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Waste concrete regeneration method

A waste concrete and recycled aggregate technology, applied in solid waste management, sustainable waste treatment, climate sustainability, etc., can solve fine aggregate fineness modulus exceeding, change recycled aggregate particle size and gradation, 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] Calcium hydroxide solution or calcium salt plus calcium treatment: Take recycled fine aggregate prepared from construction waste and spread it on a tray, then spray calcium hydroxide or calcium salt solution and stir evenly. The effect of calcium addition treatment depends on the solubility of calcium salt, so as to choose calcium chloride or calcium nitrate with higher solubility; the particle size of recycled fine aggregate is less than 4.75mm; define the parameter C of calcium hydroxide solution, C is the calcium hydroxide material used The ratio of the amount of carbon to the mass of the treated aggregate, the C value range is 0.1mol / kg; the solvent quality of calcium hydroxide or calcium salt solution is determined by the moisture content of the recycled aggregate during carbonization treatment, and the moisture content of the recycled aggregate is controlled at 2.4% .

[0019] CO 2 Strengthening treatment: place the recycled fine aggregate treated with calcium hy...

Embodiment 2

[0024] Calcium hydroxide solution or calcium salt plus calcium treatment: Take recycled fine aggregate prepared from construction waste and spread it on a tray, then spray calcium hydroxide or calcium salt solution and stir evenly. The effect of calcium addition treatment depends on the solubility of calcium salt, so as to choose calcium chloride or calcium nitrate with higher solubility; the particle size of recycled fine aggregate is less than 4.75mm; define the parameter C of calcium hydroxide solution, C is the calcium hydroxide material used The ratio of the amount of carbon to the mass of the treated aggregate, the C value ranges from 0.1mol / kg to 0.25mol / kg; the solvent quality of calcium hydroxide or calcium salt solution is determined by the moisture content of the recycled aggregate during carbonization, and the recycled aggregate contains water The rate is controlled at 7.5%.

[0025] CO 2 Strengthening treatment: place the recycled fine aggregate treated with calc...

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Abstract

The invention discloses a waste concrete regeneration method. By means of the provided concrete preparation method, the problem about recycling of building waste can be effectively solved, the production cycle of regenerated concrete prepared with the method is short, the porosity of recycled aggregate is effectively reduced through microorganism deposition treatment, the crushing value of the aggregate is reduced, the water absorption of the aggregate is reduced, the strength of the produced regenerated concrete can reach C50, and the performance of the concrete in all aspects is stable.

Description

technical field [0001] The invention belongs to the technical field of concrete material preparation, and in particular relates to a recycling method for waste concrete. Background technique [0002] With the vigorous development of my country's construction industry, concrete is widely used in various buildings. Concrete mixer trucks, concrete mixing stations and concrete mixing buildings and other equipment need to be cleaned and maintained frequently during production, and a large amount of waste generated is dumped as sludge, causing great waste. [0003] According to relevant statistics, about 35% of waste concrete is discharged in structural engineering in my country, and the rest is waste such as asphalt concrete. According to rough statistics, in my country alone, the waste from demolition of old buildings reaches more than 40 million tons every year, of which the amount of disintegrated old concrete is about 13.6 million tons. The discharge of waste concrete is as ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/08C04B18/16C04B20/02
CPCC04B18/167C04B20/023C04B28/08C04B7/02C04B14/06C04B14/02Y02W30/91
Inventor 不公告发明人
Owner SUZHOU SICHUANGYUANBO ELECTRONICS TECH CO LTD
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