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Concrete prepared from recycled wastes and preparation process of concrete

A waste and concrete technology, applied in the field of concrete, can solve the problems of freeze-thaw damage, poor frost resistance, high water absorption of recycled aggregates, etc., to improve thermal stability, frost resistance, compressive strength and The effect of frost resistance

Active Publication Date: 2022-08-09
四川衡鼎建材有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the above-mentioned related technologies, the inventor believes that recycled aggregates have a high water absorption rate, are prone to freeze-thaw damage, and have the disadvantages of poor frost resistance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example 1

[0048] Microcapsule modified regenerated coarse aggregate, its preparation method comprises the following steps:

[0049] Pickling, put 400kg of recycled coarse aggregate into 2% glacial acetic acid solution for 1 hour, take it out, wash with water, then put it into 1.5% hydrochloric acid solution, soak for 0.5 hours, wash with water, and dry to obtain acidified aggregate;

[0050] Microcapsule filling: Disperse 10kg of paraffin phase change microcapsules in 800kg of water, add acidified aggregate, stir evenly, ultrasonic power 150w, ultrasonic treatment for 30min, filter and dry to obtain filled aggregate filled with paraffin phase change microcapsules;

[0051] Close the pores, mix the filled aggregate with an excess of 7% polyvinyl alcohol solution, stir evenly, filter, and dry to form a polyvinyl alcohol coating on the surface of the filled aggregate, and mix the dried filled aggregate with The cement slurry is mixed, stirred evenly, filtered and dried to form a cement la...

preparation example 2

[0059] Microcapsule modified regenerated coarse aggregate, its preparation method comprises the following steps:

[0060] Pickling, put 400kg of recycled coarse aggregate into a 2% mass concentration glacial acetic acid solution for 0.5h, take it out, wash with water, then put it into a 1.5% mass concentration hydrochloric acid solution for 1 h, wash with water, and dry to obtain acidified aggregate;

[0061] Microcapsule filling: Disperse 10kg of paraffin phase change microcapsules in 900kg of water, add acidified aggregate, stir evenly, ultrasonic power 200w, ultrasonic treatment for 20min, filter and dry to obtain filled aggregate filled with paraffin phase change microcapsules;

[0062] Close the pores, mix the filled aggregate with excess polyvinyl alcohol solution with a mass concentration of 7.5%, stir evenly, filter, and dry to form a polyvinyl alcohol coating on the surface of the filled aggregate, and mix the dried filled aggregate with The cement slurry is mixed, s...

preparation example 3

[0070] Microcapsule modified regenerated coarse aggregate, its preparation method comprises the following steps:

[0071] Pickling, put 400kg of recycled coarse aggregate into 2% glacial acetic acid solution for 1 hour, take it out, wash with water, then put it into 1.5% hydrochloric acid solution, soak for 0.5 hours, wash with water, and dry to obtain acidified aggregate;

[0072] Microcapsule filling: Disperse 10kg of paraffin phase change microcapsules in 1000kg of water, add acidified aggregate, stir evenly, ultrasonic power 300w, ultrasonic treatment for 15min, filter and dry to obtain filled aggregate filled with paraffin phase change microcapsules;

[0073] Close the pores, mix the filled aggregate with an excess of 8% polyvinyl alcohol solution, stir evenly, filter, and dry to form a polyvinyl alcohol coating on the surface of the filled aggregate, and mix the dried filled aggregate with The cement slurry is mixed, stirred evenly, filtered and dried to form a cement l...

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PUM

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Abstract

The invention relates to the technical field of concrete, and particularly discloses waste recycled concrete and a preparation process thereof, and the raw materials of the waste recycled concrete comprise the following components by weight: 140-170 parts of cement; 70 to 100 parts of fly ash; 80 to 110 parts of mineral powder; 850 to 1000 parts of sand; 500 to 700 parts of broken stone; 350 to 450 parts of microcapsule modified recycled coarse aggregate; 12 to 16 parts of a water reducing agent; and 150 to 170 parts of water. According to the invention, the recycled coarse aggregate is modified and then added into the concrete, and the compressive strength and the frost resistance of the recycled coarse aggregate are improved under the joint cooperation action of acid pickling, microcapsule filling and pore sealing, so that the frost resistance of the concrete is improved.

Description

technical field [0001] The invention relates to the technical field of concrete, in particular to a concrete for recycling waste and a preparation process thereof. Background technique [0002] Construction waste refers to the muck, spoil, waste material, residual mud and other wastes generated during the construction, laying, demolition and repair of various buildings, structures, and pipe networks by construction units or individuals. Recycled concrete means that after crushing, cleaning, and grading waste concrete blocks, they are mixed with grading in a certain proportion, partially or completely replacing natural aggregates such as sand and gravel (mainly coarse aggregates), and then adding cement, water, etc. new concrete. [0003] The related art discloses a recycled concrete, the raw material of which includes the following components by weight: 140-170 parts of cement; 60-90 parts of fly ash; 70-90 parts of mineral powder; 900-1000 parts of sand; crushed stone 400...

Claims

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Application Information

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IPC IPC(8): C04B28/00C04B24/36C04B18/16
CPCC04B28/00C04B40/0046C04B18/16C04B2201/50C04B18/08C04B18/12C04B14/06C04B2103/302C04B24/04C04B22/122C04B24/36C04B24/2623C04B7/00C04B14/20Y02W30/91
Inventor 向嵘明勇唐金涛任清裕
Owner 四川衡鼎建材有限公司
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