CN116283042A - Powdery concrete accelerator and preparation method and application thereof - Google Patents

Powdery concrete accelerator and preparation method and application thereof Download PDF

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Publication number
CN116283042A
CN116283042A CN202111569962.5A CN202111569962A CN116283042A CN 116283042 A CN116283042 A CN 116283042A CN 202111569962 A CN202111569962 A CN 202111569962A CN 116283042 A CN116283042 A CN 116283042A
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concrete
water
powdery
accelerator
parts
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CN116283042B (en
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谭强强
王鹏飞
成敬瑜
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Huzhou Green Manufacturing Center
Institute of Process Engineering of CAS
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Huzhou Green Manufacturing Center
Institute of Process Engineering of CAS
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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
    • 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
    • C04B40/0042—Powdery mixtures
    • 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
    • C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
    • C04B2103/10—Accelerators; Activators
    • C04B2103/12—Set accelerators
    • 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
    • C04B2111/00241—Physical properties of the materials not provided for elsewhere in C04B2111/00
    • C04B2111/00293—Materials impermeable to liquids
    • 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)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Inorganic Chemistry (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)

Abstract

The invention provides a powdery concrete accelerator, a preparation method and application thereof, wherein the powdery concrete accelerator comprises the combination of sodium silicate, sodium aluminate, aluminum sulfate, a silane coupling agent, water-absorbing expansion rubber and citric acid according to parts by weight; the silane coupling agent can form a deformable layer in inorganic materials and organic materials of the concrete member, so that the dry shrinkage phenomenon and interface stress generated by shrinkage in the drying process of the concrete member can be alleviated, and the toughness and the fracture strength of the concrete member are effectively enhanced; meanwhile, the water-absorbing expansion rubber with specific parts is added, so that micropores can be blocked when water seepage occurs to the concrete member, further water seepage of the concrete member is prevented, and the water-blocking performance of the concrete member is improved.

Description

Powdery concrete accelerator and preparation method and application thereof
Technical Field
The invention belongs to the technical field of concrete, and particularly relates to a powdery concrete accelerator, a preparation method and application thereof.
Background
The accelerator is a concrete admixture capable of remarkably shortening the time required for changing concrete from slurry to solid, and can lose fluidity and harden the concrete within a few minutes after being mixed with the concrete, so that the concrete can be quickly coagulated after being sprayed on a working surface, rebound loss is reduced, the sprayed concrete is prevented from falling off due to gravity, the adaptability and early strength of the concrete used in wet or water-containing rock stratum are improved, and the accelerator is widely applied to the engineering such as modern underground engineering, mine engineering, leakage stopping and emergency rescue at present.
However, the use of the accelerator causes the concrete to solidify too quickly, which results in lower fluidity of the concrete, and further causes insufficient sedimentation of the concrete before hardening, and excessive sedimentation after hardening, shrinkage cracks are likely to occur on the reinforcing steel bars and at the joints of the walls, the plates, the beams and the columns after pouring for several hours, so that in order to solve the problem that the cement is easy to crack, the toughness of the cement is generally improved by adding some organic matters and cellulose. CN107709268A discloses a shotcrete accelerator which is a solid comprising at least one of symphobic alum and hydroalunite or an aqueous suspension or slurry of the solid, and a method of preparing the shotcrete accelerator as a solid form; the solid shotcrete accelerator is redispersible in water to produce a stable aqueous dispersion or slurry. The extended shelf life and reduced shipping costs of the solid and aqueous dispersions are major advantages. CN110482902a discloses a concrete rapid setting additive based on organic silicon, which comprises two components of hydrolysate and curing agent, wherein the hydrolysate consists of isopropanol, water and a small amount of hydrochloric acid, and the curing agent is tetramethoxysilane. The two components are uniformly mixed according to a certain proportion before being used, and then the mixture is directly sprayed on the surface of the freshly molded and cast concrete, the solidification speed of the concrete can be obviously accelerated, and the tetraethoxysilane is quickly hydrolyzed into SiO when meeting water 2 And ethanol, the formed silicon dioxide can accelerate hydration of cement minerals and promote generation of early ettringite; meanwhile, tetraethoxysilane hydrolyzes and consumes water, ethanol and isopropyl alcohol and water which are originally present form volatile azeotropic hydrate, so that the volatilization of water in concrete is accelerated; the nano silicon dioxide can obviously improve the bonding performance of the interface between the cement stone and the aggregate, compact the internal structure of the concrete, reduce the porosity and greatly improve the wear resistance and crack resistance of the pavement concrete. CN113105179a discloses an anti-cracking waterproof concrete and a preparation method thereof. Crack-resistant waterproof concreteIs characterized by comprising the following components in parts by weight: and (3) cement: 250-300 parts; fly ash: 120-150 parts; mineral powder: 40-45 parts; sand: 700-750 parts; fine stone: 800-900 parts; water: 150-200 parts; water reducing agent: 2-5 parts; 40-50 parts of nano silicon nitride modified polyurethane composite fiber; elastic particles: 10-15 parts. The anti-cracking waterproof concrete prepared by adopting the formula has the advantages of high anti-cracking performance and waterproof performance.
