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Low-pH ultrafine aluminophosphates cement-based grouting material

A technology of ultrafine aluminophosphate and grouting materials, which is applied in the field of cement-based grouting materials, which can solve the problems of pollution of the surrounding environment and groundwater, difficulty in injecting grout, and low strength of stone bodies, so as to increase the effective void ratio and permeability High durability, high early strength, and excellent seismic performance

Inactive Publication Date: 2016-12-21
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Chemical sealing materials are not suitable for high-level radioactive waste deep geological disposal projects due to their shortcomings such as containing organic substances, low concretion strength, poor durability, and pollution to the surrounding environment and groundwater.
Ordinary cement-based fissure sealing materials have large solid particles, and it is difficult to inject grout into small cracks or fissures (about 100 μm) in rock mass. Therefore, a new type of sealing material needs to be developed to meet the needs of rock fissure sealing in deep geological disposal.

Method used

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  • Low-pH ultrafine aluminophosphates cement-based grouting material
  • Low-pH ultrafine aluminophosphates cement-based grouting material

Examples

Experimental program
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Effect test

Embodiment 1

[0019] A low-pH superfine aluminophosphate cement-based grouting material, which is obtained by mixing and stirring raw materials with water at a water-to-material ratio of 1.2:1. The composition of the raw materials is as follows in terms of weight percentage: 45% aluminophosphate cement, pulverized coal Ash 35%, slag 13.5%, bentonite 5%, polycarboxylate superplasticizer (manufactured by Wuhan Huaxuan High-tech Co., Ltd.) 0.5%, magnesium oxide 1%.

[0020] The grouting material obtained in this example has a bleeding rate of 1.0% under normal pressure for 2 hours, good stability, a viscosity of 21.22mPas, good fluidity, an initial setting time of 5h35min, and a final setting time of 7h20min, indicating that it has high groutability and is free of stones. The compressive strength of body 7d is 9.8MPa, the compressive strength of 28d is 16.8MPa, the longitudinal expansion rate of 1d is 0.08%, and the pH value of 3d slurry is 10.3, which shows that the grouting material meets the...

Embodiment 2

[0022] A low-pH superfine aluminophosphate cement-based grouting material, which is obtained by mixing and stirring raw materials with water. The raw materials are composed as follows by weight percentage: 50% aluminophosphate cement, 35% fly ash, and 8.2% slag , bentonite 5%, polycarboxylate superplasticizer 0.8%, magnesium oxide 1%.

[0023] The normal pressure 2h bleeding rate of the grout obtained in this example is 1.4%, the viscosity is 26.84mPas, the initial setting time is 5h15min, the final setting time is 6h55min, the compressive strength of the stone body is 13.3MPa at 7d, and the compressive strength at 28d is 17.8MPa , 1d longitudinal expansion rate of 0.08%, 3d slurry pH value = 10.3.

Embodiment 3

[0025] A low-pH superfine aluminophosphate cement-based grouting material, which is obtained by mixing and stirring raw materials with water. The composition of the raw materials is as follows in terms of weight percentage: 55% aluminophosphate cement, 25% fly ash, and 13% slag , bentonite 5%, polycarboxylate superplasticizer 1.0%, magnesium oxide 1%.

[0026] The grouting material obtained in this example has a normal pressure 2h bleeding rate of 1.3%, a viscosity of 26.5mPas, an initial setting time of 6h50min, a final setting time of 8h35min, and a stone body with a compressive strength of 14.6MPa at 7d and a compressive strength of 16.9MPa at 28d. , 1d longitudinal expansion rate of 0.08%, 3d slurry pH value = 10.3.

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Abstract

The invention relates to a low-pH ultrafine aluminophosphates cement-based grouting material, which is obtained by mixing and stirring raw materials and water. Raw materials of the product contain, by weight, 45-55% of aluminophosphates cement, 25-35% of fly ash, 5-15% of slag, 5% of a dispersant, 0.5-1.0% of a polycarboxylic acid type water-reducer, and 1% of an expanding agent. The pH value of the grouting material is less than or equal to 11. The grouting material of the invention has good fluidity and slight expansibility, has a good sealing effect when used for deep geological disposal of high-level waste, has good stability when in use, and has high fluidity, high groutability and high endurance. After slurry is hardened, anti-seismic property is excellent.

Description

technical field [0001] The invention relates to a cement-based grouting material, in particular to an environment-friendly grouting material which can be used for closing rock fissures in deep geological disposal of high-level radioactive waste, and can also be used as an environment-friendly grouting material for engineering emergency rescue, engineering repair, and building reinforcement and transformation. Background technique [0002] High-level radioactive waste contains nuclides with strong radioactivity, high toxicity, high calorific value, and long half-life. How to safely dispose of high-level radioactive waste has become a difficulty and bottleneck in current radioactive waste management. major issues of development. The deep geological disposal method based on the "multiple barrier principle" is the most promising ultimate disposal method for high-level radioactive waste. This is based on the containment and blockage of nuclides, with multiple barriers (including...

Claims

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Application Information

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IPC IPC(8): C04B28/34C04B111/70C04B111/72
CPCC04B28/34C04B2111/70C04B2111/72C04B2201/50
Inventor 李相国杨蓉刘卓霖明添王冠东徐朋辉胡赞
Owner WUHAN UNIV OF TECH
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