CN111003971A - Low-slump loss concrete and preparation method thereof - Google Patents
Low-slump loss concrete and preparation method thereof Download PDFInfo
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- CN111003971A CN111003971A CN201910944314.XA CN201910944314A CN111003971A CN 111003971 A CN111003971 A CN 111003971A CN 201910944314 A CN201910944314 A CN 201910944314A CN 111003971 A CN111003971 A CN 111003971A
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- 239000004567 concrete Substances 0.000 title claims abstract description 67
- 238000002360 preparation method Methods 0.000 title claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 53
- UFWIBTONFRDIAS-UHFFFAOYSA-N Naphthalene Chemical compound C1=CC=CC2=CC=CC=C21 UFWIBTONFRDIAS-UHFFFAOYSA-N 0.000 claims abstract description 50
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 43
- 239000002893 slag Substances 0.000 claims abstract description 17
- 239000004568 cement Substances 0.000 claims abstract description 16
- 239000004576 sand Substances 0.000 claims abstract description 11
- 239000004927 clay Substances 0.000 claims abstract description 9
- 239000004575 stone Substances 0.000 claims abstract description 5
- 239000002904 solvent Substances 0.000 claims abstract description 3
- 238000002156 mixing Methods 0.000 claims description 31
- 238000003756 stirring Methods 0.000 claims description 31
- 239000000835 fiber Substances 0.000 claims description 21
- 239000003607 modifier Substances 0.000 claims description 20
- OZAIFHULBGXAKX-UHFFFAOYSA-N 2-(2-cyanopropan-2-yldiazenyl)-2-methylpropanenitrile Chemical compound N#CC(C)(C)N=NC(C)(C)C#N OZAIFHULBGXAKX-UHFFFAOYSA-N 0.000 claims description 16
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 claims description 16
- 239000000203 mixture Substances 0.000 claims description 16
- 239000003365 glass fiber Substances 0.000 claims description 15
- DGVVJWXRCWCCOD-UHFFFAOYSA-N naphthalene;hydrate Chemical compound O.C1=CC=CC2=CC=CC=C21 DGVVJWXRCWCCOD-UHFFFAOYSA-N 0.000 claims description 15
- 229920006306 polyurethane fiber Polymers 0.000 claims description 15
- 238000010438 heat treatment Methods 0.000 claims description 12
- 238000006243 chemical reaction Methods 0.000 claims description 10
- 238000004321 preservation Methods 0.000 claims description 10
- 239000002562 thickening agent Substances 0.000 claims description 10
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 claims description 8
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 8
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- JIGUQPWFLRLWPJ-UHFFFAOYSA-N Ethyl acrylate Chemical compound CCOC(=O)C=C JIGUQPWFLRLWPJ-UHFFFAOYSA-N 0.000 claims description 8
- VVQNEPGJFQJSBK-UHFFFAOYSA-N Methyl methacrylate Chemical compound COC(=O)C(C)=C VVQNEPGJFQJSBK-UHFFFAOYSA-N 0.000 claims description 8
- 239000008367 deionised water Substances 0.000 claims description 8
- 229910021641 deionized water Inorganic materials 0.000 claims description 8
- DNJIEGIFACGWOD-UHFFFAOYSA-N ethyl mercaptane Natural products CCS DNJIEGIFACGWOD-UHFFFAOYSA-N 0.000 claims description 8
- FPYJFEHAWHCUMM-UHFFFAOYSA-N maleic anhydride Chemical compound O=C1OC(=O)C=C1 FPYJFEHAWHCUMM-UHFFFAOYSA-N 0.000 claims description 8
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- 238000001816 cooling Methods 0.000 claims description 6
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- UFVKGYZPFZQRLF-UHFFFAOYSA-N hydroxypropyl methyl cellulose Chemical compound OC1C(O)C(OC)OC(CO)C1OC1C(O)C(O)C(OC2C(C(O)C(OC3C(C(O)C(O)C(CO)O3)O)C(CO)O2)O)C(CO)O1 UFVKGYZPFZQRLF-UHFFFAOYSA-N 0.000 description 1
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Images
Classifications
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- 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
-
- 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
- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
- C04B24/24—Macromolecular compounds
- C04B24/26—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
- C04B24/2688—Copolymers containing at least three different monomers
-
- 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
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F222/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a carboxyl radical and containing at least one other carboxyl radical in the molecule; Salts, anhydrides, esters, amides, imides, or nitriles thereof
- C08F222/04—Anhydrides, e.g. cyclic anhydrides
