Self-compacting concrete prepared from recycled aggregate and preparation method thereof

A technology of self-compacting concrete and recycled aggregate, applied in the field of building materials, can solve the problems of increased water-cement ratio in the transition zone of the interface of new cement mortar, decreased mechanical properties of concrete materials, poor compaction performance of recycled aggregate, etc. Dispersion effect, improving mechanical strength, improving the effect of dense structure

Active Publication Date: 2021-03-16
靖江市恒生混凝土制造有限公司
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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 in the scheme of directly using recycled aggregates to prepare self-compacting concrete, due to the poor compactness of recycled aggregates, it contains a large number of gaps, resulting in high water absorption, and the absorbed water Participating in the hydration reaction during the concrete mixing process increases the water-cement ratio in the transition zone of the recycled aggregate-new cement mortar interface, making the structure of the interface zone loose and forming more pores, which will lead to a significant decrease in the mechanical properties of the concrete material.

Method used

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  • Self-compacting concrete prepared from recycled aggregate and preparation method thereof
  • Self-compacting concrete prepared from recycled aggregate and preparation method thereof
  • Self-compacting concrete prepared from recycled aggregate and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] In parts by weight, weigh 45 parts of acetone, 10 parts of nano-silicon carbide and 3 parts of silane coupling agent KH-560 and place them in a stirring device, stir and mix and adjust the pH to 4.5 with triethylamine, collect the mixed solution and Place it under 200W for ultrasonic dispersion for 10min, collect the dispersed suspension and dry it at 200°C for 3h, let it cool down to room temperature and grind it to obtain modified nano-silicon carbide particles;

[0032] According to the mass ratio of 1:3:15, add the modified nano-silicon carbide particles and fly ash to the water glass with a solid content of 28%, stir and mix, place it under 200W for ultrasonic dispersion for 10min, and collect the coating modification solution; Take the recycled aggregate and add the recycled aggregate to the coating modification solution according to the mass ratio of 1:5, pressurize to 3MPa, soak under pressure for 25min, then ultrasonically vibrate at 200W for 25min, take out and...

Embodiment 2

[0034] In terms of parts by weight, weigh 47 parts of acetone, 12 parts of nano-silicon carbide and 4 parts of silane-coupled KH-560 and place them in a stirring device, stir and mix and adjust the pH to 4.7 with triethylamine, collect the mixed solution and place Ultrasonic disperse at 250W for 12min, collect the dispersed suspension and dry it at 210°C for 4h, let it cool down to room temperature and grind it to obtain modified nano-silicon carbide particles;

[0035] According to the mass ratio of 1:3:15, add the modified nano-silicon carbide particles and fly ash to the water glass with a solid content of 28%, stir and mix, place it under 250W for ultrasonic dispersion for 12min, and collect the coating modification solution; Take the recycled aggregate and add the recycled aggregate to the coating modification solution according to the mass ratio of 1:5, pressurize to 4MPa, soak under pressure for 27min, and then ultrasonically vibrate at 250W for 27min, take out and soak T...

Embodiment 3

[0038] In terms of parts by weight, weigh 50 parts of acetone, 15 parts of nano-silicon carbide and 5 parts of coupling agent and place them in a stirring device, stir and mix and adjust the pH to 5.0 with triethylamine, collect the mixed solution and place it under 300W Ultrasonic dispersion for 15 minutes, collecting the dispersion suspension and drying at 220°C for 5 hours, standing to cool to room temperature and grinding and pulverizing to obtain modified nano-silicon carbide particles;

[0039] According to the mass ratio of 1:3:15, add the modified nano-silicon carbide particles and fly ash to the water glass with a solid content of 28%, stir and mix, place it under 300W for ultrasonic dispersion for 15min, and collect the coating modification solution; Take the recycled aggregate and add the recycled aggregate to the coating modification solution according to the mass ratio of 1:5, pressurize to 5MPa, soak for 30min under pressure, and then ultrasonically vibrate at 300...

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Abstract

The invention relates to the field of dimming films, and particularly discloses self-compacting concrete prepared from recycled aggregate, and the self-compacting concrete prepared from the recycled aggregate comprises 40-50 parts of heat-resistant coarse aggregate, 10-15 parts of modified recycled aggregate, 30-40 parts of fine aggregate, 8-10 parts of cement, 6-10 parts of water, 4-8 parts of mineral powder and 2-5 parts of fly ash. According to the invention, the structure of the recycled aggregate in the self-compacting concrete prepared from the recycled aggregate is optimized, the compactness of the material is improved and capillary pores and microscopic cracks in the recycled aggregate are filled by coating the recycled aggregate with slurry, meanwhile, the structure of the slurry-coated recycled aggregate is round and smooth, pores formed between actually filled materials are small, and thus the compact structure of the self-compacting concrete is further improved, and the mechanical strength of the self-compacting concrete prepared from the recycled aggregate is effectively improved.

Description

technical field [0001] The application relates to the field of building materials, more specifically, it relates to a self-compacting concrete prepared with recycled aggregates and a preparation method thereof. Background technique [0002] Regenerative aggregate self-compacting concrete refers to the concrete formed by substituting the natural coarse aggregate in self-compacting concrete with recycled coarse aggregate. At the same time, self-compacting concrete has high fluidity, no segregation, uniformity and stability. Relying on self-weight, no need to vibrate to achieve dense concrete, so self-compacting concrete with recycled aggregate can not only inherit the advantages of compact concrete, but also recycle construction waste and recycled coarse aggregate, so as to protect the environment, The purpose of saving natural resources. [0003] The relevant technology is that the Chinese invention patent with the publication number CN103130473B discloses a C20 self-compact...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/02C04B20/10C04B20/02C04B111/76
CPCC04B28/02C04B20/1085C04B20/023C04B2201/50C04B2111/76C04B18/16C04B18/12C04B18/08C04B14/324
Inventor 蔡连鑫
Owner 靖江市恒生混凝土制造有限公司
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