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Fly ash base grouting material

A grouting material, fly ash technology, applied in the direction of sustainable waste treatment, solid waste management, climate sustainability, etc., can solve the problems of decreased strength, poor fluidity, low stone rate, etc., to improve the flow performance, reduce Cost, good performance

Inactive Publication Date: 2006-09-20
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] A large amount of cement is used as the grouting material in the grouting project, but the cost of cement grouting is high, the stability of the grout is not good, and the rate of stone formation is low
The cost can be reduced by adding fly ash or slag, but the strength is greatly reduced after the addition of fly ash, and the flow performance is not good
At present, there are not many studies on the large-volume fly ash grouting material (amount greater than 70%). A kind of fly ash grouting material is disclosed in Chinese patent 931039992.4, and its main ingredients are fly ash, clay, slaked lime, Glass and water, no portland cement, but its stone body strength is low, its fluidity is poor, and the fly ash it uses is low calcium fly ash

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Components and proportions: fly ash 76%, Portland cement 19.6%, composite admixture 4.4%. Composite additives: 0.5% water reducer, 0.9% sodium carbonate, 1.0% sodium sulfate and 2% bentonite. (both weight ratio)

[0013] Process: After mixing the components, grind them until the sieve residue of 45 μm is less than 10%, then mix them with water at a ratio of 1:0.8, and make the grouting material after fully stirring.

[0014] Effect: The fluidity of the slurry is 20.2s, and it is 21s after being placed for 30 minutes. The water separation rate is 0.1%, and the stone formation rate is 99.5%. The compressive strength of the stone body is 3MPa at 3d and 9MPa at 28d.

Embodiment 2

[0016] Components and proportions: fly ash 77%, Portland cement 19%, composite admixture: 4%. Composite additives: 0.6% water reducing agent, 1% sodium carbonate, 1.4% sodium sulfate and 1% bentonite.

[0017] Technology: with embodiment 1.

[0018] Effect: The fluidity of the slurry is 16s, and it is still 16s after being placed for 30 minutes, the water separation rate is 0.2%, the stone formation rate is 99.5%, the compressive strength of the stone body is 2.7MPa at 3d, and 8.6MPa at 28d.

Embodiment 3

[0020] Components and proportions: fly ash 70%, Portland cement 23%, sulphoaluminate cement 3%, composite admixture: 3%. Composite additives: 0.9% water reducer, 0.5% sodium carbonate, 0.5% sodium sulfate and 1.1% bentonite.

[0021] Process: After mixing the components, grind them until the sieve residue of 45 μm is less than 10%, then mix them with water at a ratio of 1:1, and make the grouting material after fully stirring.

[0022] Effect: The fluidity of the slurry is 19.1s, and it is still 21s after being placed for 30 minutes, the water separation rate is 0.7%, the stone formation rate is 99.0%, the compressive strength of the stone body is 3.0MPa at 3d, and 9.4MPa at 28d.

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Abstract

The invention provides a fly ash base grouting material, which comprises over 70% of coal ash, a small amount of cement and composite additive, wherein the composite additive comprises sodium sulfate, sodium carbonate, water reducing agent and alta-mud. The invention can achieve high performance slurry through charging composite additive.

Description

1. Technical field [0001] The invention relates to a material for underground grouting of buildings, in particular to a fly ash-based grouting material. 2. Background technology [0002] Fly ash is solid waste discharged from coal-fired thermal power plants or thermal power plants. The annual discharge of fly ash due to power generation in my country exceeds 100 million tons, but the utilization rate of fly ash is not high. The national average The utilization rate is only about 40%. In recent years, with stricter environmental protection requirements, the comprehensive utilization of fly ash has become imminent. Since the sulfur content of coal in our country is relatively high, and high-quality low-sulfur coal is mostly used in the metallurgical industry, the content of sulfur dioxide in the flue gas emitted by power plants is relatively high. In order to prevent these sulfur dioxide from being discharged into the atmosphere, power plants have adopted Flue gas desulfuriza...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B18/08C04B22/14C04B22/10C04B28/04
CPCY02W30/91
Inventor 盛广宏翟建平李琴付晓茹黎飞虎
Owner NANJING UNIV