- C08F222/06—Maleic anhydride
- C08F222/08—Maleic anhydride with vinyl aromatic monomers
-
- 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
- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/30—Water reducers, plasticisers, air-entrainers, flow improvers
- C04B2103/302—Water reducers
-
- 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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
-
- 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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/2038—Resistance against physical degradation
-
- 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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/29—Frost-thaw resistance
-
- 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
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Health & Medical Sciences (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Inorganic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses low slump loss concrete, and relates to the technical field of concrete. The technical key points are as follows: the low slump loss concrete comprises the following components in parts by weight: cement: 50-80 parts; slag: 15-20 parts of a solvent; sand and stone: 100-200 parts; clay: 10-20 parts; water: 40-50 parts; naphthalene modified water reducing agent: 1-2 parts, and the concrete prepared by the formula has the advantages of small slump loss and high strength.
Description
Technical Field
The invention relates to the technical field of concrete, in particular to low slump loss concrete and a preparation method thereof.
Background
Due to the rapid development of the building, road and bridge industries, the consumption of concrete raw materials is huge, natural high-quality sandstone is seriously in short supply, and the sandstone is excavated in mountains or river channels with high mud content in many areas, so that the high-mud-content inferior sandstone is increasingly increased. If sand with high mud content is not pretreated, the workability, the later strength and the structural stability of the concrete are greatly influenced.
When the content of soil in the sand is high, the fluidity of the concrete is sharply reduced, and the slump loss is rapid. In addition, when the content of soil in the sand and stone is more, the bonding strength between cement and sand and stone can be reduced, so that the properties of the concrete such as compression resistance, shrinkage resistance, fracture resistance, wear resistance and the like are adversely affected, and the strength of the concrete is greatly reduced.
Therefore, a new technical solution is needed to solve the above problems.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide the low-slump loss concrete which has the advantages of small slump loss and high strength.
In order to achieve the first purpose, the invention provides the following technical scheme:
the low slump loss concrete comprises the following components in parts by weight:
cement: 50-80 parts;
slag: 15-20 parts of a solvent;
sand and stone: 100-200 parts;
clay: 10-20 parts;
water: 40-50 parts;
naphthalene modified water reducing agent: 1-2 parts.
By adopting the technical scheme, the slag is the granulated blast furnace slag powder which is called as a high-quality concrete admixture for short, the added slag is combined with the granulated blast furnace slag of GB/T203 standard, and after drying and grinding, the granulated blast furnace slag reaches the powder with equivalent fineness and meets equivalent activity index, and the powder can improve the impermeability and frost resistance of the concrete, increase the slump and endow the concrete with higher strength and better workability.
The invention also synergistically uses a modified naphthalene water reducer, which has the characteristics of combining the performance of a high-efficiency water reducer and a high-quality pumping agent, the water reducing rate is obviously improved compared with that of a commercially available product, and simultaneously slump can be basically not lost within a certain time, so that the modified naphthalene water reducer has good plasticity retention property.
Further preferably, the naphthalene-based modified water reducing agent comprises the following components in parts by weight:
naphthalene water reducing agent: 82-85 parts;
modifying agent: 14-18 parts;
thickening agent: 0.2-0.4 part;
defoaming agent: 0.5-1 part.
