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A kind of high-strength recycled concrete and its preparation method

A recycled concrete, high-strength technology, applied in the field of concrete, can solve the problems of poor strength of recycled concrete, poor concrete reinforcement effect, large surface tension of slurry, etc., to achieve increased strength, improved compactness, improved strength and corrosion resistance Effect

Active Publication Date: 2022-04-15
温州市三箭混凝土有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the mixing of one or more reinforcing components in the slurry, the consistency of the slurry is relatively large, and the surface tension of the slurry is relatively large, making it difficult for the slurry to penetrate into the relatively small pores or gaps in the filled concrete block, so that the discarded Concrete reinforcement is poor, resulting in poor strength of recycled concrete

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example 1

[0051] Preparation of nanoscale poly 3,4-diaminophenylacetic acid:

[0052] Grind 3,4-diaminophenylacetic acid, weigh 4 parts of 3,4-diaminophenylacetic acid powder by weight, add 0.5 parts of polyethylene glycol, continue grinding and mixing for 20 minutes; add 0.4 parts of ammonium persulfate, Continue grinding and mixing for 20 minutes, add 0.4 parts of ammonium persulfate again, and continue grinding for 1 hour; after grinding, place it at 50°C for 3 hours; take it out and wash it with ether, ethanol, and water in sequence, dry it at 60°C for 48 hours after washing, take it out and grind it When the average particle diameter is 50nm, nano-sized poly-3,4-diaminophenylacetic acid is obtained.

preparation example 2

[0054]Preparation of modified recycled aggregate:

[0055] S1, preparation of recycled aggregates: crushing, screening and cleaning waste concrete blocks to obtain recycled aggregates, the gradation of recycled aggregates is 5-31.5mm;

[0056] S2, Modification of recycled aggregate:

[0057] S21, soak the regenerated aggregate obtained in step S1 in modifier A, soak for 0.5h, remove and dry to obtain modified material A, modifier A is nano-sized poly 3 prepared by Preparation Example 1, The mixture of 4-diaminophenylacetic acid and water, and according to the weight ratio, nano-scale poly 3,4-diaminophenylacetic acid: water=1:7;

[0058] S22, soak modified material A in modifier B, remove and dry after soaking for 1 hour, obtain modified material B, modifier B is an aqueous solution of barium chloride, and according to the weight ratio, barium chloride: water =1:4, the pH value of modifier B was determined to be 6.8;

[0059] S23, soak the modified material B in the modifie...

preparation example 3

[0061] Preparation of modified recycled aggregate:

[0062] S1, preparation of recycled aggregates: crushing, screening and cleaning waste concrete blocks to obtain recycled aggregates, the gradation of recycled aggregates is 5-31.5mm;

[0063] S2, Modification of recycled aggregate:

[0064] S21, soak the regenerated aggregate obtained in step S1 in modifier A, soak for 0.5h, remove and dry to obtain modified material A, modifier A is nano-sized poly 3 prepared by Preparation Example 1, The mixture of 4-diaminophenylacetic acid and water, and according to the weight ratio, nano-scale poly 3,4-diaminophenylacetic acid: water=1:8;

[0065] S22, soak modified material A in modifier B, remove and dry after soaking for 1 hour, obtain modified material B, modifier B is an aqueous solution of barium chloride, and according to the weight ratio, barium chloride: water =1:6, the pH value of modifier B was determined to be 6.9;

[0066] S23, soak the modified material B in the modifi...

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PUM

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Abstract

The application relates to the field of concrete, a high-strength recycled concrete and a preparation method thereof, which are made of the following raw materials in parts by weight: cement, water, filler, coarse aggregate, fine aggregate, modified recycled aggregate, added agent. A method for preparing high-strength recycled concrete, comprising the following steps: S1, weighing cement and water and stirring and mixing uniformly to obtain cement rubber; S2, weighing filler, coarse aggregate, fine aggregate, and modified recycled aggregate , The admixture is stirred and mixed evenly to obtain high-strength recycled concrete. After the recycled aggregate is modified, the strength and corrosion resistance of the recycled concrete are improved. The recycled aggregate is irradiated with ultraviolet light, so that the barium sulfate is densely attached to the surface of the recycled aggregate, and the strength and corrosion resistance of the recycled concrete are further improved. By adjusting the pH value of the modifier B to 4-5, the barium sulfate has a better salt-forming effect, thereby improving the compactness of the recycled aggregate.

Description

technical field [0001] This application relates to the field of concrete, more specifically, it relates to a high-strength recycled concrete and its preparation method. Background technique [0002] Concrete is a widely used building material in modern times. It has the advantages of abundant raw materials, low price, simple process, high strength and good durability. [0003] Recycled concrete refers to the new concrete prepared by crushing, cleaning and grading waste concrete blocks, mixing them with gradation in a certain proportion, replacing part or all of natural aggregates such as sand and gravel, and then adding cement and water. [0004] However, during the crushing process of discarded concrete blocks, due to the action of external mechanical forces, a large number of fine cracks are prone to appear inside the concrete blocks, resulting in an increase in the porosity of the concrete blocks, which makes the density of the recycled concrete obtained from it poor, res...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/02C04B111/20
CPCC04B28/02C04B2201/50C04B2111/20C04B14/02C04B14/06C04B24/123C04B18/08C04B18/141C04B24/281C04B18/16C04B22/124C04B22/147C04B2103/0068
Inventor 陈辉黄炎孝姚芙蓉
Owner 温州市三箭混凝土有限公司