CN114873964A - Early-strength micro-expansion cement-based grouting material and preparation method thereof - Google Patents

Early-strength micro-expansion cement-based grouting material and preparation method thereof Download PDF

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Publication number
CN114873964A
CN114873964A CN202210429169.3A CN202210429169A CN114873964A CN 114873964 A CN114873964 A CN 114873964A CN 202210429169 A CN202210429169 A CN 202210429169A CN 114873964 A CN114873964 A CN 114873964A
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China
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cement
grouting material
early strength
based grouting
strength micro
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Chinese (zh)
Inventor
胡少伟
郭家旭
齐浩
王沛怡
聂影
陶修
赵轩
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Chongqing University
CISDI Engineering Co Ltd
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Chongqing University
CISDI Engineering Co Ltd
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Publication of CN114873964A publication Critical patent/CN114873964A/en
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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
    • 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
    • C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
    • C04B18/04—Waste materials; Refuse
    • C04B18/06—Combustion residues, e.g. purification products of smoke, fumes or exhaust gases
    • C04B18/08—Flue dust, i.e. fly ash
    • 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
    • C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
    • C04B18/04—Waste materials; Refuse
    • C04B18/14—Waste materials; Refuse from metallurgical processes
    • C04B18/141—Slags
    • 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
    • C04B22/00—Use of inorganic materials as active ingredients for mortars, concrete or artificial stone, e.g. accelerators, shrinkage compensating agents
    • C04B22/02—Elements
    • 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
    • C04B22/00—Use of inorganic materials as active ingredients for mortars, concrete or artificial stone, e.g. accelerators, shrinkage compensating agents
    • C04B22/06—Oxides, Hydroxides
    • 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
    • C04B22/00—Use of inorganic materials as active ingredients for mortars, concrete or artificial stone, e.g. accelerators, shrinkage compensating agents
    • C04B22/08—Acids or salts thereof
    • C04B22/14—Acids or salts thereof containing sulfur in the anion, e.g. sulfides
    • 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
    • C04B24/04—Carboxylic acids; Salts, anhydrides or esters thereof
    • 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
    • C04B38/00—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof
    • C04B38/02—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof by adding chemical blowing agents
    • 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
    • C04B2111/00017—Aspects relating to the protection of the environment
    • 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
    • C04B2111/40—Porous or lightweight materials
    • 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
    • C04B2111/76—Use at unusual temperatures, e.g. sub-zero
    • 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
    • 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

Abstract

The invention provides an early strength micro-expansion grouting material and a preparation method thereof. The main components of the material are portland cement, quartz sand, fly ash, slag powder, silicon powder, calcium sulphoaluminate expanding agents, plastic expanding agents, early strength agents, water-retaining agents, defoaming agents and high-efficiency polycarboxylic acid water reducing agents. Compared with the traditional cement-based grouting material taking sulphoaluminate cement and high alumina cement as main cementing materials, the invention takes the Portland cement as the main component of the cementing material, and is matched with a certain amount of industrial by-products and a small amount of additives, thereby having the characteristics of excellent early strength, fluidity and durability and remarkable increase of later strength. The invention adopts two expansion agents for compounding, can provide obvious expansion performance in the early stage of hydration and provide micro-expansibility in the later stage of hydration, and effectively avoids the phenomenon of cracking of grouting mortar in engineering application.

