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A kind of recycled concrete containing pc waste and its production process

A technology for recycled concrete and waste, applied in the field of recycled concrete, can solve the problems of inability to design mix ratios, etc., and achieve the effects of improved slump-preserving form and workability, strong embedded connection, and improved compressive strength.

Active Publication Date: 2021-03-23
SUZHOU JIASHENG YUANDA CONSTR IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In the prior art, when using recycled aggregates to prepare recycled aggregate concrete, the mix design ratio generally adopts JGJ55-2011 "Ordinary Concrete Mix Design Regulations", and this standard is only for the concrete design of ordinary aggregates. For recycled aggregates, Especially for concrete prepared with low-quality recycled aggregates, due to the particularity of recycled aggregates, the mix ratio designed according to this standard cannot be designed properly in terms of strength, water consumption, and standard deviation of concrete, especially when recycled micropowder is added. mix ratio

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A recycled concrete containing PC waste is characterized in that it comprises the following percentage components: 15wt% of cement, 40wt% of river sand, 6wt% of PC waste, 20wt% of recycled fine aggregate, polycarboxylate-based high-performance water reducing 0.4 wt % of agent, 2.5 wt % of modified fluorite powder, and water balance; it also includes 0.15 wt % of barium sulfate, 0.3 wt % of nano calcium sulfate whiskers, and 0.5 wt % of isooctyltriethoxysilane.

[0024] Cement should be any one of P.P, P.F and P.C. River sand should be medium sand with a moisture content of 6-7%. The particle size of PC waste should be less than 1mm. The particle size of recycled fine aggregate should be 1-3mm and water absorption should be less than 5%. .

[0025] The modified fluorite powder is composed of the following parts by mass: 15 parts of fluorite, 25 parts of petroleum asphalt, 4 parts of nano-scale silicon nitride powder, and 4 parts of activated alumina. The preparation step...

Embodiment 2

[0032] A recycled concrete containing PC waste is characterized in that it includes the following percentage components: 20wt% of cement, 40wt% of river sand, 10wt% of PC waste, 15wt% of recycled fine aggregate, polycarboxylate-based high-performance water reducing 0.3 wt % of the agent, 2 wt % of modified fluorite powder, and water balance; it also includes 0.05 wt % of barium sulfate, 0.2 wt % of nano calcium sulfate whiskers, and 1.5 wt % of isooctyltriethoxysilane.

[0033] Cement should be any one of P.P, P.F and P.C. River sand should be medium sand with a moisture content of 6-7%. The particle size of PC waste should be less than 1mm. The particle size of recycled fine aggregate should be 1-3mm and water absorption should be less than 5%. .

[0034]The modified fluorite powder is composed of the following parts by mass: 20 parts of fluorite, 30 parts of petroleum asphalt, 5 parts of nano-scale silicon nitride powder, and 4 parts of activated alumina. The preparation ste...

Embodiment 3

[0041] A recycled concrete containing PC waste is characterized in that it includes the following percentage components: 25wt% of cement, 20wt% of river sand, 8wt% of PC waste, 30wt% of recycled fine aggregate, polycarboxylate-based high-performance water reducing 0.2 wt % of agent, 1.5 wt % of modified fluorite powder, and water balance; it also includes 0.2 wt % of barium sulfate, 0.4 wt % of nano calcium sulfate whiskers, and 1 wt % of isooctyltriethoxysilane.

[0042] Cement should be any one of P.P, P.F and P.C. River sand should be medium sand with a moisture content of 6-7%. The particle size of PC waste should be less than 1mm. The particle size of recycled fine aggregate should be 1-3mm and water absorption should be less than 5%. .

[0043] The modified fluorite powder is composed of the following parts by mass: 35 parts of fluorite, 40 parts of petroleum asphalt, 6 parts of nano-scale silicon nitride powder, and 5 parts of activated alumina. The preparation steps of...

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Abstract

The invention provides recycled concrete containing PC waste and a production technology thereof. The recycled concrete is prepared from the following components, in percentage by weight: 15-25% of cement, 20-40% of bank sand, 2-10% of PC waste, 15-30% of regenerated fine aggregate, 0.1-0.5% of polycarboxylate-type high-performance water reducing agent, 1-2.5% of modified fluorite powder, and thebalance of water. Through reasonable raw material selecting and blending, the effect of the recycled concrete is effectively guaranteed, the blending and coupling performance among the materials is high, slump retaining type peaceability is outstandingly improved, the mechanical property is remarkably enhanced, the water reducing rate can reach 30% or above, the 28d compressive strength can maintain 45.7MPa or above.

Description

technical field [0001] The invention relates to the technical field of recycled concrete, in particular to a recycled concrete containing PC waste and a production process thereof. Background technique [0002] 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. According to the combination of aggregates, recycled concrete can be in the following situations: the aggregates are all recycled aggregates; the coarse aggregates are recycled aggregates, and the fine aggregates are natural sand; The material is recycled aggregate; recycled aggregate replaces part of coarse aggregate or fine aggregate. [0003] The development and utilization of waste concrete as recycled aggregate, on the one hand, solves the problem of the difficulty of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/04
CPCC04B28/04C04B2201/50C04B7/26C04B7/12C04B14/06C04B18/04C04B22/126C04B22/142C04B22/143C04B24/42C04B24/36C04B14/328C04B14/303C04B24/28C04B2103/302
Inventor 戴大力
Owner SUZHOU JIASHENG YUANDA CONSTR IND CO LTD
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