CN115043625B - Porous high-expansion ceramic sand crack resistant agent for concrete and preparation method thereof - Google Patents
Porous high-expansion ceramic sand crack resistant agent for concrete and preparation method thereof Download PDFInfo
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- CN115043625B CN115043625B CN202210725593.2A CN202210725593A CN115043625B CN 115043625 B CN115043625 B CN 115043625B CN 202210725593 A CN202210725593 A CN 202210725593A CN 115043625 B CN115043625 B CN 115043625B
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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
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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
- C04B28/08—Slag cements
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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
- C04B38/00—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof
- C04B38/009—Porous or hollow ceramic granular materials, e.g. microballoons
-
- 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
- C04B38/10—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof by using foaming agents or by using mechanical means, e.g. adding preformed foam
-
- 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
- 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
- C04B2111/40—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
- 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 discloses a porous high-expansion ceramic sand crack resistant agent for concrete and a preparation method thereof. The cracking resistance agent comprises, by weight, 20% -30% of a composite expansion agent, 15% -25% of granite sawing mud, 10% -15% of tailings, 8% -15% of fly ash, 10% -15% of carbide slag powder, 20% -30% of cement, 0.5% -1% of a foaming agent, 0.5% -2% of a water reducer, 1% -2% of a polymer composite material and the balance of water. The porous high-water-storage expansion ceramic sand prepared by utilizing industrial wastes has high cylinder pressure intensity and stable pore structure; the good spherical particle shape increases the fluidity of the concrete and reduces the pumping resistance; the high water storage capacity plays a role in internal curing, increases the later strength of concrete, and simultaneously combines the self-expansion effect, so that the shrinkage of the concrete is reduced to the maximum extent and the cracking of the concrete is inhibited.
Description
Technical Field
The invention belongs to the field of building material concrete additives, and particularly relates to a porous high-expansion ceramic sand crack resistance agent for concrete and a preparation method thereof.
Background
Along with the continuous improvement of the national economic level, the additive technology in the building industry is increasingly abundant, and the industry is obviously aware of the importance of the durability of the concrete on the service of the building, wherein the cracking resistance of the concrete is still an urgent problem to be solved. It is widely believed that concrete has higher compressive strength, but low tensile strength, resulting in poor deformability and poor crack resistance, causing building leakage, accelerating corrosion damage to the reinforcing steel bars, and seriously affecting the safety and service life of the concrete structure.
At present, the commercial concrete has poor sand aggregate gradation and large mud powder content, so that the defect of the concrete non-uniform mass is aggravated, the concrete fluidity is poor, the loss with time is large, and the crack resistance and the durability of the concrete are seriously affected.
The recycling of a large amount of mineral wastes such as tailings, slag and the like is difficult, so that a large amount of resources are wasted and environmental pollution is caused.
Therefore, the recycling of mineral wastes to prepare anti-cracking agents with good performance is of great significance in both cost control and environmental protection.
Disclosure of Invention
Aiming at the technical problems, the invention aims to provide the porous high-expansion ceramic sand cracking resistant agent for concrete and a preparation method thereof, and the porous high-expansion ceramic sand cracking resistant agent can improve the fluidity of the concrete and reduce the slump loss of the concrete by utilizing good spherical particles of the ceramic sand. The cracking resistance agent can obviously improve the concrete performance, improve the concrete cracking resistance, save the unilateral manufacturing cost of the concrete, increase the concrete mass stability and reduce the concrete shrinkage, thereby solving the problem of concrete cracks; the method can also realize the recycling of industrial wastes, and has very important promotion significance for energy-saving and environment-friendly construction.
In order to solve the technical problems, the technical scheme provided by the invention is as follows:
in a first aspect, the invention provides a porous high-expansion ceramic sand cracking resistant agent for concrete, which comprises the following components in percentage by weight:
20-30% of composite expanding agent, 15-25% of granite sawing mud, 10-15% of tailings, 8-15% of fly ash, 10-15% of carbide slag powder, 20-30% of cement, 0.5-1% of foaming agent, 0.5-2% of water reducer, 1-2% of polymer composite material and the balance of water.
