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Compact anti-cracking waterproof agent capable of inhibiting early cracking of concrete and preparation method of dense anti-cracking waterproof agent

A technology of anti-cracking and waterproofing agent and concrete, which is applied in the field of building materials, can solve the problems of inability to improve early cracking and poor concrete impermeability, and achieve the goal of improving impermeability and waterproof performance, increasing ultimate tensile strength, and enhancing impermeability Effect

Active Publication Date: 2021-05-28
WUHAN YUANJIN BUILDING MATERIALS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In view of the above deficiencies in the prior art, the present invention provides a compact anti-cracking waterproofing agent for inhibiting early cracking of concrete, which solves the technical problem of poor concrete impermeability and inability to improve early cracking in the prior art, specifically achieved through the following technologies

Method used

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  • Compact anti-cracking waterproof agent capable of inhibiting early cracking of concrete and preparation method of dense anti-cracking waterproof agent
  • Compact anti-cracking waterproof agent capable of inhibiting early cracking of concrete and preparation method of dense anti-cracking waterproof agent
  • Compact anti-cracking waterproof agent capable of inhibiting early cracking of concrete and preparation method of dense anti-cracking waterproof agent

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Effect test

Embodiment 1-3 and comparative example 1、2

[0027] Examples 1-3 and Comparative Examples 1 and 2 provide early-stage concrete cracking-inhibiting compact anti-cracking waterproofing agents, and their raw material compositions are shown in Table 1 below in parts by weight.

[0028] The compact anti-cracking waterproofing agent raw material of table 1 embodiment 1-3 and comparative example 1,2, unit: part

[0029]

[0030]

Embodiment 4

[0032] The early cracking-inhibiting concrete anti-crack waterproofing agent provided in this example has the same raw material composition as in Example 1, the difference is that the preparation method of the modified bentonite used is: first mix sodium-based bentonite with 1mol / L Fe 2 (SO 4 ) 3 The solution is mixed according to the mass ratio of 1:10, stirred at 1000r / min for 1h until the mixture is uniform, and then aged at room temperature for 24h; then the aged slurry is filtered at room temperature, washed with water, dried and cooled at 105°C, and then Grinding treatment, and finally passing the powder through a 0.075um standard sieve to obtain modified bentonite.

Embodiment 5

[0034] The early cracking-inhibiting concrete anti-crack waterproofing agent provided in this example has the same raw material composition as in Example 1, the difference is that the preparation method of the modified bentonite used is: first mix sodium-based bentonite with 1mol / L Fe 2 (SO 4 ) 3 The solution is mixed according to the mass ratio of 1:20, stirred at 1000r / min for 1h until the mixture is uniform, and then aged at room temperature for 24h; then the aged slurry is filtered at room temperature, washed with water, dried and cooled at 105°C, and then Grinding treatment, and finally passing the powder through a 0.075um standard sieve to obtain modified bentonite.

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Abstract

The invention discloses a dense anti-cracking waterproof agent for inhibiting early cracking of concrete. The dense anti-cracking waterproof agent comprises the following components in parts by weight: 20-40 parts of modified bentonite, 10-25 parts of rubber powder, 10-25 parts of urea, 10-20 parts of a retarder, 5-20 parts of calcium formate, 5-15 parts of superfine stone powder, 5-15 parts of an efficient powder shrinkage reducing agent, 4-10 parts of an organic silicon water repellent, 1-5 parts of calcium carbonate whiskers, 1-5 parts of a polycarboxylate superplasticizer and 0.05-0.1 part of an air entraining agent; wherein the modified bentonite is prepared by mixing sodium bentonite and a Fe2(SO4)3 solution in proportion, carrying out standing aging treatment at normal temperature, filtering the mixture, washing the mixture with water, and drying, grinding and sieving the mixture. On the premise that the original working performance of concrete is not influenced, the anti-crack waterproof agent can slightly improve the mechanical property of the concrete, improve the pore structure of the concrete, improve the compactness of the concrete, enhance the impermeability of the concrete, greatly reduce the risk of early cracking of the concrete and improve the ultimate tensile strength of the concrete; therefore, the anti-seepage and waterproof performance of the concrete is comprehensively improved from two aspects of compactness and crack resistance.

Description

technical field [0001] The invention belongs to the technical field of building materials, in particular to a compact anti-crack waterproofing agent for inhibiting early cracking of concrete. Background technique [0002] With the gradual acceleration of my country's urbanization process, there has been unprecedented enthusiasm for engineering construction. The appearance of urban buildings across the country is showing a trend of diversification, and the development and utilization of underground structures has become a hot issue, accompanied by waterproofing projects for building structures. Waterproofing of building structures not only involves the beauty and durability of buildings, but also has a significant impact on the safety of human life and property. As the most fundamental part of a building, concrete is a heterogeneous material with high brittleness and easy cracking. At the same time, its own characteristics of cement hydration heat release and shrinkage creat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/42C04B103/65
CPCC04B40/0039C04B2103/65C04B22/08C04B24/24C04B24/126C04B2103/22C04B24/04C04B24/42C04B14/383C04B2103/302C04B2103/304C04B22/149Y02W30/91
Inventor 程福星邓小旭王海龙向飞纪宪坤
Owner WUHAN YUANJIN BUILDING MATERIALS TECH CO LTD
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