However, the toughness and the waterproof performance of the concrete member obtained by using the concrete accelerator provided in the prior art are poor, and the fluidity of the concrete is often reduced due to the excessively high speed in the coagulation process, so that the problems of shrinkage and drying crack, void water seepage and the like can occur, and the safety of the building using the concrete member is seriously affected.
Therefore, the development of the powdery concrete accelerator which can enhance the toughness of the concrete member and improve the breaking strength of the concrete member and has the anti-cracking effect and the anti-permeability effect is an urgent problem in the field.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a powdery concrete accelerator, and a preparation method and application thereof; the powdery concrete accelerator comprises the combination of sodium silicate, sodium aluminate, aluminum sulfate, a silane coupling agent, water-swelling rubber and citric acid in specific parts; the powdery concrete accelerator can enhance the toughness of a concrete structural member, improve the breaking strength of the concrete structural member, and can also effectively improve the anti-cracking effect and the anti-permeability effect of the concrete structural member.
To achieve the purpose, the invention adopts the following technical scheme:
in a first aspect, the invention provides a powdery concrete accelerator, which comprises the following components in parts by weight:
Figure BDA0003423292830000031
wherein the sodium silicate may be 16 parts by weight, 17 parts by weight, 18 parts by weight, 19 parts by weight, 20 parts by weight, 21 parts by weight, 22 parts by weight, 23 parts by weight or 24 parts by weight, and specific point values between the above point values, are limited in space and for the sake of brevity, the present invention does not exhaustively enumerate the specific point values included in the range.
The sodium aluminate may be 16 parts by weight, 17 parts by weight, 18 parts by weight, 19 parts by weight, 20 parts by weight, 21 parts by weight, 22 parts by weight, 23 parts by weight or 24 parts by weight, and specific point values between the above point values are limited in length and for the sake of brevity, the present invention is not exhaustive of the specific point values included in the range.
The aluminum sulfate may be 41 parts by weight, 42 parts by weight, 43 parts by weight, 44 parts by weight, 45 parts by weight, 46 parts by weight, 47 parts by weight, 48 parts by weight or 49 parts by weight, and specific point values between the above point values are limited in length and for brevity, the present invention is not intended to exhaustively list the specific point values included in the range.
The silane coupling agent may be 6 parts by weight, 7 parts by weight, 8 parts by weight, 9 parts by weight, 10 parts by weight, 11 parts by weight, 12 parts by weight, 13 parts by weight or 14 parts by weight, and specific point values between the above point values are limited and for the sake of brevity, the present invention does not exhaustively list the specific point values included in the range.
The water-swellable rubber may be 1.5 parts by weight, 2 parts by weight, 2.5 parts by weight, 3 parts by weight, 3.5 parts by weight, 4 parts by weight or 4.5 parts by weight, and specific point values between the above point values, are limited in length and for brevity, the present invention is not intended to be exhaustive of the specific point values included in the range.
