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Method for preparing green pervious concrete by using tailings

A permeable concrete and green technology, applied in the field of civil and construction materials, can solve the problems that affect the use and promotion of permeable concrete, cannot meet the requirements of high-performance pavement, and cannot meet the requirements of drainage, etc., to achieve significant superposition effect, crack resistance reduction, The effect of high early strength effect

Inactive Publication Date: 2018-08-17
GUANGXI POLYTECHNIC VOCATIONAL & TECHN COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing permeable concrete has poor workability, uneven pore distribution, low strength, low freeze-thaw resistance, easy freeze-thaw damage, low water permeability coefficient, and cannot meet the requirements of laying high-performance pavements due to the reasons of materials and preparation processes. , and cannot meet the drainage requirements in the rainy season, which affects the use and promotion of permeable concrete products

Method used

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  • Method for preparing green pervious concrete by using tailings

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Raw materials (by weight):

[0030] 50 parts of aggregate, 20 parts of 52.5 Portland cement, 15 parts of ceramsite, 1 part of superplasticizer, 0.1 part of composite early strength agent, 0.1 part of composite retarder, 0.02 part of defoamer, and 0.02 part of air-entraining agent ;

[0031] The preparation method of green permeable concrete comprises the following steps:

[0032]S1. First add aggregate, 52.5 Portland cement, ceramsite, high-efficiency water reducer, defoamer and appropriate amount of water into the mixer and stir for 2-3 minutes, then add composite early strength agent, composite retarder and air-entraining Continue to stir the agent for 3-5 minutes, adjust the consistency of the mixture with an appropriate amount of water, put the stirred concrete into the mold for static pressure molding, demould after 24 hours, and obtain a permeable concrete body, the pressure is 1-2MPa, Static pressure time 15-20s;

[0033] S2. During curing, first spray the cur...

Embodiment 2

[0035] Raw materials (by weight):

[0036] 60 parts of aggregate, 25 parts of 52.5 Portland cement, 16 parts of ceramsite, 1.5 parts of superplasticizer, 0.2 part of composite early strength agent, 0.4 part of composite retarder, 0.05 part of defoamer, and 0.05 part of air-entraining agent ;

[0037] The preparation method of green permeable concrete comprises the following steps:

[0038] S1. First add aggregate, 52.5 Portland cement, ceramsite, high-efficiency water reducer, defoamer and appropriate amount of water into the mixer and stir for 2-3 minutes, then add composite early strength agent, composite retarder and air-entraining Continue to stir the agent for 3-5 minutes, adjust the consistency of the mixture with an appropriate amount of water, put the stirred concrete into the mold for static pressure molding, demould after 24 hours, and obtain a permeable concrete body, the pressure is 1-2MPa, Static pressure time 15-20s;

[0039] S2. During curing, first spray the...

Embodiment 3

[0041] Raw materials (by weight):

[0042] 65 parts of aggregate, 28 parts of 52.5 Portland cement, 18 parts of ceramsite, 1.8 parts of superplasticizer, 0.4 part of composite early strength agent, 0.8 part of composite retarder, 0.08 part of defoamer, and 0.08 part of air-entraining agent ;

[0043] The preparation method of green permeable concrete comprises the following steps:

[0044] S1. First add aggregate, 52.5 Portland cement, ceramsite, high-efficiency water reducer, defoamer and appropriate amount of water into the mixer and stir for 2-3 minutes, then add composite early strength agent, composite retarder and air-entraining Continue to stir the agent for 3-5 minutes, adjust the consistency of the mixture with an appropriate amount of water, put the stirred concrete into the mold for static pressure molding, demould after 24 hours, and obtain a permeable concrete body, the pressure is 1-2MPa, Static pressure time 15-20s;

[0045] S2. During curing, first spray the...

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Abstract

The invention relates to a method for preparing green pervious concrete by using tailings, characterized in that the green pervious concrete is prepared from the following raw materials in parts by weight: 50 to 70 parts of aggregate, 20 to 30 parts of 52.5 Portland cement, 15 to 20 parts of ceramsite, 1 to 2 parts of efficient water reducing agent, 0.1 to 0.5 part of composite early strength agent, 0.1 to 1 part of composite retarder, 0.02 to 0. 1 part of defoaming agent, and 0.02 to 0.1 part of air entraining agent; the aggregate comprises tailings and machine-made sand, the tailings have aparticle size of 5 to 10 mm, the machine-made sand has a particle size of 1 to 5 mm, and the weight ratio of the tailings to the machine-made sand is (3 to 5) to 2. According to the green pervious concrete provided by the invention, the tailings and the ceramsite are adopted as the aggregate, and the gradation of the aggregate and the composition and the quality of an admixture are adjusted, so that the strength, the durability, the water permeability and the freeze-thaw resistance of the pervious concrete are greatly improved.

Description

technical field [0001] The invention belongs to the technical field of civil engineering materials, in particular to a method for preparing green permeable concrete by using tailings. Background technique [0002] The surface of the modern city has been covered by reinforced concrete buildings and impermeable roads. Compared with natural soil pavement, ordinary concrete pavement lacks breathability, heat absorption and water permeability, which brings a series of environmental problems. At present, ordinary concrete has extremely poor water permeability, which puts great pressure on the drainage system of the road surface. The rainwater that cannot penetrate the ground can only be discharged into the river through the drainage system, which brings a great burden to urban rivers. [0003] The development of mineral resources plays an important role in the country's economic construction, but it also brings serious negative effects to the environment. For example, a large amo...

Claims

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Application Information

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IPC IPC(8): C04B28/04C04B18/12
CPCC04B18/12C04B28/04C04B2111/00017C04B2201/50C04B14/06C04B18/023C04B2103/302C04B2103/12C04B2103/22C04B2103/50C04B2103/304Y02W30/91
Inventor 赵雅欣黄晓玲韦鸣何泳欢陈玲玲
Owner GUANGXI POLYTECHNIC VOCATIONAL & TECHN COLLEGE
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