adding the standby pretreated sea-island short fibers, heating to 50 ℃, treating for 30min, taking out the pretreated sea-island fibers, and drying to obtain the reinforced composite;
wherein, the sea component of the sea-island fiber is polyester, the island component is polytetrafluoroethylene, and the sea-island fiber is prepared by the following method: the sea component and the island component are mixed by a metering pump according to the mass ratio of 4: 5, performing melt spinning to obtain island nascent fibers, and then cooling, drying, drafting, drying, networking, oiling and winding to obtain the island fibers;
s2, preparing concrete raw materials: weighing the raw materials according to 240 parts of ordinary portland cement, 18 parts of reinforced compound, 25 parts of fly ash, 640 parts of standard sand, 58 parts of diatomite, 4 parts of water reducing agent and 190 parts of water, wherein the water reducing agent is sodium cocoyl methyl taurate for later use;
s3, uniformly stirring the ordinary Portland cement, the reinforced compound and the water prepared in the step S2, adding the fly ash prepared in the step S2, continuously stirring for 5min, sequentially adding the diatomite, the standard sand and the water reducing agent, and continuously stirring for 5min to obtain the ultra-high-strength concrete.
In the present invention, the stirring speed is 300 r/min.
The performance of the concrete prepared in the examples 1-3 is detected by referring to JGJ/T281-.
Table 1:
table 1 the test results show: the concrete prepared in the embodiments 1 to 3 has the advantages that the expansion degree can reach more than 700mm, the emptying time of the inverted slump cone is 7 to 8s, the compressive strength can reach more than 120MPa after curing for 7d, the breaking strength can reach more than 15MPa, the compressive strength can reach more than 135MPa after curing for 28d, and the breaking strength can reach more than 20 MPa.
The concrete prepared in the comparative examples 1-4 is subjected to performance detection by referring to the GB/T50081-2019 standard, and the results are shown in Table 2.
Table 2:
| performance index | Comparative example 1 | Comparative example 2 | Comparative example 3 | Comparative example 4 |
| 7d compressive strength/MPa | 119.4 | 93.2 | 100.5 | 107.6 |
| 28d compressive strength/MPa | 132.3 | 110.6 | 116.9 | 124.5 |
| 7d flexural strength/MPa | 15.6 | 10.1 | 11.7 | 13.4 |
| 28d flexural strength/MPa | 19.7 | 13.7 | 15.5 | 16.9 |
Table 2 comparing the test results with the results of example 2, the compressive strength and the flexural strength after curing for 7d and 28d of comparative examples are both significantly lower than those of example 2, which shows that the modification of sea island fiber by methylparaben and dodecylheptapolyglycol ether in the concrete of the present invention and the addition of the reinforced composite and succinic acid monoglyceride all promote the strength of the concrete, and the reinforced composite and succinic acid monoglyceride also have synergistic effect.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (5)
1. The preparation method of the ultra-high-strength concrete is characterized by comprising the following steps of:
s1, preparation of reinforced compound: soaking the sea-island fiber in 0.5mol/L sodium hydroxide solution, heating to 80-90 ℃, treating for 20-30 min, taking out the sea-island fiber, washing with 50-60 ℃ water for 15-20 min, drying to obtain pretreated sea-island fiber, cutting the pretreated sea-island fiber into 3-4 mm pieces to obtain pretreated sea-island short fiber for later use, adding methyl paraben and dodecyl hepta-polyethylene glycol ether into the alcohol solution, mixing uniformly, adding the prepared pretreated sea-island short fiber, heating to 40-50 ℃, treating for 30min, taking out the pretreated sea-island fiber, and drying to obtain the reinforced composite;
the sea component of the sea-island fiber is polyester, the island component is polytetrafluoroethylene, and the sea-island fiber is prepared by the following method: the sea component and the island component are mixed by a metering pump according to the mass ratio of 4: 4-5, performing melt spinning to obtain island nascent fibers, and cooling, drying, drafting, drying, networking, oiling and winding to obtain the island fibers;
the adding mass of the methyl paraben is 3-8% of the mass of the alcoholic solution, and the adding mass of the dodecyl heptapolyethylene glycol ether is 6-16% of the mass of the alcoholic solution;
s2, preparing concrete raw materials: weighing 230-252 parts of ordinary portland cement, 15-23 parts of reinforced compound, 20-30 parts of fly ash, 600-700 parts of standard sand, 50-70 parts of diatomite, 2-5 parts of water reducing agent, 0.8-1.6 parts of succinic acid monoglyceride and 180-200 parts of water for later use;
s3, uniformly stirring the ordinary portland cement, the reinforced compound and the water prepared in the step S2, adding the succinic acid monoglyceride and the fly ash prepared in the step S2, continuously stirring for 3-5 min, sequentially adding the diatomite, the standard sand and the water reducing agent, and continuously stirring for 3-5 min to obtain the ultrahigh-strength concrete.
2. The method of claim 1, wherein the alcohol solution is prepared from the following components in a volume ratio of 100: 3-6: 10-14 parts of ethanol, heptanol and water.
3. The method for preparing the ultra-high strength concrete according to claim 1, wherein the concrete raw materials comprise 240 parts of ordinary portland cement, 18 parts of a reinforcing compound, 25 parts of fly ash, 640 parts of standard sand, 58 parts of diatomite, 4 parts of a water reducing agent, 1.1 parts of succinic acid monoglyceride and 190 parts of water.
4. The method of claim 1 or 3, wherein the water reducing agent is one of sodium lignosulfonate, sodium dodecylbenzene sulfonate and sodium cocoyl methyl taurate.
5. The method for preparing the ultra-high strength concrete according to claim 1, wherein the stirring speed is 250-300 r/min.
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| JPH09268467A (en) * | 1996-03-29 | 1997-10-14 | Kuraray Co Ltd | Polyvinyl alcohol heat resistant fiber |
| US6844065B2 (en) * | 2001-12-27 | 2005-01-18 | Dow Global Technologies, Inc. | Plastic fibers for improved concrete |
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| CN105297161B (en) * | 2015-09-22 | 2018-06-29 | 四川大学 | It is a kind of using water soluble polyurethane elastomer as the sea-island fibre decrement method in a mild condition in sea |
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