The citric acid may be 3.5 parts by weight, 4 parts by weight, 4.5 parts by weight, 5 parts by weight, 5.5 parts by weight, 6 parts by weight, 6.5 parts by weight, 7 parts by weight or 7.5 parts by weight, and specific point values between the above point values, are limited in length and for brevity, the present invention is not exhaustive of the specific point values included in the range.
The powdery concrete accelerator provided by the invention comprises the combination of sodium silicate, sodium aluminate, aluminum sulfate, a silane coupling agent, water-swelling rubber and citric acid in a specific part; the powdery concrete accelerator takes sodium silicate, sodium aluminate, aluminum sulfate and citric acid as main components, and a specific part of silane coupling agent is added into the powdery concrete accelerator, wherein the silane coupling agent has reactive groups combined with inorganic materials (cement, metal and the like) and reactive groups combined with organic materials (rubber, resin and the like), so that a deformable layer can be formed between the inorganic materials and the organic materials in the concrete member under the action of water in application, and on one hand, the deformable layer can alleviate the dry shrinkage phenomenon of the concrete member in the coagulation process, effectively improve the anti-dry cracking effect of the concrete member and reduce the dry cracking rate of the concrete member; on the other hand, the deformable layer can also relieve the interfacial stress generated by the difference of thermal shrinkage rates between the resin and the filler in the hydration and drying processes of the composite material in the concrete member, so that the toughness of the concrete member can be effectively enhanced, and the breaking strength of the concrete member is improved; meanwhile, the powdery concrete accelerator provided by the invention is further added with the water-absorbing expansion resin with specific parts, when the water-absorbing expansion resin is used for water seepage of the concrete member, the water-absorbing expansion resin can further be used for blocking micro gaps, so that the effect of preventing water seepage is realized, and the anti-seepage effect of the concrete member is improved.
Preferably, the silane coupling agent comprises any one or a combination of at least two of ethoxysilane, methoxysilane, vinyltriethoxysilane, vinyltrimethoxysilane or vinyltris (β -methoxyethoxy) silane.
Preferably, the particle size of the water-swellable rubber is 10 to 300. Mu.m, for example 20. Mu.m, 50. Mu.m, 70. Mu.m, 90. Mu.m, 110. Mu.m, 130. Mu.m, 150. Mu.m, 170. Mu.m, 190. Mu.m, 210. Mu.m, 230. Mu.m, 250. Mu.m, 270. Mu.m or 290. Mu.m, and specific point values between the above point values, are limited in space and for the sake of brevity the invention is not exhaustive list of specific point values comprised in the range.
As a preferable technical scheme of the invention, the particle size of the water-absorbing expansion rubber is 10-300 mu m, if the particle size of the added water-absorbing expansion rubber is more than 300 mu m, the effect of expanding and blocking micro gaps is reduced, and the compression strength and toughness of the concrete member are influenced by larger pore size; and if the particle diameter of the added water-swellable resin is less than 10. Mu.m, the processing difficulty thereof is increased.
Preferably, the water-swellable rubber is prepared by extruding a water-absorbing modifier and a rubber.
Preferably, the water absorbing modifier comprises a water soluble polyurethane prepolymer and/or a sodium acrylate resin.
Preferably, the rubber comprises natural rubber and/or neoprene.
Preferably, the mass ratio of the water absorbing modifier to the rubber is 1 (1-3), such as 1:1.2, 1:1.4, 1:1.6, 1:1.8, 1:2, 1:2.2, 1:2.4, 1:2.6, or 1:2.8, etc.
In a second aspect, the present invention provides a method for preparing a powdered concrete accelerator according to the first aspect, the method comprising: mixing sodium silicate, sodium aluminate, a silane coupling agent, water-swelling rubber and citric acid to obtain the powdery concrete accelerator.
In a third aspect, the present invention provides a concrete element comprising concrete and a powdered concrete accelerator as described in the first aspect.
Preferably, the mass ratio of the concrete to the powdery concrete accelerator is 1 (0.02-0.06), such as 1:0.025, 1:0.03, 1:0.035, 1:0.04, 1:0.045, 1:0.05, or 1:0.055, etc.