By adopting the technical scheme, the thickening agent mainly plays a role in thickening the naphthalene modified water reducing agent, the storage stability is improved, and the defoaming agent plays a role in reducing bubbles generated by stirring.
More preferably, the naphthalene modified water reducing agent is prepared by the following steps: and (3) uniformly mixing and stirring the naphthalene water reducer, the modifier and the defoaming agent, adding the thickener, and uniformly mixing and stirring to obtain the naphthalene modified water reducer.
By adopting the technical scheme, the naphthalene modified water reducer prepared by the method is simple to operate, has high efficiency, can be prepared on site, and can be stored for a long time.
Further preferably, the modifier comprises the following components in parts by weight:
maleic anhydride: 30-35 parts;
azobisisobutyronitrile: 1-2 parts;
mercaptoethanol: 1-2 parts;
styrene: 15-18 parts;
acrylic acid: 12-15 parts;
methyl methacrylate: 25-30 parts;
ethyl acrylate: 25-28 parts;
22-25 parts of β -hydroxypropyl acrylate;
deionized water: 100 parts.
By adopting the technical scheme, the modifier prepared by adopting the formula, namely the water-soluble polymer is used as a component with reactivity with cement to modify the naphthalene water reducer, so that a new use function is given to the naphthalene water reducer. The reactivity of the modifier and the cement is realized in that the segment of the modifier has stronger adsorption effect on the cement than other components, so that the modifier preferentially adsorbs the most active cement mineral components in the system, and the particles which usually hydrate firstly are isolated from contact with other components, thereby playing the role of inhibiting initial hydration.
More preferably, the modifier is prepared by uniformly mixing maleic anhydride, azobisisobutyronitrile, mercaptoethanol and deionized water, heating to 70-75 ℃, reacting at a constant temperature for 30min, heating to 80-85 ℃, adding styrene, acrylic acid, methyl methacrylate, ethyl acrylate and β -hydroxypropyl acrylate, reacting at a constant temperature for 2-4h, cooling to room temperature, and adjusting the pH value.
By adopting the technical scheme, the method and the reasonable proportion of the components are adopted, so that the water-soluble polymer capable of modifying the naphthalene water reducer is prepared, the cement hydration is properly inhibited at the initial stage of concrete mixing, and the normal setting of concrete is not influenced.
More preferably, the solid content of the modifier is 20-22%, and the pH is 7-8.
By adopting the technical scheme, the solid content of the naphthalene-based modified water reducing agent is increased, so that the production cost is high, the viscosity of the product is difficult to control, the naphthalene-based modified water reducing agent with the solid content within the range of 20-22% has good water retention performance, the initial hydration of cement can be inhibited, and the prepared concrete has the characteristics of low slump and high hardness.
More preferably, 0.3 to 0.5 part of mixed fiber is also added.
By adopting the technical scheme, the concrete fiber can enhance the early strength and the elongation at break of concrete, can effectively control micro cracks caused by concrete shrinkage, drying shrinkage and temperature change, prevent and inhibit the formation and development of concrete primary cracks, greatly improve the anti-cracking and anti-permeability performance and the anti-abrasion performance of the concrete, increase the toughness of the concrete and further improve the service life of the concrete.
Further preferably, the mixed fiber includes a polyurethane fiber and a glass fiber.
By adopting the technical scheme, the glass fiber is an inorganic non-metallic material with excellent performance, has various varieties and has the advantages of strong heat resistance, good corrosion resistance and high mechanical strength; the polyurethane fiber is a synthetic fiber prepared by taking polyurethane as a raw material through dry spinning or wet spinning, has high elastic recovery rate and high elongation at break similar to rubber silk, and the two fibers are compounded for use, so that the prepared concrete has the characteristics of high hardness and strong breaking resistance.
The second purpose of the invention is to provide a preparation method of the low slump loss concrete, and the low slump loss concrete prepared by the method has the advantages of small slump loss and high strength.
