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Steam curing preparation method of pervious concrete

A permeable concrete and steam-cured technology, which is applied in the field of concrete processing, can solve the problems affecting the quality and durability of concrete, the coarsening of the pore size, and the decline in strength, etc., to overcome the poor resistance to chloride ion penetration, easy to obtain raw materials, and simple preparation methods Effect

Inactive Publication Date: 2021-03-19
浙江波威新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Conventional steam-cured cement concrete has congenital micro-cracks, and a large number of ettringite crystals are enriched in these micro-cracks. After steaming and curing in a dry environment, it is easier to form ettringite; higher curing temperature leads to The increase of concrete porosity, coarsening of pore size, and expansion of ettringite are the main reasons for the decrease of compactness and strength of the internal structure of concrete, which also lead to a serious decline in its resistance to external ion erosion
[0004] And the use of unreasonable maintenance system will affect the quality and durability of concrete

Method used

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  • Steam curing preparation method of pervious concrete

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] First weigh the raw material of permeable concrete: 1250kg / m 3 Aggregate amount, 360kg / m 3 Cement volume, 65kg / m 3 Water volume, 6.5kg / m 3 Water reducer, 35kg / m 3 Diatomaceous earth, 12kg / m 3 Fly ash, 6kg / m 3 Wet ground carbide slag; the mass percentage of the cement component is: SiO 2 : 15.5%, Al 2 o 3 : 2.8%, Fe 2 o 3 : 4.55%, CaO: 72%, MgO: 1.8%, SO 3 : 4.8%, the balance is unavoidable impurities; the composition content of the water reducer includes 16% polycarboxylate, 26% acrylic polycarboxylate water reducer, 36% slump-retaining polycarboxylate water reducer and 18% % Slow-release polycarboxylate superplasticizer, the balance is water.

[0019] Stir the permeable concrete raw material at 55°C and 530r / min for 7h, then cast it into shape, let it stand for 4.5h, then seal it with steam at 92°C for 2.5h, then dry heat at 145°C for 6h, and carry out the second Secondary steam curing for 5 hours, sealed curing for 5 hours, and finally 15°C / h cooling treat...

Embodiment 2

[0021] First weigh the raw material of permeable concrete: 1200kg / m 3 Aggregate amount, 350kg / m 3 Cement volume, 60kg / m 3 Water volume, 6.0kg / m 3 Water reducer, 30kg / m 3 Diatomaceous earth, 10kg / m 3 Fly ash, 5kg / m 3 Wet ground carbide slag; the mass percentage of the cement component is: SiO 2 : 15%, Al 2 o 3 : 2.6%, Fe 2 o 3 : 4.55%, CaO: 72%, MgO: 1.8%, SO 3 : 4.8%, the balance is unavoidable impurities; the composition content of the water reducer includes 16% polycarboxylate, 26% acrylic polycarboxylate water reducer, 36% slump-retaining polycarboxylate water reducer and 18% % Slow-release polycarboxylate superplasticizer, the balance is water.

[0022] Stir the permeable concrete raw material at 50°C and 500r / min for 7h, then pour it into shape, let it stand for 4h, then seal it with steam at 90°C for 2h, then dry heat at 140°C for 5h, and perform the second steaming Curing for 4 hours, sealing and curing for 4 hours, and finally 14°C / h cooling treatment to ob...

Embodiment 3

[0024] First weigh the raw material of permeable concrete: 1300kg / m 3 Aggregate amount, 380kg / m 3 Cement volume, 70kg / m 3 Water volume, 7.5kg / m 3 Water reducer, 40kg / m 3 Diatomaceous earth, 14kg / m 3 Fly ash, 7kg / m 3 Wet ground carbide slag; the mass percentage of the cement component is: SiO 2 : 15%, Al 2 o 3 : 2.6%, Fe 2 o 3 : 4.55%, CaO: 72%, MgO: 1.8%, SO 3 : 4.8%, and the balance is unavoidable impurities; the composition content of the water reducer includes 20% polycarboxylate, 30% acrylic polycarboxylate water reducer, 37% slump-retaining polycarboxylate water reducer and 20% % slow-release polycarboxylate superplasticizer, the balance is water.

[0025] Stir the permeable concrete raw material at 60°C and 550r / min for 8h, then cast it into shape, let it stand for 5h, then seal it with steam at 95°C for 3h, then dry heat at 150°C for 6h, and perform the second steaming Curing for 6 hours, sealing and curing for 6 hours, and finally 15°C / h cooling treatment t...

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Abstract

The invention belongs to the field of concrete processing, and relates to a steam curing preparation method of pervious concrete. According to the steam curing preparation method of pervious concrete,the defects that traditional cement is low in strength and poor in chloride ion penetration resistance are overcome by optimizing the content of components of the pervious concrete, reasonably setting the temperature in the steam curing process and utilizing two times of steam curing, the preparation method is simple, raw materials are easily available, and the method is suitable for large-scaleindustrial production.

Description

[0001] field of invention [0002] The invention relates to a steam curing preparation method of permeable concrete, which belongs to the field of concrete processing. Background technique [0003] Conventional steam-cured cement concrete has congenital micro-cracks, and a large number of ettringite crystals are enriched in these micro-cracks. After steaming and curing in a dry environment, it is easier to form ettringite; higher curing temperature leads to The increase of concrete porosity, coarsening of pore size, and expansion of ettringite are the main reasons for the decrease of the compactness and strength of the internal structure of concrete, which also lead to a serious decline in its resistance to external ion erosion. [0004] Moreover, the use of unreasonable maintenance systems will affect the quality and durability of concrete. Adopting a reasonable maintenance system to create an optimal condition for cement hydration and hardening, while minimizing the amount ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/02C04B38/00C04B40/02C04B111/20C04B111/40
CPCC04B28/02C04B2111/00284C04B2111/40C04B2111/20C04B2201/50C04B14/08C04B18/08C04B18/04C04B38/00C04B40/024C04B40/0263C04B2103/302C04B2103/0068
Inventor 盛雷军王有路黄国阳刘铨魏玲玲
Owner 浙江波威新材料科技有限公司