Description

Early-strength micro-expansion cement-based grouting material and preparation method thereof
Technical Field
The invention belongs to the technical field of building materials, and particularly relates to an early-strength micro-expansion cement-based grouting material and a preparation method thereof.
Background
According to the method for pouring common cement mortar, the cement mortar is usually cured for more than 7 days before being put into use. The steel bar anchoring and foundation grouting of the construction and equipment such as metallurgy, chemical engineering, ionization, building materials, railways, roads, bridges and the like are often limited by the hardening and maintenance time of the secondary pouring of concrete foundations. The early-strength high-strength grouting material mainly comprises organic epoxy resin, and has the disadvantages of high manufacturing cost, aging, high toxicity and unsatisfactory effect.
The cement-based grouting material is a dry mixture with reasonable gradation, which is prepared by uniformly mixing a high-strength material serving as an aggregate, cement serving as a main cementing material, a mineral admixture, a small amount of high-performance concrete admixture and other components in a certain proportion. It has the features of high early strength, good flowability, good expansibility, no bleeding, no toxicity, no harm, etc. after being mixed with water in the construction site. The cement-based grouting material is rapidly popularized and applied in China since the 90 s of the 20 th century because of excellent working performance and mechanical property, and is widely applied to the fields of anchor bolt anchoring, concrete reinforcing and reforming, assembly type buildings and the like at present.
In the prior art, the grouting material is prepared by adopting sulphoaluminate cement and other raw materials. However, the rapid development of economic construction and the rapid popularization of assembly type buildings in China put forward higher requirements on the performance of cement-based grouting materials. In order to realize higher early strength, the existing cement-based grouting material has high production cost, unstable performance, limited later strength increase, easy cracking and poor durability, and needs to be solved urgently.
Disclosure of Invention
The invention aims to provide an early strength micro-expansion cement-based grouting material which is characterized by comprising the following components in parts by weight:
Figure BDA0003609398210000011
it is worth to be noted that, compared with the traditional cement-based grouting material using sulphoaluminate cement and high alumina cement as main cementing materials, the early strength micro-expansion cement-based grouting material using the Portland cement as the main cementing material has the characteristics of excellent early strength, fluidity, durability and obvious later strength increase by using the Portland cement as the main cementing material and simultaneously adding a certain amount of industrial byproducts and a small amount of additives. In addition, the two expanding agents are compounded, so that the obvious expansion performance can be provided at the early stage of hydration, the micro-expansibility can be provided at the later stage of hydration, and the cracking phenomenon of the grouting mortar in engineering application can be effectively avoided. The invention has positive significance for the high-speed development of economic construction and the rapid popularization of the assembly type building in China.
Further, the invention discloses a technical scheme with stronger stability, namely an early strength micro-expansion cement-based grouting material, which is characterized by comprising the following components in parts by weight:
Figure BDA0003609398210000021
further, the cement is Portland cement with the brand of PII 52.5R or above;
further, the particle size of the quartz sand is 0.1 mm-1.5 mm;
further, the fly ash is I-grade or II-grade fly ash;
further, the slag powder is S105-grade or S95-grade slag powder;
further, the silicon powder is undisturbed silicon powder, and the specific surface area is 20-30 m 2 /g。
Further, the calcium sulfoaluminate swelling agent should be a CSA-based or UEA-based swelling agent.
Further, Cl in the plastic expanding agent - The content should not be more than one ten thousandth.
Furthermore, the early strength agent is industrial-grade calcium formate, and the content of active ingredients is not lower than 65%.
Further, the water retaining agent should be methyl cellulose ether, hydroxypropyl cellulose ether, or hydroxyethyl methyl cellulose ether.
Further, the defoaming agent should be a silicone defoaming agent and should have good compatibility with all powder raw materials.
Further, the slag powder is S105-grade or S95-grade slag powder;
further, the silicon powder is undisturbed silicon powder, and the specific surface area is 20-30 m 2 /g
Furthermore, the early strength agent is industrial-grade calcium formate, and the content of active ingredients is not lower than 65%.
The invention also discloses a preparation method of the early strength micro-expansion cement-based grouting material based on the material, which is characterized by comprising the following steps:
uniformly mixing all the raw materials in proportion to obtain a dry mixture;
during grouting, the water addition amount is 9-12% of the mass of the dry mixture;
and mechanically stirring the dry mixture added with water for more than 5 minutes to obtain the grouting material. The grouting material has excellent fluidity and can be used for grouting according to engineering requirements.
The invention has the advantages that:
the fly ash and slag powder and other mineral admixtures are used, the particles can be adsorbed on the surfaces of negatively charged cement particles, the ball effect is achieved, the shear stress and the plastic viscosity of slurry can be reduced to a great extent, and the fluidity is improved. The fly ash and the slag powder belong to traditional industrial waste, so that the waste recycling is realized, and the environment is friendly;
secondly, the Portland cement is used as a main cementing material, so that the stable increase of later strength and excellent durability are facilitated;
thirdly, calcium formate is added as an early strength agent, and the acidic environment and Ca generated by ionization of calcium formate 2+ Promote C 2 S and C 3 Hydration of S and crystallization of AFT, favoring AFT, Ca (OH) 2 Hydration products such as C-S-H gel and the like are quickly formed in the early stage, so that the early strong quick growth of slurry is promoted, and the grouting material has certain frost resistance;
