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Anti-crack recycled concrete as well as preparation method and application thereof

A technology of recycled concrete and recycled fine aggregate, applied in the field of concrete, can solve the problems of easy cracking, affect the normal use function and durability, etc., to improve the poor crack resistance, enhance the toughness and strength, and enhance the crack resistance. Effect

Inactive Publication Date: 2021-07-13
上海勤超混凝土有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the above-mentioned related technologies, recycled aggregates are used to prepare recycled concrete. Although the waste concrete can be reused, the recycled concrete is prone to cracking during use, which affects its normal use function and durability.

Method used

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  • Anti-crack recycled concrete as well as preparation method and application thereof
  • Anti-crack recycled concrete as well as preparation method and application thereof
  • Anti-crack recycled concrete as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example 1

[0072] A graphene-modified basalt fiber, the preparation steps of which are: mixing basalt fiber, graphene, liquid paraffin, and silane coupling agent KH560 in a weight ratio of 1:0.02:0.05:0.05, and extruding with a twin-screw extruder For granulation, the temperature of the 5 stages of the twin-screw extruder from the feeding port to the machine head is set to 170°C, 185°C, 190°C, 190°C, 200°C in sequence, the screw speed is 200rpm, and the feeding speed is constant at 40rpm. After cooling, drying and pelletizing, graphene-modified basalt fibers are obtained. The diameter of the obtained graphene-modified basalt fibers is 8-12 μm and the length is 5-10 mm.

preparation example 2

[0074] A graphene-modified basalt fiber, the preparation steps of which are: mixing basalt fiber, graphene, liquid paraffin, and silane coupling agent KH560 in a weight ratio of 1:0.03:0.06:0.13, and extruding with a twin-screw extruder For granulation, the temperature of the 5 stages of the twin-screw extruder from the feeding port to the machine head is set to 170°C, 185°C, 190°C, 190°C, 200°C in sequence, the screw speed is 200rpm, and the feeding speed is constant at 40rpm. After cooling, drying and pelletizing, graphene-modified basalt fibers are obtained. The diameter of the obtained graphene-modified basalt fibers is 8-12 μm and the length is 5-10 mm.

preparation example 3

[0076] A graphene-modified basalt fiber, the preparation steps of which are: mixing basalt fiber, graphene, liquid paraffin, and silane coupling agent KH560 in a weight ratio of 1:0.05:0.08:0.2, and extruding with a twin-screw extruder For granulation, the temperature of the 5 stages of the twin-screw extruder from the feeding port to the machine head is set to 170°C, 185°C, 190°C, 190°C, 200°C in sequence, the screw speed is 200rpm, and the feeding speed is constant at 40rpm. After cooling, drying and pelletizing, graphene-modified basalt fibers are obtained. The diameter of the obtained graphene-modified basalt fibers is 8-12 μm and the length is 5-10 mm.

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Abstract

The invention relates to the technical field of concrete, and particularly discloses anti-crack recycled concrete as well as a preparation method and application thereof. The anti-crack recycled concrete is prepared from the following raw materials: cement, water, a water reducing agent, fine aggregate, coarse aggregate, a filler, graphene modified basalt fibers and polystyrene microspheres, wherein the fine aggregate comprises sand and recycled fine aggregate; and the coarse aggregate comprises fine stone and recycled coarse aggregate. A preparation process of the graphene modified basalt fibers comprises the following steps: mixing basalt fibers, graphene, liquid paraffin and a silane coupling agent, performing melt extrusion and granulation, and then performing cooling, blow-drying and pelletizing to obtain the graphene modified basalt fibers. The particle sizes of the polystyrene microspheres are in a range of 180-220 nm. The anti-crack recycled concrete disclosed by the invention has relatively good anti-crack and anti-compression properties.

Description

technical field [0001] This application relates to the technical field of concrete, more specifically, it relates to a crack-resistant recycled concrete, its preparation method and application. Background technique [0002] In recent years, the construction industry has entered a stage of rapid development. As the largest man-made material, the occupation of natural resources and the negative impact on the environment of concrete have also triggered discussions on sustainable development. The amount of waste concrete demolished every year in the world, waste concrete produced by new buildings, and waste concrete discharged from concrete factories and prefabricated construction plants is huge. Waste concrete is mainly disposed of by being transported to the outskirts for storage or landfill, and the amount of recycled concrete is only about 30%. [0003] In order to respond to the call for sustainable development, protect the environment, and reduce the secondary pollution ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04C04B20/02C04B20/10
CPCC04B28/04C04B20/1055C04B20/023C04B2111/343
Inventor 徐志平杨东平夏明
Owner 上海勤超混凝土有限公司
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