In a fourth aspect, the present invention provides a method for preparing a concrete member according to the third aspect, the method comprising: mixing the concrete with the powdery concrete accelerator, adding water for pouring, and drying to obtain the concrete member.
Compared with the prior art, the invention has the following beneficial effects:
(1) The powdery concrete accelerator provided by the invention comprises the combination of sodium silicate, sodium aluminate, aluminum sulfate, a silane coupling agent, water-swelling rubber and citric acid in a specific part; by adding a specific part of silane coupling agent, when the concrete accelerator is applied to a concrete member, the silane coupling agent can form a deformable layer between the inorganic material and the organic material of the concrete member under the action of water by utilizing the characteristic that the silane coupling agent can react with the inorganic material and the organic material at the same time, so that the shrinkage phenomenon of the concrete member can be relieved, the anti-dry cracking effect of the concrete member is effectively improved, and the dry cracking rate of the concrete member is reduced; meanwhile, the deformable layer can also relieve interfacial stress of the composite material in the concrete member, which is generated by different heat shrinkage rates between resin and filler in the hydration and drying processes, so that the toughness of the concrete member can be enhanced, and the breaking strength of the concrete member can be improved; when water seepage occurs to the concrete member, the water-absorbing expansion resin can be used for water absorption expansion to block the micro-gap, so that the seepage-proofing effect of the concrete member is improved.
(2) In conclusion, the powdery concrete accelerator provided by the invention can enhance the toughness of a concrete member, improve the breaking strength of the concrete member and prevent the concrete member from cracking and water seepage, and particularly, the Poisson ratio of the concrete member obtained by adopting the powdery concrete accelerator provided by the invention is 0.28-0.39, the cracking index is 2.5-6.1%, the impervious pressure is 1.2-1.5 MPa, and the safety of the building of the concrete member can be effectively improved.
Detailed Description
The technical scheme of the invention is further described by the following specific embodiments. It will be apparent to those skilled in the art that the examples are merely to aid in understanding the invention and are not to be construed as a specific limitation thereof.
Preparation example 1
A water-swelling rubber with a particle size of 150 μm;
the preparation method of the water-swellable rubber provided by the preparation example comprises the following steps: the water-soluble polyurethane prepolymer (Jiangsu Qiameite polyurethane New Material Co., ltd., K1250), polyurethane rubber vulcanizing agent MOCA (Jiangsu Qiameite polyurethane New Material Co., ltd.) and natural rubber are melted and extruded at 120 ℃ to obtain the water-absorbing swelling rubber.
Preparation example 2
A water-swelling rubber with a particle size of 300 μm;
the preparation method of the water-swellable rubber provided by the preparation example comprises the following steps: the water-soluble polyurethane prepolymer (Jiangsu Qiameite polyurethane New Material Co., ltd., K1250), polyurethane rubber vulcanizing agent MOCA (Jiangsu Qiameite polyurethane New Material Co., ltd.) and natural rubber are melted and extruded at 120 ℃ to obtain the water-absorbing swelling rubber.
Preparation example 3
A water-swelling rubber with a particle size of 150 μm;
the preparation method of the water-swellable rubber provided by the preparation example comprises the following steps: the water-swelling rubber was obtained by melt-extruding a sodium acrylate resin (Desoxhlet, LP 64/12N) and neoprene at 110 ℃.
Preparation example 4
A water-swelling rubber with a particle size of 400 μm;
the preparation method comprises the following steps: the water-soluble polyurethane prepolymer (Jiangsu Qiameite polyurethane New Material Co., ltd., K1250), polyurethane rubber vulcanizing agent MOCA (Jiangsu Qiameite polyurethane New Material Co., ltd.) and natural rubber are melted and extruded at 120 ℃ to obtain the water-absorbing swelling rubber.
Example 1
The powdery concrete accelerator comprises the following components in parts by weight:
Figure BDA0003423292830000071
Figure BDA0003423292830000081
the preparation method of the powdery concrete accelerator provided by the embodiment comprises the following steps: mixing sodium silicate, sodium aluminate, ethoxysilane, water-swelling rubber (preparation example 1) and citric acid to obtain the powdery concrete accelerator.
