Production method of recycled aggregates of building wastes

A technology of construction waste and production methods, applied in the field of building materials, can solve problems such as environmental secondary pollution, vegetation, groundwater impact, waste of manpower and material resources, discharge site maintenance, etc., achieve stable performance, avoid energy problems and environmental problems, and solve The effect of stacking land occupation and environmental pollution problems

Inactive Publication Date: 2015-06-03
SHENZHEN HUAWEI ENVIRONMENTAL PROTECTION BUILDINGMATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

With the development of urbanization, the discharge of construction waste in engineering construction is increasing year by year, occupying a large amount of land resources, not only wasting manpower and material resources for the maintenance of discharge sites, but also affecting vegetation and groundwater, resulting in secondary pollution of the environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A method for producing recycled aggregate from construction waste, comprising the steps of:

[0022] (a) Pre-screening: use a vibrating screen with a sieve size of 0.8mm-50mm to pre-screen the collected construction waste to screen out the muddy fines in the construction waste;

[0023] (b) Impurity removal: remove iron impurities and light impurities from the pre-screened construction waste by means of magnetic separation and winnowing supplemented by manual methods;

[0024] (c) Primary crushing: Jaw crushing and / or impact crushing is used to first crush the construction waste after removal of impurities, and crush the construction waste into block raw materials with a particle size not greater than the upper limit A1 of the particle size. Among them, the value range of A1 is 30-1000mm;

[0025] (d) Primary screening: Use a vibrating screen to perform primary screening on the construction waste obtained after primary crushing, return the construction waste with a par...

Embodiment 2

[0035] The rest of the steps are the same as in Example 1, and after the secondary crushing in step e, there is also a shaping step: through ball milling or rod milling, the edges and corners of the secondary crushing particle raw materials are removed. The reason for increasing the shaping step after step e is as follows: the one is because the particle raw material after crushing has many edges and corners, and the porosity increases, and the amount of cement slurry required when mixing concrete increases, so cutting off the edges and corners can reduce the amount of cement; two. Removing edges and corners can improve the adhesive interface between recycled aggregate and cement slurry, and increase the adhesive strength.

Embodiment 3

[0037]The rest of the steps are the same as in Example 2. After the shaping step, a washing step is also included, and the alkali content is less than or equal to 1500mg / L, the pH value is greater than or equal to 4.5, the chloride ion content is less than or equal to 1000mg / L, and the sulfate ion content is less than or equal to 4.5. Or equal to 2000mg / L of washing liquid to wash the coarse aggregate and fine aggregate. The reason for adding the water washing step after the shaping step is as follows: because the granular aggregate after shaping contains more micropowder, the water washing step is to remove excess micropowder in the coarse aggregate and fine aggregate products.

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PUM

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Abstract

The invention discloses a production method of recycled aggregates of building wastes. The method comprises the following steps: (a) pre-screening; (b) impurity removal; (c) primary crushing; (d) primary screening; (e) secondary crushing; (f) secondary screening; (g) material division; (h) mixing of the recycled aggregates; (I) homogenization and entrance into warehouse. According to the production method of the recycled aggregates of the building wastes, based on a series of treatment processes, the building wastes are manufactured into engineering dinas (also named as aggregates), so that the problems of land occupation and environment pollution caused by stacking the building wastes are solved, a large quantity of dinas for building engineering can also be provided, and the method is energy-saving and environmentally friendly; meanwhile, the problems of energy sources and environment caused in a manual dinas exploitation process also can be solved. The recycled aggregates produced by using the production method is stable in performance, and can be widely applied to construction of various kinds of building engineering and road engineering.

Description

technical field [0001] The invention relates to a building material, in particular to a production method of recycled aggregate from construction waste. Background technique [0002] Common sand and gravel are divided into natural sand and artificial sand, and natural sand is divided into river sand and sea sand. River sand is a non-metallic ore produced by natural stone in a natural state, repeatedly collided and rubbed by water for a long time, so River sand is a short-term non-renewable resource. Due to its good hardness and stable chemical properties, river sand is often used as high-quality building materials and concrete materials, and is widely used in road engineering and construction engineering. At present, due to the large amount of sand used in road and construction projects in many cities, river sand resources are close to or have been exhausted. Some cities use sea sand instead of river sand for road and construction projects. Since the salt and chloride ions...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B18/16
CPCY02W30/91
Inventor 关宇陆启政陈为武杨正松李文龙欧小凡
Owner SHENZHEN HUAWEI ENVIRONMENTAL PROTECTION BUILDINGMATERIAL
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