Further, the composite expanding agent comprises the following components in percentage by weight: 25-40% of magnesium oxide, 40-60% of calcium oxide and 10-25% of calcium sulfoaluminate.
Further, the content of silicon dioxide in the granite sawing mud is more than or equal to 55%, the water content is less than or equal to 20%, and the mud content is less than or equal to 5%.
Further, the specific surface area of the carbide slag powder is more than or equal to 400m 2 /m 3 The content of calcium is more than or equal to 50 percent.
Further, the cement is selected from one or more of ordinary Portland cement, pozzolanic Portland cement, slag Portland cement and fly ash Portland cement.
Further, the foaming agent is selected from sodium abietate, tea saponin and polyethylene glycol foaming agents.
Further, the water reducer is an anti-mud type polycarboxylic acid type water reducer.
Further, the polymer composite material is a graft copolymer of cellulose, acrylamide and acrylic acid.
Further, the preparation method of the polymer composite material comprises the following steps:
(1) Heating hydroxypropyl methyl cellulose water solution, adding potassium persulfate, and stirring completely to obtain component A;
(2) And adding acrylic acid and acrylamide into the component A, and heating for reaction to obtain the polymer composite material with two full-hydrophilic grafted side chains.
Further, the mass percentage of the hydroxypropyl methylcellulose in the hydroxypropyl methylcellulose aqueous solution is 20%; the reaction temperature is 60-65 ℃.
In a second aspect, the present invention provides a method for preparing the anti-cracking agent according to the first aspect, comprising the steps of:
step one: uniformly mixing a composite expanding agent, granite sawing mud, tailings, fly ash, carbide slag powder, cement and a foaming agent, controlling the flow state of the mixture by adjusting the dosage of water, a water reducing agent and a polymer composite material, preparing green pellets by an extrusion or disc balling method, and controlling the grain size to be 0.5-5mm;
step two: and (3) qualitatively shaping the green pellets in the first step at 100-300 ℃, then placing the green pellets in 950-1000 ℃ for drying for 3-5 h, then transferring the green pellets into an incubator, and cooling the green pellets to normal temperature at a speed of 3-5 ℃/h.
The beneficial effects of the invention are as follows:
1. the porous high-expansion ceramic sand cracking resistant agent for concrete and the preparation method thereof have the main advantages that firstly, the good spherical particles of the ceramic sand are utilized to improve the fluidity of the concrete, the usage amount of the water reducing agent is reduced, and the unilateral manufacturing cost of the concrete is saved; secondly, the porous structure of the ceramic sand is combined with the hydrophilic characteristic of the polymer composite material, so that a part of water can be stored, the early-stage absorbed water is slowly released, the slump loss of concrete is reduced, the construction smoothness is ensured, the later-stage water is slowly released, a water source is provided for the internal maintenance of the concrete and the continuous hydration of the expanding agent, the expanding agent is fully hydrated, and the expansion energy storage is increased; thirdly, the shrinkage-compensating concrete is prepared by utilizing the expansion characteristic of the ceramic sand, the expansion prestress can resist the shrinkage stress caused by the concrete volume, the stability of the concrete volume is increased, and the shrinkage of the concrete is reduced as a whole, so that the problem of concrete cracks is solved; fourth, the industrial waste is recycled, so that the environmental pollution source can be reduced, the cost is reduced, and the resource utilization rate is improved; meanwhile, the high water storage ceramic sand is connected with the cement-based interface more tightly, the weak area of the interface is reduced, and the non-homogeneous characteristic of the concrete can be well solved.
2. The preparation method provided by the invention has the advantages of simple preparation process, easiness in adjustment and convenience in industrial application.
Detailed Description
For a better understanding of the present invention, the following examples are further illustrative of the present invention, but the contents of the present invention are not limited to the following examples only.
Example 1
The porous high-expansion ceramic sand crack resistant agent for the concrete comprises the following components in percentage by weight: 20% of a composite expanding agent, 20% of granite sawing mud, 10% of tailings, 10% of fly ash, 10% of carbide slag powder, 25% of cement, 3% of water, 0.5% of a foaming agent, 0.5% of a water reducer and 1% of a polymer composite material.