Example 2
The powdery concrete accelerator comprises the following components in parts by weight:
Figure BDA0003423292830000082
the preparation method of the powdery concrete accelerator provided by the embodiment comprises the following steps: mixing sodium silicate, sodium aluminate, ethoxysilane, water-swelling rubber (preparation example 1) and citric acid to obtain the powdery concrete accelerator.
Example 3
The powdery concrete accelerator comprises the following components in parts by weight:
Figure BDA0003423292830000083
Figure BDA0003423292830000091
the preparation method of the powdery concrete accelerator provided by the embodiment comprises the following steps: mixing sodium silicate, sodium aluminate, ethoxysilane, water-swelling rubber (preparation example 1) and citric acid to obtain the powdery concrete accelerator.
Example 4
A powdery concrete accelerator differing from example 1 only in that the water-swellable rubber obtained in preparation example 2 was used instead of the water-swellable rubber obtained in preparation example 1, and the other components, amounts and preparation methods were the same as in example 1.
Example 5
A powdery concrete accelerator is different from example 1 in that the water-swellable rubber obtained in preparation example 1 is replaced with the water-swellable rubber provided in preparation example 3, and other components, amounts and preparation methods are the same as in example 1.
Example 6
A powdery concrete accelerator is different from example 1 in that the water-swellable rubber obtained in preparation example 1 is replaced with the water-swellable rubber provided in preparation example 4, and other components, amounts and preparation methods are the same as in example 1.
Comparative example 1
The powdery concrete accelerator comprises the following components in parts by weight:
Figure BDA0003423292830000092
Figure BDA0003423292830000101
the preparation method of the powdery concrete accelerator provided by the embodiment comprises the following steps: mixing sodium silicate, sodium aluminate, ethoxysilane, natural rubber and citric acid to obtain the powdery concrete accelerator.
Comparative example 2
A powdery concrete accelerator differs from example 1 only in that no water-swellable rubber is added, and other components, amounts and preparation methods are the same as in example 1.
Comparative example 3
A powdery concrete accelerator differs from example 4 only in that no water-swellable rubber is added, and other components, amounts and preparation methods are the same as those of example 4.
Comparative example 4
A powdery concrete accelerator differs from example 1 only in that ethoxysilane is not added, and other components, amounts and preparation methods are the same as in example 1.
Application example 1
A concrete member, the method of making comprising: mixing concrete (comprising standard cement and standard sand with the mass ratio of 1:0.04) with the powdery concrete accelerator obtained in the example 1, adding water for pouring, and maintaining at the constant temperature of 25 ℃ for 7d to obtain the concrete member.
Application examples 2 to 6
A concrete member differing from application example 1 only in that the powdery concrete accelerator obtained in example 1 was replaced with the powdery concrete accelerators obtained in examples 2 to 6, respectively, and the other components and the production method were the same as those in application example 1.
Comparative examples application examples 1 to 4
A concrete member differing from application example 1 only in that the powdery concrete accelerator obtained in comparative examples 1 to 4 was used in place of the powdery concrete accelerator obtained in example 1, respectively, and the other components and the production method were the same as those of application example 1.
Performance test:
(1) Poisson ratio: according to the ultimate tensile strength test and the ultimate shear strength test method in the national standard GB/T50107-2010 ' concrete strength test evaluation Standard ', the ultimate tensile strength and the ultimate shear strength of a concrete test block are tested, and the ratio of the ultimate tensile strength to the ultimate shear strength is the Poisson's ratio;
(2) Cracking index: testing according to a cracking index testing method in GB/T29417-2012, cement mortar and concrete drying shrinkage cracking performance testing method;
(3) Pressure resistance: the test is carried out according to the method for testing the impermeability pressure in GB/T50082-2009 Standard for test methods for the long-term performance and durability of common concrete.
