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Formulating method of waste concrete as recycled aggregate recovery utilization

A technology for waste concrete and recycled aggregates, which is applied in solid waste management, data processing applications, sustainable waste treatment, etc.

Inactive Publication Date: 2016-12-07
LANZHOU JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to solve the problem that the specific use and proportion cannot be determined in time when waste concrete is recycled as recycled aggregate, the present invention proposes a proportioning method for recycling waste concrete as recycled aggregate

Method used

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  • Formulating method of waste concrete as recycled aggregate recovery utilization
  • Formulating method of waste concrete as recycled aggregate recovery utilization
  • Formulating method of waste concrete as recycled aggregate recovery utilization

Examples

Experimental program
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Embodiment Construction

[0078] Source of raw materials: large pieces of concrete crushed by a breaking hammer on a certain construction site.

[0079] After the raw materials arrive in the laboratory, they are crushed to form: waste concrete contains about 30% of hardened cement mortar and about 70% of natural aggregate (pebble). Most of these cement mortars form independent blocks during the crushing process, a small amount adheres to the surface of natural aggregates, and a small amount becomes fine powder.

[0080] The crushed material is mainly composed of the following particles:

[0081] Fine aggregate with a particle size of less than 5mm mainly includes four types of particles: sand particles with cement slurry on the surface formed after the mortar body is crushed, sand particles without cement slurry on the surface, cement stone particles, and a small amount of stone powder produced during the crushing process. , accounting for about 30% of the weight of the discarded concrete blocks;

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Abstract

The invention discloses a preparation method of waste concrete as recycled aggregate recovery utilization. Firstly, waste concrete is broken, then the apparent density of aggregate is measured, the bulk density of recycled aggregate is measured, the crush index of the recycled aggregate is measured, and a screening experiment is conducted. When the recycled aggregate can be used, according to the preparation intensity of concrete and the actual strength of cement, the water cement ratio, the water consumption and the sand ratio are obtained by calculation, and finally, the usage amount of sand and cobblestone can be determined according to the volume method or the quality method, and thus the ratio of materials needed for waste concrete as recycled aggregate recovery utilization is obtained. The beneficial effects are that the method can obtain data within one or two days, and thus that whether to-be-measured materials meet requirements of recycled aggregate or not can be determined, the concrete purpose can be determined and the preparation can be conducted according to the obtained data; and manufacturers that utilize waste concrete can rapidly obtain a material available signal and then directly transport the material at a building site, so that both builders and manufacturers of recycling waste concrete can be benefited, and the enthusiasm of related companies is improved.

Description

technical field [0001] The invention belongs to the field of recycling and reuse of building demolition waste materials, and relates to a proportioning method for recycling waste concrete as recycled aggregate. Background technique [0002] In today's society, the vigorous development of the construction industry has brought a lot of construction waste to the society, and the development and utilization of recycled concrete has become a feasible trend. According to statistics, every 10,000 square meters of construction will produce 500-600 tons of construction waste. By 2012, about 50% of the urban houses in our country were built in the last century, and the demolition of these houses will generate about 700 million tons of construction waste. At present, construction waste is mostly disposed of in landfill, which will bring great harm to the future development of cities and the lives of residents. The development and utilization of recycled concrete is a good way for the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06Q50/08C04B28/04C04B18/16
CPCC04B18/16C04B28/04G06Q50/08C04B14/068Y02W30/91
Inventor 董玉云刘军生卜世龙杨林
Owner LANZHOU JIAOTONG UNIV
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