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Coal gasification slag all-component pervious concrete

A technology for permeable concrete and coal gasification slag, applied in the field of materials, can solve the problems of inability to match mechanics and water permeability, poor wear resistance, small thickness of slurry, etc., and achieve good wear resistance and water purification performance, wear resistance The effect of good sex and easy operation

Inactive Publication Date: 2020-12-25
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a kind of environment-friendly green ecological concrete, pervious concrete is very critical to realize the concept of "sponge city". However, traditional pervious concrete has the problem that the mechanical and water permeability properties cannot be matched well, and because the cementitious material slurry of pervious concrete The body thickness is small, and its wear resistance is relatively poor

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The coal gasification slag full-component permeable concrete of this embodiment is mainly made of the following raw materials in weight percentage: 12.4% of finely ground coal gasification slag, 6.1% of sodium silicate, 2.4% of sodium hydroxide, 2.1% of water, 1.18- 2.36mm coal gasification slag 9.2%, 2.36-4.75mm coal gasification slag 67.8%.

[0026] The coal gasification slag mentioned above is the residue discharged during the coal gasification process. The detection of coal gasification slag includes the following components by weight percentage: 43.65% of silicon dioxide, 21.31% of aluminum oxide, 10.64% of calcium oxide, 4.63% of ferric oxide, 1.42% of potassium oxide, 0.93% of magnesium oxide, 0.87% of titanium dioxide, Sodium oxide 0.78%, residual carbon 10.09%.

[0027] The method for preparing the coal gasification slag full-component permeable concrete sample of this embodiment includes the following steps:

[0028] 1) Grinding the coal gasification slag un...

Embodiment 2

[0037] This example is the same as Example 1, except that the curing condition is 5 days at 20°C.

[0038] The size of the coal gasification slag full-component permeable concrete sample in this embodiment is 100mm×100mm×100mm, the compressive strength is 22.6MPa, and the water permeability coefficient is 5.2×10 -2 cm / s, lead ion removal rate is 96.2%.

Embodiment 3

[0040] This example is the same as Example 1, except that the alkali activator is a mixed solution of sodium silicate and potassium hydroxide, and the curing condition is 7 days at 30°C.

[0041] The size of the coal gasification slag full-component permeable concrete sample in this embodiment is 100mm×100mm×100mm, the compressive strength is 29.2MPa, and the water permeability coefficient is 3.6×10 -2 cm / s, lead ion removal rate is 95.8%.

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Abstract

The invention discloses coal gasification slag all-component pervious concrete. Ground coal gasification slag is taken as a silicon-aluminum raw material to prepare a coal gasification slag geopolymerwith good mechanical properties as a cementing material; and screened coal gasification slag is used as aggregate to prepare the pervious concrete which have adaptive mechanical properties and waterpermeability and has good wear resistance and water purification performance. The aggregate and the silicon-aluminum raw material used in the invention are both the coal gasification slag, so that theindustrial solid waste coal gasification slag is fully utilized, and the purpose of resource utilization is achieved. Meanwhile, the coal gasification slag contains a certain amount of activated carbon, so that the adsorption performance of the pervious concrete can be improved, and the pervious concrete which has adaptive mechanical properties and water permeability and has good wear resistanceand water purification performance is obtained.

Description

technical field [0001] The invention belongs to the technical field of materials, and in particular relates to a permeable concrete with full components of coal gasification slag. Background technique [0002] Coal gasification slag is the solid waste produced in the process of coal gasification. Since coal is the most important energy source in our country and the coal gasification process is one of the important technologies in the coal industry, a large amount of coal gasification slag is discharged every year in our country, and the large amount of coal gasification slag is seriously harmful to the environment. Therefore, the coal gasification slag The utilization of resources is an urgent problem to be solved. [0003] At present, the country has put forward the requirement of building a "sponge city", through the application of a large number of permeable materials, to realize the natural accumulation, natural infiltration and natural purification of rainwater in the ...

Claims

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Application Information

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IPC IPC(8): C04B28/00C04B18/06
CPCC04B18/065C04B28/006C04B2111/00284C04B2111/00991C04B2201/50C04B22/062C04B12/04Y02W30/91Y02P40/10
Inventor 陈潇卢亚磊詹廷廷马佳杰张赐生
Owner WUHAN UNIV OF TECH
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