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Recycled concrete and its preparation method

A technology of recycled concrete and waste concrete, applied in the field of concrete, can solve the problems of limiting the use range of recycled concrete, affecting the mechanical properties of recycled concrete, and high porosity of recycled coarse aggregate, and achieve excellent mechanical strength, impermeability, and excellent mechanical strength , the effect of small water absorption

Active Publication Date: 2021-06-08
西安天盛混凝土有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Compared with natural coarse aggregate, recycled coarse aggregate has high porosity and high water absorption; with the increase of water absorption of recycled coarse aggregate, the water consumption of concrete mixture is also increasing. When mixing concrete , the slump will decrease, which will affect the mechanical properties of recycled concrete; and the concrete will be broken and deformed again during the crushing process, resulting in increased surface cracks, which also leads to the use of recycled concrete made of coarse aggregate. The impermeability performance is significantly lower than that of ordinary concrete, which limits the application range of recycled concrete. Therefore, it is necessary to develop a recycled concrete with good impermeability and mechanical properties.

Method used

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  • Recycled concrete and its preparation method
  • Recycled concrete and its preparation method

Examples

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Effect test

preparation example 1

[0034] Preparation example 1 of modifier: Take 6kg of cetyltrimethoxysilane, 10kg of redispersible latex powder, 4kg of polyvinyl alcohol and 2kg of gum arabic powder, heat it up to 80°C, and then add water at 80°C 50kg, and stirred at a constant temperature at a speed of 60r / min for 20min to obtain a modifier.

preparation example 2

[0035] Preparation example 2 of modifier: Take 7kg of cetyltrimethoxysilane, 15kg of redispersible latex powder, 5kg of polyvinyl alcohol and 3kg of gum arabic powder, heat it up to 85°C, and then add water at 85°C 55kg, and stirred at a constant temperature at a speed of 70r / min for 25min to obtain a modifier.

preparation example 3

[0036]Preparation example 3 of modifier: Take 8kg of cetyltrimethoxysilane, 20kg of redispersible latex powder, 6kg of polyvinyl alcohol and 4kg of gum arabic powder, raise the temperature to 90°C, and then add water at 90°C 60kg, with constant temperature stirring at a speed of 80r / min for 30min to obtain the modifier.

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PUM

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Abstract

The invention discloses a recycled concrete and a preparation method thereof, which belong to the technical field of concrete. The key point of the technical solution is a recycled concrete, which comprises the following components in parts by weight: 340-360 parts of cement, 90-100 parts of slag powder 60-80 parts of fly ash, 1000-1150 parts of modified recycled coarse aggregate, 620-640 parts of fine aggregate, 5-7 parts of admixture and 160-170 parts of water; the modified recycled coarse aggregate It is made by crushing and screening waste concrete, physical strength and chemical modification. The modified regenerated coarse aggregate obtained after the waste concrete of the present invention is modified has excellent mechanical strength, low porosity and small water absorption, and is composed of modified regenerated coarse aggregate, cementitious material, fine bone The recycled concrete made of raw materials and admixtures has excellent mechanical strength and impermeability.

Description

technical field [0001] The invention relates to the technical field of concrete, more specifically, it relates to a recycled concrete and a preparation method thereof. Background technique [0002] Concrete is the building material with the largest consumption in the field of civil engineering. In recent years, with the development of urban construction, a large amount of waste concrete is produced every year in my country due to the reconstruction and expansion of buildings and the maintenance and demolition of old buildings; these Most of the waste concrete is piled up near the roads and rivers in the suburbs of the city, which not only occupies land resources, but also affects the ecological environment. In this regard, people began to develop and utilize recycled concrete. [0003] Recycled concrete refers to new concrete made by crushing, cleaning and grading discarded concrete blocks, mixing them with grading in a certain proportion, replacing part or all of natural agg...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/00C04B20/12C04B20/04C04B20/02C04B18/16C04B111/27C04B111/20
CPCY02W30/91
Inventor 秦磊
Owner 西安天盛混凝土有限公司
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