The composite expanding agent comprises the following components in percentage by weight: 30% of magnesium oxide, 50% of calcium oxide and 20% of calcium sulfoaluminate.
The granite sawing mud contains 60% of silicon dioxide, 10% of water content and 5% of mud content.
The specific surface area of the carbide slag powder is 400m 2 /m 3 The calcium content is 50%.
The cement is ordinary silicate cement.
The foaming agent is tea saponin.
The water reducer is an anti-mud type polycarboxylic acid type water reducer.
The preparation method of the polymer composite material comprises the following steps:
(1) Placing 20%wt of hydroxypropyl methyl cellulose aqueous solution into a four-mouth bottle with a stirrer, and heating to 60-65 ℃; introducing potassium persulfate for 5 times, and continuously stirring for 4 hours to obtain a component A;
(2) Slowly dripping acrylic acid and acrylamide solution into the component A, controlling the speed to be 10ml/h, and keeping the speed for 2h at 65 ℃ to obtain the polymer composite material.
The preparation process of porous high expansion ceramic sand cracking resistance agent for concrete includes the following steps.
(1) Uniformly mixing the mixture in a stirrer after metering 20% of the composite expanding agent, 20% of granite sawing mud, 10% of tailings, 10% of fly ash, 10% of carbide slag powder, 25% of cement and 0.5% of foaming agent;
(2) Controlling the state of the mixture by using 0.5% of water reducer and 1% of polymer, adjusting the humidity by using 3% of water, and preparing green pellets by a disc balling method, wherein the particle size is controlled to be 0.5-5mm;
(3) And (3) qualitatively forming the green pellets prepared in the step (2) at 100 ℃, preventing the green pellets from being bonded and agglomerated, drying the green pellets at 1000 ℃ for 3 hours, then transferring the green pellets into an insulation box, cooling the green pellets to normal temperature at a speed of 3 ℃/h, thus finishing high-water-storage expansion ceramic sand, drying other batches of green pellets to qualitatively form according to the principle of energy recycling, and then performing a subsequent drying process.
Example 2
The porous high-expansion ceramic sand crack resistant agent for the concrete comprises the following components in percentage by weight: 25% of a composite expanding agent, 20% of granite sawing mud, 10% of tailings, 8% of fly ash, 10% of carbide slag powder, 22% of cement, 3% of water, 0.5% of a foaming agent, 0.5% of a water reducer and 1% of a polymer composite material.
The composite expanding agent comprises the following components in percentage by weight: 30% of magnesium oxide, 50% of calcium oxide and 20% of calcium sulfoaluminate.
The granite sawing mud contains 60% of silicon dioxide, 10% of water content and 5% of mud content.
The specific surface area of the carbide slag powder is 400m 2 /m 3 The calcium content is 50%.
The cement is ordinary silicate cement.
The foaming agent is tea saponin.
The water reducer is an anti-mud type polycarboxylic acid type water reducer.
The preparation method of the polymer composite material comprises the following steps:
(1) Placing 20%wt of hydroxypropyl methyl cellulose aqueous solution into a four-mouth bottle with a stirrer, and heating to 60-65 ℃; introducing potassium persulfate for 5 times, and continuously stirring for 4 hours to obtain a component A;
(2) Slowly dripping acrylic acid and acrylamide solution into the component A, controlling the speed to be 10ml/h, and keeping the speed for 2h at 65 ℃ to obtain the polymer composite material.
A porous high-expansion ceramic sand cracking resistant agent for concrete and a preparation method thereof specifically comprise the following steps.
(1) Uniformly mixing the mixture in a stirrer after metering 25% of a composite expanding agent, 20% of granite sawing mud, 10% of tailings, 8% of fly ash, 10% of carbide slag powder, 22% of cement and 0.5% of a foaming agent;
(2) Controlling the state of the mixture by using 0.5% of water reducing agent and 1% of polymer composite material, adjusting the humidity by using 3% of water, and preparing green pellets by a disc balling method, wherein the grain diameter is controlled to be 0.5-5mm;
(3) And (3) qualitatively forming the green pellets prepared in the step (2) at 100 ℃, preventing the green pellets from being bonded and agglomerated, drying the green pellets for 3-5 hours at 1000 ℃, then transferring the green pellets into an insulation box, cooling the green pellets to normal temperature at a speed of 3 ℃/h, thus finishing the high water storage expansion ceramic sand, drying the green pellets of other batches to qualitative form by using the cooling waste heat according to the principle of recycling energy, and then performing a subsequent drying process.
