Discarded concrete reclaiming method and device

A technology of waste concrete, recycling method, applied in the direction of solid waste management, sustainable waste treatment, climate sustainability

Inactive Publication Date: 2008-08-27
LUOYANG INST OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Solve the problem of separation of stones and fine aggregates in waste concrete, and separat...

Method used

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  • Discarded concrete reclaiming method and device
  • Discarded concrete reclaiming method and device
  • Discarded concrete reclaiming method and device

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Embodiment Construction

[0013] In conjunction with the accompanying drawings, the following embodiments of the present invention are given, but not limited to the embodiments.

[0014] Such as figure 1 As shown: the process flow of this embodiment is: the waste concrete from the construction site (after removing the reinforcement, its particle size is about 400mm), is crushed by a common jaw crusher, and the maximum particle size of the machine is 50mm, and it is passed through the belt Machines, elevators, etc. are sent to the rotary screen for sorting, and they are divided into three particle sizes larger than 40mm, 5-40mm, and smaller than 5mm. The part larger than 40mm is sent back to the crusher for further crushing; the part of 5-40mm is ground to separate the firmly bonded coarse and fine aggregates to obtain clean stones of 5-25mm and fine aggregates smaller than 5mm; Part of the superfine grinding treatment.

[0015] Such as figure 2 As shown, the basic structure of the rotary screen is ...

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PUM

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Abstract

The invention discloses a recovery method of waste concrete and a device. The steps of the method comprise employing a crusher to crush waste concrete, wherein steel bars of the waste concrete are removed, the grain size of the waste concrete is about 400mm, after crushing, the largest grain size is no more than 50mm, then sending the waste concrete to a rotary sieve for selecting, selecting three grain diameters of 40mm, 5-40mm and being less than 5mm, sending a portion of waste concrete grain diameter of which is larger than 40mm to continue to crush, separating thick and fine aggregates which are bonded firmly of a portion of waste concrete grain diameter of which is 5-40mm by employing rubbing way, then obtaining 5-25mm clean gravels and fine aggregates grain diameter of which is smaller than 5mm, and a portion of waste concrete grain diameter of which is smaller than 5mm is in ultra-fine grinding treatment. The invention separates and restores original thick and fine aggregates which are bonded firmly of the waste concrete to obtain clean gravels, finely-crushing hardened mortar and a portion of stone waste, the gravels is used for thick aggregates mixed with the waste concrete, the finely-crushing hardened mortar and a portion of stone waste are grinded and processed further to produce micro powder, the micro powder is utilized as admixture of premixed concrete to instead of a portion of cement, thereby improving construction and service performance of the premixed concrete.

Description

technical field [0001] The invention belongs to the technical field of cement products-concrete. The invention mainly relates to a method and a device for recycling waste concrete. That is to effectively separate the coarse aggregates that are firmly bonded together in the waste concrete-stones and fine aggregates-hardened cement mortar, and reuse them in the newly mixed concrete. Background technique [0002] With the continuous development of science and technology, at present, the amount of waste concrete (demolished old houses and other building structures, concrete pavement, etc.) piled up and added is increasing day by day. The amount of newly added concrete has risen sharply, consuming a lot of mineral resources such as limestone. If this status quo develops for a long time, it will lead to the increasing shortage of limited mineral resources and the worsening living environment of human beings. As countries around the world pay more attention to the reuse of resou...

Claims

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Application Information

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IPC IPC(8): C04B18/16
CPCY02W30/91
Inventor 张日华刘建寿钱大行赵冬梅孙犁郭献军李琦
Owner LUOYANG INST OF SCI & TECH
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