and fourthly, compounding the calcium sulphoaluminate expanding agent and the plastic expanding agent, wherein the plastic expanding agent is added to react with water under an alkaline condition to generate nitrogen gas before the cement is hydrated to be coagulated, so that the early expansion performance is provided for the cement-based grouting material. The calcium sulphoaluminate expanding agent mainly contributes to the expansion of cement after final setting, and the hydration product fills the gap between the aggregate and the cementing material, so that the cement-based grouting material has better expansion performance in the middle and later periods, better compactness and more excellent strength.
Detailed Description
The present invention is further illustrated by the following examples, but it should not be construed that the scope of the above-described subject matter is limited to the following examples. Various substitutions and alterations can be made without departing from the technical idea of the invention and the scope of the invention is covered by the present invention according to the common technical knowledge and the conventional means in the field.
The main components of the cementitious materials used in the examples (cement, fly ash, slag powder, silica fume) are shown in table 1.
TABLE 1 P.II 52.5R chemical composition of cement, slag powder, fly ash and silicon powder (%)
Figure BDA0003609398210000031
Wherein the cement is PII 52.5R portland cement; the fly ash is grade II fly ash with the density of 2.4g/cm 2 Water content 0.5%; the slag powder is S95 grade slag powder, and the specific surface area is 429.3m 2 Per kg; silicon powder, specific surface area 24000m 2 Kg, water requirement 136%.
The UEA expander used in the examples was an off-white powder in appearance with a bulk density of 0.78g/cm 2 The main expansion components of the material are aluminum sulfate, alumina and potassium sulphoaluminate, the expansion is stable, and the main components are shown in table 1; the plastic expanding agent is a water-soluble gas-generating material, is light yellow powder in appearance, has the particle size of 2-5 mu m, is a complex mixture formed by sintering and finely grinding bauxite mineral with calcium oxide and carbon in a nitrogen environment, and reacts with water in an alkaline environment to generate nitrogen so as to expand slurry; the defoaming agent is a nonionic surfactant, the appearance of the defoaming agent is white powder, and the main chemical components are mineral oil and polyethylene glycol; the high-efficiency polycarboxylic acid water reducing agent is white powder in appearance, is easy to dissolve in water and has the water reducing rate of 28 percent.
Example 1:
weighing the following components in parts by weight:
quartz sand 45kg (particle size 0.3 mm-2.36 mm)
40kg of Portland cement P II 52.5R
Fly ash 3kg (II level)
Slag powder 3kg (S95 grade)
2kg of silicon powder (specific surface area 24000 m) 2 /g)
UEA expanding agent 4kg
Plastic expanding agent 20g (Cl) - The content is not higher than 0.005%)
Calcium formate early strength agent 400g
Hydroxypropyl cellulose ether 100g
Defoaming agent 200g (Silicone defoamer)
400g of high-efficiency polycarboxylic acid water reducing agent.
After all the components are put into a forced concrete mixer and uniformly mixed, 20kg of dry mixture is taken out, 2kg of water is added, and the dry mixture can be used after being uniformly mixed by a hand-held mixer.
The results of the performance test of the cement-based grouting material are shown in table 2.
Example 2:
weighing the following components in parts by weight:
quartz sand 50kg (adopting ISO standard sand)
38kg of Portland cement P II 52.5R
Fly ash 2.5kg (II level)
Slag powder 2.5kg (S95 grade)
2kg of silicon powder (specific surface area 24000 m) 2 /g)
UEA expanding agent 4kg
Plastic expanding agent 30g (Cl) - The content is not higher than 0.005%)
Calcium formate early strength agent 500g
150g of methyl cellulose ether
Defoaming agent 200g
300g of high-efficiency polycarboxylic acid water reducing agent.
All the components are put into a forced concrete mixer to be uniformly mixed, the dry mixture is taken out, 6kg of the dry mixture is added with 660g of water, and the cement mortar mixer is adopted to uniformly mix the mixture for use.
The results of the performance test of the cement-based grouting material are shown in table 2.
Example 3:
weighing the following components in parts by weight:
quartz sand 45kg (particle size 0.08 mm-2.36 mm)
40kg of Portland cement P II 52.5R
Fly ash 3kg (II level)
Slag powder 3kg (S95 grade)
2.5kg of silicon powder (specific surface area 24000 m) 2 /g)
UEA expanding agent 5kg
Plastic expanding agent 20g (Cl) - The content is not higher than 0.005%)
Calcium formate early strength agent 400g
120g of methyl cellulose ether
Defoaming agent 150g
400g of high-efficiency polycarboxylic acid water reducing agent.
All the components are put into a forced concrete mixer to be uniformly mixed, and then 50kg of water is directly added into the mixer to be uniformly mixed for use.
The results of the performance test of the cement-based grouting material are shown in table 2.
Example 4:
weighing the following components in parts by weight:
quartz sand 50kg (using ISO standard sand)
42kg of Portland cement P II 52.5R
Fly ash 2.1kg (II level)
Slag powder 2.1kg (S95 grade)
1kg of silicon powder (specific surface area 24000 m) 2 /g)
UEA expanding agent 3kg
Plastic expanding agent 15g (Cl) - The content is not higher than 0.005%)
Calcium formate early strength agent 50g
Hydroxypropyl cellulose ether 250g
Defoaming agent 200g
400g of high-efficiency polycarboxylic acid water reducing agent.
After all the components are put into a forced concrete mixer and uniformly mixed, 20kg of dry mixture is taken out, 2kg of water is added, and the dry mixture can be used after being uniformly mixed by a hand-held mixer. The cement-based grouting material prepared by the mixing ratio is applied to the connection of the steel bar-metal corrugated pipe grout anchor, the cement-based grouting material shows excellent working performance in a test, and a test result shows that when the anchoring length is not less than 7 times of the diameter of the steel bar, and a drawing test is carried out after 28 days of maintenance, the steel bar fracture and damage appear in a test piece, the mechanical property of the steel bar is fully exerted, and the prepared cement-based grouting material is shown to have excellent performance.
The results of the performance test of the cement-based grouting material are shown in table 2.
Table 2 performance test table for cement-based grouting material
Figure BDA0003609398210000061

