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Anti-cracking recycled concrete and preparation method thereof

A technology for recycled concrete and anti-cracking, applied in the field of concrete, can solve problems such as poor crack resistance, and achieve the effects of improving mechanical properties, crack resistance, compressive strength, and crack resistance.

Pending Publication Date: 2021-10-08
叶智勇
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to improve the defect of poor crack resistance of existing recycled concrete, the application provides a kind of anti-crack recycled concrete and its preparation method, adopting the following technical scheme:

Method used

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  • Anti-cracking recycled concrete and preparation method thereof

Examples

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Effect test

preparation example 1

[0041] (1) Take 2 kg of aluminum nitrate solution and 0.1 kg of aluminum isopropoxide particles, stir and mix, grind and disperse, collect the dispersed slurry and stir and hydrolyze to obtain aluminum source hydrolyzate;

[0042] (2) Mix 3kg tetraethyl orthosilicate with 10kg water, adjust the pH to 6.0 with glacial acetic acid, stir and hydrolyze to obtain silicon source hydrolyzate;

[0043] (3) Mix 1 kg of silicon source hydrolyzate with 2 kg of aluminum source hydrolyzate and place it at 60°C for heat preservation polycondensation reaction, use glacial acetic acid to adjust the pH to 2.5, heat heat and stir for entanglement treatment, let it stand and cool to room temperature, and the obtained product can be prepared Si-alumina composite sol 1.

preparation example 2

[0045] (1) Take 3 kg of aluminum nitrate solution and 0.2 kg of aluminum isopropoxide particles, stir and mix, grind and disperse, collect the dispersed slurry and stir and hydrolyze to obtain aluminum source hydrolyzate;

[0046] (2) Mix 4kg tetraethyl orthosilicate with 12kg water, adjust the pH to 6.0 with glacial acetic acid, stir and hydrolyze to obtain silicon source hydrolyzate;

[0047] (3) Mix 1 kg of silicon source hydrolyzate with 2 kg of aluminum source hydrolyzate and place it at 70°C for heat preservation polycondensation reaction, use glacial acetic acid to adjust the pH to 2.7, heat heat and stir for entanglement treatment, let it stand and cool to room temperature, and the obtained product can be prepared Si-alumina composite sol 2.

preparation example 3

[0049] (1) Take 3 kg of aluminum nitrate solution and 0.2 kg of aluminum isopropoxide particles, stir and mix, grind and disperse, collect the dispersed slurry and stir and hydrolyze to obtain aluminum source hydrolyzate;

[0050] (2) Mix 5kg tetraethyl orthosilicate with 15kg water, adjust the pH to 6.0 with glacial acetic acid, stir and hydrolyze to obtain silicon source hydrolyzate;

[0051] (3) Mix 1 kg of silicon source hydrolyzate with 3 kg of aluminum source hydrolyzate and place it at 80°C for heat preservation polycondensation reaction, use glacial acetic acid to adjust the pH to 3.0, heat heat and stir for entanglement treatment, let it stand and cool to room temperature, and the obtained product can be prepared Si-alumina composite sol 3.

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Abstract

The invention relates to the field of concrete, and particularly discloses anti-cracking recycled concrete and a preparation method thereof. A waterproof and corrosion-resistant wood board for a laboratory fume hood is prepared from 55-60 parts of cement, 20-30 parts of water, 25-30 parts of fly ash, 0.2-0.4 parts of cellulose ether, 6-8 parts of entangled fibers, 3-5 parts of SiO2 aerogel particles and 80-100 parts of recycled aggregate; The entangled fibers are prepared by mixing wollastonite fibers and polypropylene fibers according to a mass ratio of 1: (6-8). The preparation method comprises the following preparation steps of: S1, coating modification of recycled aggregate; S2, premixing treatment; and S3, mixing again. According to the recycled concrete, wollastonite fibers and polypropylene fibers are entangled and compounded and are mutually lapped to form a three-dimensional network, the three-dimensional network and a concrete aggregate structure jointly resist the action of shear force, and the anti-cracking strength of the recycled concrete material is improved.

Description

technical field [0001] The application relates to the field of concrete, and more specifically, it relates to a crack-resistant recycled concrete and a preparation method thereof. Background technique [0002] Recycled concrete means that waste concrete blocks are crushed, cleaned and graded, mixed with gradation in a certain proportion, partially or completely replaced by natural aggregates (mainly coarse aggregates) such as sand and gravel, and then added with cement, water, etc. new concrete. [0003] Effective recycling of waste concrete to replace natural aggregates is an inevitable choice for saving energy and protecting the environment. Its significance lies in: first, it can play a role in protecting the ecological environment of the aggregate production area; second, it can help solve a series of problems caused by waste stacking. [0004] However, since recycled concrete is processed from waste concrete, its surface is covered with hardened cement slurry, and new...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/00
CPCC04B28/00C04B2111/343C04B18/167C04B18/08C04B16/0633C04B14/465C04B14/064C04B24/383
Inventor 叶智勇
Owner 叶智勇
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