Example 3
The porous high-expansion ceramic sand crack resistant agent for the concrete comprises the following components in percentage by weight: 20% of a composite expanding agent, 20% of granite sawing mud, 10% of tailings, 10% of fly ash, 10% of carbide slag powder, 25% of cement, 2.5% of water, 1% of a foaming agent, 0.5% of a water reducing agent and 1% of a polymer composite material.
The raw material components of the composite expanding agent comprise three combinations of 30% of magnesium oxide, 50% of calcium oxide and 20% of calcium sulfoaluminate.
The granite sawing mud contains 60% of silicon dioxide, 10% of water content and 5% of mud content.
The specific surface area of the carbide slag powder is 400m 2 /m 3 The calcium content is 50%.
The cement is ordinary silicate cement.
The foaming agent is tea saponin.
The water reducer is an anti-mud type polycarboxylic acid type water reducer.
The preparation method of the polymer composite material comprises the following steps:
(1) Placing 20%wt of hydroxypropyl methyl cellulose aqueous solution into a four-mouth bottle with a stirrer, and heating to 60-65 ℃; introducing potassium persulfate for 5 times, and continuously stirring for 4 hours to obtain a component A;
(2) Slowly dripping acrylic acid and acrylamide solution into the component A, controlling the speed to be 10ml/h, and keeping the speed for 2h at 65 ℃ to obtain the polymer composite material.
The preparation process of porous high expansion ceramic sand cracking resistance agent for concrete includes the following steps.
(1) Uniformly mixing the materials in a stirrer after metering 20% of the composite expanding agent, 20% of granite sawing mud, 10% of tailings, 10% of fly ash, 10% of carbide slag powder, 25% of cement and 1% of foaming agent;
(2) Controlling the state of the mixture by using 0.5% of water reducer and 1% of polymer composite material, adjusting the humidity by using 2.5% of water, and preparing green pellets by a disc balling method, wherein the particle size is controlled to be 0.5-5mm;
(3) And (3) qualitatively forming the green pellets prepared in the step (2) at 100 ℃ to prevent the green pellets from being bonded into clusters, drying the green pellets for 3-5 hours at 1000 ℃, then transferring the green pellets into an insulation box, cooling the green pellets to normal temperature at a speed of 3 ℃/h to finish high-water-storage expansion ceramic sand, drying the green pellets of other batches to form qualitative by using cooling waste heat according to an energy recycling principle, and then performing a subsequent drying process.
Example 1 differs from example 2 mainly in the expansion agent ratio, and example 1 differs from example 3 mainly in the blowing agent ratio.
The comparative example 1 is different from the example in that the components do not contain an expanding agent and a foaming agent, and the raw materials comprise 30% of granite sawing mud, 15% of tailings, 10% of fly ash, 10% of carbide slag powder, 30% of cement, 3% of water, 1% of water reducing agent and 1% of polymer composite material.
Comparative example 2 differs from the example in that the polymer composite in the component is only ordinary cellulose.
Examples 1-3 a porous high expansion ceramic sand crack resistance agent for concrete, a preparation method thereof and performance indexes of comparative example 1 are shown in tables 1-3.
TABLE 1 porous high expansion ceramic sand crack resistance index
Note that: limited swell ratio 20% by volume substitution test
TABLE 2 Total cracking area per unit area of concrete (Flat plate method)
| Name of the name | Example 1 | Example 2 | Example 3 | Comparative example 1 | Comparative example 2 |
| Total area of cracking (mm) 2 /m 2 ) | 80 | 65 | 31 | 286 | 260 |
By comparing the water absorption relations of the table 1 and the table 2, the water absorption of the ceramsite added with the polymer composite material is obviously higher than that of the common cellulose ceramsite; compared with the expansion relation, the ceramsite with the expanding agent has stronger capability of resisting the shrinkage of the concrete than the ceramsite without the expanding agent, and can reduce the shrinkage of the concrete under the post-drying condition. In the whole, the anti-cracking agent prepared by the invention is obviously superior to common ceramic sand in water absorption, concrete expansion rate and concrete anti-cracking property.