In order to achieve the second purpose, the invention provides the following technical scheme:
a preparation method of low slump loss concrete is characterized by comprising the following steps:
step one, mixing and stirring slag, gravel and clay uniformly to obtain a mixture;
step two, mixing and stirring the mixture with cement, 75% of water and a naphthalene-based modified water reducing agent uniformly;
and step three, uniformly stirring the mixture, the rest water and the mixed fibers to obtain the low-slump loss concrete.
In summary, compared with the prior art, the invention has the following beneficial effects:
(1) the granulated blast furnace slag with the composite GB/T203 standard is added, and after being dried and ground, the granulated blast furnace slag reaches a powder with a considerable fineness and a considerable activity index, and when the granulated blast furnace slag is added into concrete, the impermeability and frost resistance of the concrete can be improved, the slump can be increased, and the concrete is endowed with higher strength and better workability;
(2) the modified naphthalene water reducer is also cooperatively used, has the characteristics of high-efficiency water reducer and high-quality pumping agent, has obviously improved water reducing rate compared with the commercially available product, can ensure that the slump constant is not lost basically within a certain time, and has good plasticity retention property;
(3) the invention also adds the mixed fiber composed of glass fiber and polyurethane fiber, which greatly improves the anti-cracking and anti-permeability performance, the anti-impact and anti-abrasion performance of the concrete and increases the toughness of the concrete.
Drawings
FIG. 1 is a process flow diagram of the present invention.
Detailed Description
The invention is described in detail below with reference to the figures and examples. It is to be noted that those not indicated for specific conditions, carried out under the conventional conditions or conditions recommended by the manufacturer, and those not indicated for the reagents or equipment, are conventional products which can be obtained by commercially purchasing them.
The defoaming agent in the application adopts polydimethylsiloxane, and the molecular weight is 1200;
the thickening agent adopts hydroxypropyl methyl cellulose;
naphthalene based water reducing agents are commercially available.
Example 1: a low slump loss concrete is prepared by the following steps:
(1) uniformly mixing 30 parts of maleic anhydride, 1 part of azobisisobutyronitrile, 1 part of mercaptoethanol and 100 parts of deionized water, heating to 70 ℃, carrying out heat preservation reaction for 30min, then heating to 80 ℃, adding 15 parts of styrene, 12 parts of acrylic acid, 25 parts of methyl methacrylate, 25 parts of ethyl acrylate and 22 parts of β -hydroxypropyl acrylate, carrying out heat preservation reaction for 2h, cooling to room temperature, and adjusting the pH to 7 to obtain a modifier with the solid content of 20%;
(2) mixing and stirring 82 parts of naphthalene water reducer, 14 parts of modifier and 0.5 part of defoamer uniformly, adding 0.2 part of thickener, and mixing and stirring uniformly to obtain naphthalene modified water reducer;
(3) mixing and stirring 15 parts of slag, 100 parts of sand and 10 parts of clay uniformly to obtain a mixture; mixing and stirring the mixture, 50 parts of cement, 30 parts of water and 1 part of naphthalene modified water reducer uniformly; then adding 10 parts of water and 0.3 part of mixed fiber, and uniformly stirring to obtain the low slump loss concrete.
Wherein the mixed fiber comprises polyurethane fiber and glass fiber, and the weight ratio of the polyurethane fiber to the glass fiber is 1: 1.
