Method for producing regenerated aggregate and regenerated cement from discarded concrete

A technology of waste concrete and recycled aggregate, applied in solid waste management, sustainable waste treatment, climate sustainability, etc., can solve secondary pollution and other problems, and achieve the effects of protecting the environment, saving resources, and reducing costs

Inactive Publication Date: 2008-07-09
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problem of recycling waste concrete and the problem of secondary pollution in t

Method used

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Experimental program
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specific Embodiment approach 1

[0009] Specific embodiment one: in this embodiment, the method for producing recycled aggregate and recycled cement from waste concrete is realized according to the following steps: 1. Raw material pretreatment: the waste concrete is crushed first, and the block diameter of the broken concrete is the original concrete aggregate 2 to 3 times the particle size, to obtain waste concrete block materials; 2. Calcination: calcining waste concrete block materials at 750-800 ° C; 3. Post-processing: waste calcination concrete block materials After mechanical processing, separate the gravel material and cement slurry; 4. Separate the gravel material in step 3 to obtain gravel and sand after screening, and obtain recycled aggregate; 5. Separate step 3 to obtain cement slurry and silicic acid Salt cement clinker and coagulation agent are mixed, the cement slurry accounts for 50% to 70% of the total weight of cement slurry and Portland cement clinker, and the coagulation agent accounts for...

specific Embodiment approach 2

[0015] Embodiment 2: This embodiment differs from Embodiment 1 in that the calcination temperature in step 2 is 760°C. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0016] Embodiment 3: This embodiment differs from Embodiment 1 in that the calcination temperature in step 2 is 770°C. Others are the same as in the first embodiment.

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PUM

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Abstract

Disclosed is a method for producing regeneration skeletal materials and regeneration cement with abandoned concrete, which relates to a method for regeneration of the abandoned concrete. The invention resolves the recycling and utilizing problem of the abandoned concrete and the problem of producing secondary pollution in existing treatment process. The method of the invention comprises as follows that firstly, grinding and handling the abandoned concrete, secondly, calcining the abandoned concrete in the condition of 750-800 DEC G, thirdly, separating sandstone materials and grout from the lump materials of the abandoned concrete via mechanical workout, fourthly, obtaining stones, sands and regeneration skeletal materials after screen separation of the sandstone materials which are obtained by separation in the third step, fifthly, mixing the cement paste separated from the third step, silicate cement clinker and thickening time control agent to skive to obtain regenerate cement. The invention has the advantages of saving resource, protecting environment, saving energy, reducing costs, simple technology, and being not easy to make secondary pollution for environment.

Description

technical field [0001] The invention relates to a method for recycling waste concrete. Background technique [0002] Concrete is the most used structural material in the construction industry. In 2006, my country's cement output exceeded 1.2 billion tons, of which more than 40% was used to produce concrete, and the concrete output exceeded 4 billion cubic meters. The total amount of waste concrete demolished every year, waste concrete generated by engineering construction, and concrete discharged from concrete prefabricated component factories exceeds 40 million tons. The workload of cleaning and transportation is heavy, and the environmental pollution is serious. Concrete is composed of stones and sand in addition to cement. Abandoned concrete is treated as construction waste, and at the same time new resources such as minerals and clay are re-mined for the production of cement and sand and gravel materials, consuming a large amount of natural resources. The comprehensiv...

Claims

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Application Information

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IPC IPC(8): C04B14/06C04B7/24C04B7/52
CPCC04B28/04C04B18/023Y02W30/91C04B18/167C04B20/026C04B20/04C04B2103/44
Inventor 马新伟
Owner HARBIN INST OF TECH
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