Concrete aggregate recycling and modifying method

A concrete aggregate and waste concrete technology, applied in the direction of climate sustainability, sustainable waste treatment, solid waste management, etc., can solve the problem of exceeding the fineness modulus of fine aggregate, changing the particle size and gradation of recycled aggregate, The improvement of strength is limited, and the effect of reducing the water absorption rate of aggregate, reducing the crushing value of aggregate, and reducing porosity is achieved.

Inactive Publication Date: 2016-08-24
SUZHOU SICHUANGYUANBO ELECTRONICS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the acid cleaning method has a limited effect and will also introduce acid radical ions, which will affect the pH value of the attached mortar; the polymer treatment method can effectively reduce the water absorption of the recycled concrete aggregate, but the improvement of the strength is limited; silicone water repellent Soaking with water glass not only costs high, but also changes the particle size and gradation of recycled aggregates, making the fineness modulus of fine aggregates exceed the standard range

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Collection of waste concrete: pile up the waste concrete generated from the demolition of old buildings on the site, and use a breaker to separate the waste concrete so that the length*width*height dimensions of the waste concrete are not greater than 1m*0.6m*0.5m.

[0019] Use a belt conveyor to send the waste concrete into the receiving hopper at a high place; set up a crusher under the receiving hopper to receive the waste concrete from the upper receiving hopper for crushing; the broken waste concrete is introduced into the grid-type vibrating feeder, Needle-like, flaky and powdery particles are removed through grid vibration; waste concrete is introduced into a magnetic separator, and metal impurities are removed through magnetic force; waste concrete is transported to the sedimentation separation cleaning tank by a conveyor belt, and the density generated during the sedimentation and crushing process is high. The powdery impurities are separated to separate plastic...

Embodiment 2

[0025] Collection of waste concrete: pile up the waste concrete generated from the demolition of old buildings on the site, and use a breaker to separate the waste concrete so that the length*width*height dimensions of the waste concrete are not greater than 1m*0.6m*0.5m.

[0026] Use a belt conveyor to send the waste concrete into the receiving hopper at a high place; set up a crusher under the receiving hopper to receive the waste concrete from the upper receiving hopper for crushing; the broken waste concrete is introduced into the grid-type vibrating feeder, Needle-like, flaky and powdery particles are removed through grid vibration; waste concrete is introduced into a magnetic separator, and metal impurities are removed through magnetic force; waste concrete is transported to the sedimentation separation cleaning tank by a conveyor belt, and the density generated during the sedimentation and crushing process is high. The powdery impurities are separated to separate plastic...

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PUM

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Abstract

The invention discloses a concrete aggregate recycling and modifying method. According to the method, needle-like, flaky and powdery particles in waste concrete are removed by means of a grating type vibrating feeder, metal impurities are removed through a magnetic separator, high-density powdery impurities are removed and low-density plastics, wood, grass roots and bark are separated through a precipitation separation cleaning tank, the working efficiency is high, and the operation is convenient; through microorganism deposition modification treatment, the porosity of recycled aggregate is effectively reduced, and the crushing value and the water absorption of aggregate are further reduced.

Description

technical field [0001] The invention belongs to the technical field of concrete material preparation, and in particular relates to a method for recycling and modifying concrete aggregate. Background technique [0002] At present, my country's utilization of waste concrete is still in its infancy, and there is no mature production process for recycled concrete aggregates in China, resulting in serious waste. The construction waste generated by the demolition of old buildings in my country is about 50 million tons every year, of which 30%-40% is waste concrete, about 18 million tons. environment, occupying cultivated land. [0003] Processing waste concrete into recycled aggregate for the preparation of recycled concrete not only solves the problem of environmental pollution, but also realizes the reuse of resources and reduces the waste of resources and energy. However, compared with natural aggregates, there are a large number of fine cracks inside recycled aggregates, high...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B18/16C04B20/02
CPCC04B18/167C04B20/023Y02W30/91
Inventor 不公告发明人
Owner SUZHOU SICHUANGYUANBO ELECTRONICS TECH CO LTD
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