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Recycled concrete with excellent crack resistance and preparation method thereof

A technology of recycled concrete and crack resistance, applied in the direction of climate sustainability, sustainable waste treatment, solid waste management, etc., can solve the problems of poor crack resistance of recycled concrete, reduced mixing free water, and increased water absorption of sand and gravel and other problems, to achieve excellent crack resistance, good hydrophobic effect, and improve the effect of structural density

Active Publication Date: 2022-05-24
深圳市宝金华混凝土有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Due to the large external force in the crushing process of waste concrete blocks, it is easy to cause many micro-cracks on the surface of the sand and gravel. The formation of micro-cracks not only affects the strength of the sand and gravel itself, but also increases the water absorption of the sand and gravel; As the water absorption rate increases, the amount of free water in mixing decreases, making the internal structure of the concrete looser and less hard, which leads to poor crack resistance of recycled concrete.

Method used

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  • Recycled concrete with excellent crack resistance and preparation method thereof
  • Recycled concrete with excellent crack resistance and preparation method thereof
  • Recycled concrete with excellent crack resistance and preparation method thereof

Examples

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Effect test

preparation example 1

[0043] Preparation Example 1: The modified regenerated aggregate was prepared by the following method:

[0044] ① After the waste concrete blocks are crushed, cleaned and classified, recycled aggregates are obtained. The weight ratio of recycled sand and recycled crushed stones in the recycled aggregates is 1:1.5, the particle size of the recycled sand is 3mm, and the particle size of the recycled crushed stones is 8mm. ;

[0045] ②Weigh 100kg of recycled aggregates and soak them in 125kg sodium lauroyl sarcosinate solution for 3 minutes. The sodium lauroyl sarcosinate solution is an aqueous solution of sodium lauroyl sarcosinate with a mass fraction of 1%. After soaking, the speed is 110r / min. Stir for 5 minutes, then take out the recycled aggregate, drain the excess water, and obtain the loaded aggregate;

[0046] 3. Weigh lecithin and add it to hydrogenated castor oil, stirring and dissolving, to obtain a lecithin solution with a mass fraction of 5%; placing the loaded agg...

preparation example 2

[0047] Preparation Example 2: The modified regenerated aggregate was prepared by the following method:

[0048] ① After the waste concrete blocks are crushed, cleaned and classified, recycled aggregates are obtained. The weight ratio of recycled sand and recycled crushed stones in the recycled aggregates is 1:1.5, the particle size of the recycled sand is 3mm, and the particle size of the recycled crushed stones is 8mm. ;

[0049] ②Weigh 100kg of recycled aggregates and soak them in 125kg sodium lauroyl sarcosinate solution for 1 min. The sodium lauroyl sarcosinate solution is an aqueous solution of sodium lauroyl sarcosinate with a mass fraction of 2%. After soaking, the rotating speed is 110 r / min. Stir for 5 minutes, then take out the recycled aggregate, drain the excess water, and obtain the loaded aggregate;

[0050] 3. Weigh lecithin and add it to hydrogenated castor oil and stir to dissolve to obtain a lecithin solution with a mass fraction of 1%; the loaded aggregate ...

preparation example 3

[0051] Preparation Example 3: The modified regenerated aggregate was prepared by the following method:

[0052] ① After the waste concrete blocks are crushed, cleaned and classified, recycled aggregates are obtained. The weight ratio of recycled sand and recycled crushed stones in the recycled aggregates is 1:1.5, the particle size of the recycled sand is 3mm, and the particle size of the recycled crushed stones is 8mm. ;

[0053] ②Weigh 100kg of recycled aggregates and soak them in 125kg sodium lauroyl sarcosinate solution for 5 minutes. The sodium lauroyl sarcosinate solution is an aqueous solution of sodium lauroyl sarcosinate with a mass fraction of 0.5%. After soaking, the speed is 110 r / min. Stir for 5 minutes, then take out the recycled aggregate, drain the excess water, and obtain the loaded aggregate;

[0054] 3. Weigh lecithin and add it to hydrogenated castor oil and stir to dissolve to obtain a lecithin solution with a mass fraction of 10%; the loaded aggregate is...

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Abstract

The invention relates to the field of recycled materials, and particularly discloses recycled concrete with excellent crack resistance and a preparation method thereof. The recycled concrete with excellent crack resistance is prepared from the following raw materials in parts by weight: cement, modified recycled aggregate, natural aggregate, fly ash, silica fume, a filler, composite fibers, an additive and water, the modified regenerated aggregate is prepared by sequentially modifying regenerated aggregate with a sodium lauroyl sarcosinate solution and a lecithin solution; the preparation method comprises the following steps: uniformly mixing and stirring the cement, the modified regenerated aggregate and the natural aggregate, then adding the fly ash and the silica fume, and continuously and uniformly stirring to prepare a primary mixture; adding the filler and the composite fiber into the primary mixture, uniformly mixing and stirring, then adding the additive and the water, and uniformly mixing and stirring to obtain a mixed material; and pouring, curing and demolding the mixed material to obtain the finished product concrete. The effect of excellent crack resistance is achieved.

Description

technical field [0001] The present application relates to the field of recycled materials, more particularly, to a recycled concrete with excellent crack resistance and a preparation method thereof. Background technique [0002] Recycled concrete refers to the new concrete prepared by crushing, cleaning and grading waste concrete blocks, mixing them with grading in a certain proportion, replacing part or all of natural aggregates such as sand and gravel, and then adding cement and water. [0003] Due to the large external force in the crushing process of waste concrete blocks, it is easy to cause many micro-cracks on the surface of the sand-stone blocks. The formation of micro-cracks not only affects the strength of the sand-gravel material itself, but also increases the water absorption rate of the sand-gravel material; When the water absorption rate increases, the amount of free water in mixing decreases, which makes the internal structure of the concrete looser and the ha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/00C04B20/02C04B18/16C04B16/06
CPCC04B28/00C04B20/023C04B18/167C04B16/0625C04B16/0675C04B2201/50C04B14/02C04B18/08C04B18/146C04B2103/0068Y02W30/91
Inventor 钟晓升
Owner 深圳市宝金华混凝土有限公司
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