Example 2: a low slump loss concrete is prepared by the following steps:
(1) uniformly mixing 33 parts of maleic anhydride, 1.5 parts of azobisisobutyronitrile, 1.5 parts of mercaptoethanol and 100 parts of deionized water, heating to 70 ℃, carrying out heat preservation reaction for 30min, then heating to 80 ℃, adding 17 parts of styrene, 14 parts of acrylic acid, 28 parts of methyl methacrylate, 27 parts of ethyl acrylate and 24 parts of β -hydroxypropyl acrylate, carrying out heat preservation reaction for 2h, cooling to room temperature, and adjusting the pH to 7 to obtain a modifier with the solid content of 20%;
(2) mixing and stirring 84 parts of naphthalene water reducer, 16 parts of modifier and 0.8 part of defoamer uniformly, adding 0.3 part of thickener, and mixing and stirring uniformly to obtain naphthalene modified water reducer;
(3) mixing and stirring 18 parts of slag, 150 parts of sand and 15 parts of clay uniformly to obtain a mixture; mixing and stirring the mixture with 65 parts of cement, 33 parts of water and 1.5 parts of naphthalene modified water reducer uniformly; and adding 12 parts of water and 0.4 part of mixed fiber, and uniformly stirring to obtain the low slump loss concrete.
Wherein the mixed fiber comprises polyurethane fiber and glass fiber, and the weight ratio of the polyurethane fiber to the glass fiber is 1: 1.
Example 3: a low slump loss concrete is prepared by the following steps:
(1) uniformly mixing 35 parts of maleic anhydride, 2 parts of azobisisobutyronitrile, 2 parts of mercaptoethanol and 100 parts of deionized water, heating to 70 ℃, carrying out heat preservation reaction for 30min, then heating to 80 ℃, adding 18 parts of styrene, 15 parts of acrylic acid, 30 parts of methyl methacrylate, 28 parts of ethyl acrylate and 25 parts of β -hydroxypropyl acrylate, carrying out heat preservation reaction for 2h, cooling to room temperature, and adjusting the pH to 7 to obtain a modifier with the solid content of 20%;
(2) mixing and stirring 85 parts of naphthalene water reducer, 18 parts of modifier and 1 part of defoamer uniformly, adding 0.4 part of thickener, and mixing and stirring uniformly to obtain naphthalene modified water reducer;
(3) mixing and stirring 20 parts of slag, 200 parts of sand and 20 parts of clay uniformly to obtain a mixture; mixing and stirring the mixture, 80 parts of cement, 35 parts of water and 2 parts of naphthalene modified water reducer uniformly; then adding 15 parts of water and 0.5 part of mixed fiber, and uniformly stirring to obtain the low slump loss concrete.
Wherein the mixed fiber comprises polyurethane fiber and glass fiber, and the weight ratio of the polyurethane fiber to the glass fiber is 1: 1.
Example 4: a low slump loss concrete is prepared by the following steps:
(1) uniformly mixing 30 parts of maleic anhydride, 1 part of azobisisobutyronitrile, 1 part of mercaptoethanol and 100 parts of deionized water, heating to 75 ℃, carrying out heat preservation reaction for 30min, then heating to 85 ℃, adding 15 parts of styrene, 12 parts of acrylic acid, 25 parts of methyl methacrylate, 25 parts of ethyl acrylate and 22 parts of β -hydroxypropyl acrylate, carrying out heat preservation reaction for 4h, cooling to room temperature, and adjusting the pH to 8 to obtain a modifier with the solid content of 22%;
(2) mixing and stirring 82 parts of naphthalene water reducer, 14 parts of modifier and 0.5 part of defoamer uniformly, adding 0.2 part of thickener, and mixing and stirring uniformly to obtain naphthalene modified water reducer;
(3) mixing and stirring 15 parts of slag, 100 parts of sand and 10 parts of clay uniformly to obtain a mixture; mixing and stirring the mixture, 50 parts of cement, 30 parts of water and 1 part of naphthalene modified water reducer uniformly; then adding 10 parts of water and 0.3 part of mixed fiber, and uniformly stirring to obtain the low slump loss concrete.
Wherein the mixed fiber comprises polyurethane fiber and glass fiber, and the weight ratio of the polyurethane fiber to the glass fiber is 1: 1.
Example 5: a low slump loss concrete is different from example 1 in that the mixed fiber comprises polyurethane fiber and glass fiber in a weight ratio of 1: 2.