While the invention has been described with respect to the preferred embodiments, it will be understood that the invention is not limited thereto, but is capable of modification and variation without departing from the spirit of the invention, as will be apparent to those skilled in the art.
Claims (7)
1. The porous high-expansion ceramic sand crack resistant agent for the concrete is characterized by comprising the following components in percentage by weight:
20-30% of a composite expanding agent, 15-25% of granite sawing mud, 10-15% of tailings, 8-15% of fly ash, 10-15% of carbide slag powder, 20-30% of cement, 0.5-1% of a foaming agent, 0.5-2% of a water reducing agent, 1-2% of a polymer composite material and the balance of water;
the polymer composite material is a graft copolymer of cellulose, acrylamide and acrylic acid;
the preparation method of the anti-cracking agent comprises the following steps:
step one: uniformly mixing a composite expanding agent, granite sawing mud, tailings, fly ash, carbide slag powder, cement and a foaming agent, controlling the flow state of the mixture by adjusting the dosage of water, a water reducing agent and a polymer composite material, preparing green pellets by an extrusion or disc balling method, and controlling the grain size to be 0.5-5mm;
step two: and (3) qualitatively shaping the green pellets in the first step at 100-300 ℃, then placing the green pellets in 950-1000 ℃ for drying for 3-5 h, then transferring the green pellets into an incubator, and cooling the green pellets to normal temperature at a speed of 3-5 ℃/h.
2. The anticracking agent of claim 1, wherein: the composite expanding agent comprises the following components in percentage by weight: 25-40% of magnesium oxide, 40-60% of calcium oxide and 10-25% of calcium sulfoaluminate.
3. The anticracking agent of claim 1, wherein: the content of silicon dioxide in the granite sawing mud is more than or equal to 55%, the water content is less than or equal to 20%, and the mud content is less than or equal to 5%.
4. The anticracking agent of claim 1, wherein: the cement is selected from one or more of ordinary Portland cement, pozzolanic Portland cement, slag Portland cement and fly ash Portland cement.
5. The anticracking agent of claim 1, wherein: the foaming agent is selected from sodium abietate, tea saponin and polyethylene glycol foaming agents.
6. The anticracking agent of claim 1, wherein said polymer composite is prepared by the process comprising:
(1) Heating hydroxypropyl methyl cellulose water solution, adding potassium persulfate, and stirring completely to obtain component A;
(2) And adding acrylic acid and acrylamide into the component A, and heating for reaction to obtain the polymer composite material with two full-hydrophilic grafted side chains.
7. The anticracking agent according to claim 6, wherein the mass percentage of hydroxypropyl methylcellulose in the aqueous hydroxypropyl methylcellulose solution is 20%; the reaction temperature is 60-65 ℃.
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| CN106495731B (en) * | 2016-11-30 | 2020-10-09 | 青岛易生态环保科技有限公司 | Ceramsite produced by taking sludge in rivers and lakes and shell powder as raw materials and preparation method thereof |
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| CN102173629A (en) * | 2011-01-25 | 2011-09-07 | 河海大学 | Volume stabilizer of cement-based materials and application method thereof |
| CN102390951A (en) * | 2011-08-10 | 2012-03-28 | 中国铁道科学研究院铁道建筑研究所 | Internal curing material of high-performance concrete and preparation method thereof |
| CN107445646A (en) * | 2017-09-08 | 2017-12-08 | 济南大学 | A kind of granite waste stone dust haydite and preparation method thereof |
| CN111116210A (en) * | 2019-12-30 | 2020-05-08 | 同济大学 | Method for preparing light ceramsite by utilizing biological coal ecological sintering waste soil |
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