High-strength recycled concrete and preparation method thereof

A recycled concrete, high-strength technology, applied in sustainable waste treatment, solid waste management, climate sustainability, etc. Reduced impact, reduced disposal costs, increased viscosity

Active Publication Date: 2021-04-09
东莞市建业混凝土有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The presence of cement mortar in the recycled aggregate will make the porosity of the recycled aggregate larger again. When the recycled aggregate contains micro-cracks and the recycled aggregate has a large porosity, the recycled aggregate is the main component of recycled concrete. Material, when the recycled concrete is subjected to temperature stress after solidification, the internal force will be uneven, resulting in a decrease in the strength of the concrete

Method used

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

Examples

Experimental program
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Effect test

preparation example 1

[0050] Step 1: Sorting, crushing, and magnetically separating waste concrete to obtain waste concrete block a with a particle size of less than 40 mm;

[0051] Step 2: Stir-fry the waste concrete block a at 180°C for 24 hours, and then soak it in water at 25°C for 3 days, then stir continuously for 8 hours to obtain the waste concrete block b;

[0052] Repeat step 2 3 times until the particle size of the waste concrete block b is less than 25mm, to obtain the waste concrete block c;

[0053] Step 3: After raising the temperature of the waste concrete block c to 190°C, add molten styrene-butadiene rubber, stir until the waste concrete block c is covered with molten styrene-butadiene rubber, and then sprinkle cement so that the waste concrete blocks do not stick together, and obtain Abandoned concrete block d;

[0054] Step 4: Sieve the waste concrete block d, wherein the waste concrete block e whose particle size ranges from 5-20 mm and is continuously graded is recycled coars...

preparation example 2

[0056] Step 1: Sorting, crushing, and magnetically separating waste concrete to obtain waste concrete block a with a particle size of less than 40 mm;

[0057] Step 2: Stir-fry the waste concrete block a at 200°C for 22 hours, soak in water at 20°C for 3 days, and stir continuously for 10 hours to obtain the waste concrete block b;

[0058] Repeat step 2 3 times until the particle size of the waste concrete block b is less than 25mm, to obtain the waste concrete block c;

[0059] Step 3: After raising the temperature of the waste concrete block c to 180°C, add molten styrene-butadiene rubber, stir until the waste concrete block c is covered with molten styrene-butadiene rubber, and then sprinkle cement so that the waste concrete blocks do not stick together, and obtain Abandoned concrete block d;

[0060] Step 4: Sieve the waste concrete block d, wherein the waste concrete block e with a particle size range of 5-20 mm and continuous gradation is recycled coarse aggregate, wit...

preparation example 3

[0062] Step 1: Sorting, crushing, and magnetically separating waste concrete to obtain waste concrete block a with a particle size of less than 40 mm;

[0063] Step 2: Stir the waste concrete block a at a temperature of 210°C for 18 hours, put it into water at 22°C for 4 days, and stir continuously for 12 hours to obtain the waste concrete block b;

[0064] Repeat step two 2 times until the particle size of the waste concrete block b is less than 25mm to obtain the waste concrete block c;

[0065] Step 3: After raising the temperature of the waste concrete block c to 150°C, add molten styrene-butadiene rubber, stir until the waste concrete block c is covered with molten styrene-butadiene rubber, and then sprinkle cement so that the waste concrete blocks do not stick together, and obtain Abandoned concrete block d;

[0066] Step 4: Sieve the waste concrete block d, wherein the waste concrete block e whose particle size ranges from 5-20mm and is continuously graded is recycled ...

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Abstract

The invention relates to the technical field of recycled concrete, and particularly discloses high-strength recycled concrete and a preparation method of the high-strength recycled concrete. The high-strength recycled concrete comprises treated recycled coarse aggregate, recycled fine aggregate, a water reducer, cement and water. The preparation method comprises the following steps: premixing the recycled coarse aggregate, the cement and the water reducing agent, and adding water to obtain a pasty concrete mixture; and finally, adding the recycled fine aggregate, and uniformly stirring to obtain the high-strength recycled concrete. The waste concrete is used as aggregate of the concrete, resources are effectively saved, building waste is fully utilized, and the influence of the waste concrete on the environment is reduced. After bionic treatment is conducted on the waste concrete, the waste concrete has the structural stability and durability of natural gravel, and when the treated waste concrete serves as aggregate to prepare concrete, high compressive strength and breaking strength are achieved.

Description

technical field [0001] The application relates to the technical field of recycled concrete, more specifically, it relates to a high-strength recycled concrete and a preparation method thereof. Background technique [0002] Our country is in a period of intense economic development, followed by vigorous development of urban and rural construction. With the development of urban construction, concrete, as one of the most important contemporary civil engineering materials, is in increasing demand. Concrete uses cement as the cementitious material, sand and stone as the aggregate; it is mixed with water (may contain admixtures and admixtures) in a certain proportion and is formed by stirring. [0003] As the most basic raw material for concrete, sand and gravel aggregates are mainly sourced from natural sand and gravel. Sand and gravel are produced by natural stones in their natural state after long-term repeated impact and friction. They are non-metallic ores with a lot of imp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/00C04B40/00C04B20/04C04B20/02C04B20/12C04B18/16C04B20/00
CPCC04B28/00C04B40/0028C04B20/04C04B20/026C04B20/12C04B18/165C04B2201/50C04B2103/302C04B18/16C04B20/1033C04B20/1077C04B20/0076Y02W30/91
Inventor 王文
Owner 东莞市建业混凝土有限公司
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