Example 6: a low slump loss concrete, which is different from example 1 in that the mixed fiber comprises polyurethane fiber and glass fiber in a weight ratio of 2: 1.
Comparative example 1: the difference from example 1 is that comparative example 1 is a concrete prepared in example 1 without adding a water reducing agent.
Comparative example 2: the difference from example 1 is that comparative example 2 is a concrete prepared without modifying the naphthalene based water reducing agent added in example 1.
Comparative example 3: the difference from example 1 is that comparative example 3 is a concrete prepared in example 1 without adding a mixed fiber.
Performance testing
The low slump loss concrete prepared in examples 1 to 16 and the concrete prepared in comparative examples 1 to 3 were tested for slump loss and compressive strength according to GB/T50080-2016 Standard test method for Performance of general concrete mixture and GB/T50080-2002 test method for Performance of general concrete mixture and by a TYE-3000 computer full-automatic concrete pressure machine, respectively.
The concrete obtained by adopting the modified naphthalene water reducing agent and compounding the mixed fiber consisting of the polyurethane fiber and the glass fiber has lower slump loss and higher hardness.
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may occur to those skilled in the art without departing from the principle of the invention, and are considered to be within the scope of the invention.
Claims (9)
1. The low slump loss concrete is characterized by comprising the following components in parts by weight:
cement: 50-80 parts;
slag: 15-20 parts of a solvent;
sand and stone: 100-200 parts;
clay: 10-20 parts;
water: 40-50 parts;
naphthalene modified water reducing agent: 1-2 parts.
2. The low slump loss concrete of claim 1, wherein the naphthalene modified water reducer comprises the following components in parts by weight:
naphthalene water reducing agent: 82-85 parts;
modifying agent: 14-18 parts;
thickening agent: 0.2-0.4 part;
defoaming agent: 0.5-1 part.
3. The low slump loss concrete of claim 2, wherein the naphthalene modified water reducer is prepared by the following steps: and (3) uniformly mixing and stirring the naphthalene water reducer, the modifier and the defoaming agent, adding the thickener, and uniformly mixing and stirring to obtain the naphthalene modified water reducer.
4. The low slump loss concrete of claim 2, wherein the modifier comprises the following components in parts by weight:
maleic anhydride: 30-35 parts;
azobisisobutyronitrile: 1-2 parts;
mercaptoethanol: 1-2 parts;
styrene: 15-18 parts;
acrylic acid: 12-15 parts;
methyl methacrylate: 25-30 parts;
ethyl acrylate: 25-28 parts;
22-25 parts of β -hydroxypropyl acrylate;
deionized water: 100 parts.
5. The low slump loss concrete as claimed in claim 4, wherein the modifier is prepared by uniformly mixing maleic anhydride, azobisisobutyronitrile, mercaptoethanol and deionized water, heating to 70-75 ℃, carrying out heat preservation reaction for 30min, heating to 80-85 ℃, adding styrene, acrylic acid, methyl methacrylate, ethyl acrylate and β -hydroxypropyl acrylate, carrying out heat preservation reaction for 2-4h, cooling to room temperature, and adjusting the pH value.
6. The low slump loss concrete of claim 5, wherein the modifier has a solid content of 20-22% and a pH of 7-8.
7. The low slump loss concrete of claim 1, wherein 0.3 to 0.5 parts of mixed fiber is further added.
8. The low slump loss concrete of claim 7, wherein the hybrid fiber comprises polyurethane fiber and glass fiber.
9. A preparation method of low slump loss concrete is characterized by comprising the following steps:
step one, mixing and stirring slag, gravel and clay uniformly to obtain a mixture;
step two, mixing and stirring the mixture with cement, 75% of water and a naphthalene-based modified water reducing agent uniformly;
and step three, uniformly stirring the mixture, the rest water and the mixed fibers to obtain the low-slump loss concrete.
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