Concrete members corresponding to application examples 1 to 6 and comparative application examples 1 to 4 were tested in the above-described manner, and the test results are shown in table 1:
TABLE 1
Figure BDA0003423292830000111
Figure BDA0003423292830000121
From the data in table 1, it can be seen that: the concrete test block prepared by the powdery concrete accelerator has larger poisson ratio, smaller cracking index and larger impervious pressure; specifically, the concrete members obtained in application examples 1 to 6 had poisson's ratio of 0.28 to 0.39, cracking index of 2.5 to 6.1% and impermeability pressure of 1.2 to 1.5MPa.
As can be seen from the comparison of the application examples 1 and 1, the substitution of the natural rubber for the water-swelling rubber results in a decrease in poisson's ratio of the concrete member, which indicates that the toughness of the concrete member obtained in the comparison of the application example 1 is significantly decreased; at the same time, the cracking index is increased, the anti-seepage pressure is reduced, which shows that the concrete member obtained in comparative application example 1 has poorer anti-seepage effect and lower safety index.
As can be seen from comparative application examples 1 and 2, comparative application example 4 and comparative application example 3, the Poisson's ratio of the concrete member obtained without adding the water-swellable rubber is low, the toughness is poor, and the anti-permeation effect is also poor.
As can be seen from the comparison of application examples 1 and 4, the poisson ratio of the concrete member obtained without adding ethoxysilane is lower, the cracking index is greatly increased, and the impervious pressure is greatly reduced, because the silane coupling agent can effectively relieve the shrinkage phenomenon of the concrete member, and further can effectively improve the anti-dry cracking effect, and the deformable layer is formed between the silane coupling agent and the modified resin, thereby playing a synergistic effect.
Further comparing application example 1 and application example 6, it can be seen that the poisson ratio of the concrete member further prepared from the accelerator prepared from the water-absorbent expansion rubber with larger particle size is also reduced by a small extent, the cracking index is increased by a small extent, and the anti-seepage pressure is also reduced by a small extent.
The applicant states that the present invention is illustrated by the above examples as a powder concrete accelerator and a method of preparing and using it, but the present invention is not limited to the above examples, i.e. it is not meant that the present invention must be practiced in dependence upon the above examples. It should be apparent to those skilled in the art that any modification of the present invention, equivalent substitution of raw materials for the product of the present invention, addition of auxiliary components, selection of specific modes, etc., falls within the scope of the present invention and the scope of disclosure.

Claims (10)

1. The powdery concrete accelerator is characterized by comprising the following components in parts by weight:
Figure FDA0003423292820000011
2. the powder concrete accelerator of claim 1, wherein the silane coupling agent comprises any one or a combination of at least two of ethoxysilane, methoxysilane, vinyltriethoxysilane, vinyltrimethoxysilane, or vinyltris (β -methoxyethoxy) silane.
3. The powdery accelerator according to claim 1 or 2, wherein the water-swellable rubber has a particle size of 10 to 300 μm.
4. A powdered concrete accelerator according to any one of claims 1 to 3, wherein the water-swellable rubber is obtained by co-extruding a water-absorbing modifier and rubber.
5. The powdery concrete accelerator according to claim 4, wherein the water-absorbing modifier comprises a water-soluble polyurethane prepolymer and/or a sodium acrylate resin;
preferably, the rubber comprises natural rubber and/or neoprene.
6. The powdery concrete accelerator according to claim 4, wherein the mass ratio of the water absorption modifier to the rubber is 1 (1-3).
7. A method for preparing the powdery concrete accelerator according to any one of claims 1 to 6, characterized in that the preparation method comprises: mixing sodium silicate, sodium aluminate, a silane coupling agent, water-swelling rubber and citric acid to obtain the powdery concrete accelerator.
8. A concrete element, characterized in that it comprises concrete and a powdery concrete accelerator according to any one of claims 1 to 7.
9. The concrete member of claim 8, wherein the mass ratio of the concrete to the powdered concrete accelerator is 1 (0.02-0.06).
10. A method of preparing a concrete element according to claim 8 or 9, characterized in that the method comprises: mixing the concrete with the powdery concrete accelerator, adding water for pouring, and drying to obtain the concrete member.
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