Claims (10)

1. The early-strength micro-expansion cement-based grouting material is characterized by comprising the following components in parts by weight:
Figure FDA0003609398200000011
2. the early strength micro-expansion cement-based grouting material with stronger stability is characterized by comprising the following components in percentage by weight:
Figure FDA0003609398200000012
。
3. an early strength micro-expansive cement-based grouting material according to claim 1 or 2, characterized in that: the cement is Portland cement with the P II 52.5R mark or above.
4. An early strength micro-expansive cement-based grouting material according to claim 1 or 2, characterized in that: the particle size of the quartz sand is 0.1 mm-1.5 mm.
5. An early strength micro-expansive cement-based grouting material according to claim 1 or 2, characterized in that: the fly ash is I-grade or II-grade fly ash.
6. An early strength micro-expansive cement-based grouting material according to claim 1 or 2, characterized in that: the calcium sulfoaluminate expanding agent is a CSA expanding agent or a UEA expanding agent.
7. An early strength micro-expansive cement-based grouting material according to claim 1 or 2, characterized in that: cl in the plastic expanding agent - The content should not be more than one ten thousandth.
8. An early strength micro-expansive cement-based grouting material according to claim 1 or 2, characterized in that: the water retaining agent should be methyl cellulose ether, hydroxypropyl cellulose ether or hydroxyethyl methyl cellulose ether.
9. An early strength micro-expansive cement-based grouting material according to claim 1 or 2, characterized in that: the defoaming agent should be a silicone-based defoaming agent.
10. A preparation method of the early strength micro-expansion cement-based grouting material based on the material of any one of claims 1 to 9 is characterized by comprising the following steps:
uniformly mixing all the raw materials in proportion to obtain a dry mixture;
during grouting, the water addition amount is 9-12% of the dry mixture by mass;
and mechanically stirring the dry mixture added with water for more than 5 minutes to obtain the grouting material.
CN202210429169.3A 2022-04-22 2022-04-22 Early-strength micro-expansion cement-based grouting material and preparation method thereof Pending CN114873964A (en)

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