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High-strength anti-crack recycled concrete and preparation method thereof

A technology of recycled concrete and waste concrete blocks, which is applied in the field of recycled concrete, can solve the problems of reducing the service life and durability of recycled concrete, low bonding fastness of cement mortar, and easy cracking, etc., and achieves inhibition of alkali-aggregate reaction, excellent Crack resistance and service life, the effect of guaranteeing crack resistance and service life

Active Publication Date: 2022-07-29
上海汉石昀升住宅工业发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the recycled aggregate in the above-mentioned recycled concrete is only to crush the waste concrete, which is limited by the original defects of the waste concrete and its own alkalinity. The generation of void cracks will aggravate the cracking phenomenon, and then greatly reduce the service life and durability of recycled concrete

Method used

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  • High-strength anti-crack recycled concrete and preparation method thereof
  • High-strength anti-crack recycled concrete and preparation method thereof
  • High-strength anti-crack recycled concrete and preparation method thereof

Examples

Experimental program
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Effect test

preparation example 1

[0060] A modified regenerated aggregate is prepared and obtained by adopting the following steps:

[0061] a. First, the waste concrete blocks and the porous modified powder are mixed and calcined at a weight ratio of 1:0.1 at 1000 °C for 6 hours, then soaked in an oxalic acid aqueous solution with a pH of 4.5 for 30 minutes, cooled to room temperature, crushed and ground, and the particle size is less than 30mm. The crushed powder is for standby use, and in this application, it is a continuous stage crushed powder of 10-25mm;

[0062] The porous modified powder is diatomaceous earth;

[0063] b. Put the crushed powder obtained in a into the modified liquid at a weight ratio of 1:0.8, mix for 1 hour, and then dry at 600°C to obtain modified regenerated aggregate for use;

[0064] The modified liquid is composed of water and silica sol in a weight ratio of 1:0.2.

preparation example 2

[0066] A modified regenerated aggregate is prepared and obtained by adopting the following steps:

[0067] a. First, the waste concrete blocks and the porous modified powder were mixed and calcined at 1200 °C for 4 hours at a weight ratio of 1:0.1, and then soaked in an oxalic acid aqueous solution with a pH of 4.5 for 30 minutes, cooled to room temperature, and crushed and ground to obtain a particle size smaller than 30mm. of crushed powder for use;

[0068] The porous modified powder is diatomaceous earth;

[0069] b. Put the crushed powder obtained in a into the modified liquid at a weight ratio of 1:0.8, mix for 1 hour, and then dry at 600°C to obtain modified regenerated aggregate for use;

[0070] The modified liquid is composed of water and silica sol in a weight ratio of 1:0.2.

preparation example 3

[0072] A modified regenerated aggregate is prepared and obtained by adopting the following steps:

[0073] a. First, the waste concrete blocks and the porous modified powder are mixed and calcined at a weight ratio of 1:0.1 at 1500 ° C for 2 hours, then soaked in an oxalic acid aqueous solution with a pH of 2.5 for 10 minutes, cooled to room temperature, and crushed and ground to obtain a particle size of less than 30mm. of crushed powder for use;

[0074] The porous modified powder is diatomaceous earth;

[0075] b. Put the crushed powder prepared in a into the modified liquid at a weight ratio of 1:0.8, mix for 3 hours, and then dry at 800°C to obtain modified regenerated aggregate for use;

[0076] The modified liquid is composed of water and silica sol in a weight ratio of 1:0.2.

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Abstract

The invention relates to the field of recycled concrete, and particularly discloses high-strength anti-crack recycled concrete and a preparation method thereof. The high-strength anti-crack recycled concrete is characterized by comprising the following components in parts by weight: 50-60 parts of cement; 20 to 30 parts of fly ash; 100 to 110 parts of sand; 120 to 140 parts of fine stone; 20 to 30 parts of water; 100 to 120 parts of modified recycled aggregate; the modified recycled aggregate is prepared from waste concrete blocks through the processes of mixed calcination, acid pickling, crushing, modification and the like. According to the high-strength anti-crack recycled concrete disclosed by the invention, the waste concrete is modified and utilized, so that the high-strength anti-crack recycled concrete has excellent anti-crack performance while having relatively high environmental benefits and economic benefits.

Description

technical field [0001] The present application relates to the technical field of recycled concrete, and more particularly, to a high-strength anti-cracking recycled concrete and a preparation method thereof. Background technique [0002] In today's infrastructure construction, cement concrete is definitely the most important basic structural material for construction projects, and is widely used in civil engineering. Benefit and economic benefits, environmentally friendly concrete containing recycled aggregates came into being. [0003] Recycled concrete in the related art includes aggregate and cement slurry. Aggregate is composed of sand, stone, and recycled aggregate obtained by crushing and recycling waste concrete, all of which play a skeleton role; cement slurry is mixed with water and cement. , the cement slurry can be wrapped on the surface of the aggregate and the regenerated aggregate and fill the voids during the mixing and preparation process. After the cement s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04C04B18/16C04B20/04C04B24/18C04B24/16C04B103/30C04B111/34
CPCC04B28/04C04B18/16C04B20/04C04B40/0039C04B2201/50C04B2103/302C04B2111/343C04B18/08C04B14/068C04B18/12C04B20/026C04B20/023C04B24/18C04B24/16C04B24/122C04B24/06Y02W30/91
Inventor 时晗李修昌邢水建何恩军
Owner 上海汉石昀升住宅工业发展有限公司
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