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Alkali-free accelerator with shrinkage function and preparation method thereof

An accelerator and functional technology, applied in the field of liquid alkali-free accelerator and its preparation, can solve the problems of low crack resistance and excessive shrinkage of shotcrete, and achieve improved crack resistance, rapid hardening and shrinkage reduction, The effect of reducing the rebound rate

Inactive Publication Date: 2018-04-03
JIANGSU SOBUTE NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] Aiming at the problems that existing accelerators cannot solve the problems of excessive shrinkage and low crack resistance of shotcrete, the present invention provides an alkali-free accelerator with shrinkage reduction function and its preparation method

Method used

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  • Alkali-free accelerator with shrinkage function and preparation method thereof
  • Alkali-free accelerator with shrinkage function and preparation method thereof
  • Alkali-free accelerator with shrinkage function and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0043] The preparation of the liquid alkali-free quick-setting agent with shrinkage and anti-cracking function comprises the following steps:

[0044] (1) Mix 40g of aluminum sulfate, 2g of diethanolamine, 2g of aluminum fluoride, 5g of magnesium sulfate, 1g of phosphoric acid and 42g of water, heat up to 80-90°C, stir, and react for 2-4 hours;

[0045] (2) After the reactant in step (1) is completely dissolved, cool down to below 60°C, add 3g of shrinkage reducing component and 1g of sulfonated graphene, and stir for 1-2h;

[0046] (3) After completely dissolving the reactant in step (2), heat up to 90-95°C, add 2g of magnesium silicate, and stir for 1h;

[0047] (4) Rapidly cool the product of step (3) to below 50°C within 0.5h, add 2g of polyvinyl alcohol, stir for 1-2h, and completely dissolve to obtain the liquid alkali-free accelerator with shrinkage-reducing and anti-cracking functions .

Embodiment 2

[0049] The preparation of the liquid alkali-free quick-setting agent with shrinkage and anti-cracking function comprises the following steps:

[0050] (1) Mix 43g of aluminum sulfate, 3g of diethanolamine, 2g of sodium fluoride, 5g of magnesium sulfate, 1g of phosphoric acid and 42g of water, heat up to 80-90°C, stir, and react for 2-4 hours;

[0051] (2) After the reactant in step (1) is completely dissolved, cool down to below 60°C, add 2g shrinkage reducing component and 2g sulfonated graphene, and stir for 1-2h;

[0052] (3) After completely dissolving the reactant in step (2), heat up to 90-95°C, add 2g of magnesium silicate, and stir for 1h;

[0053] (4) Rapidly cool the product of step (3) to below 50°C within 0.5h, add 2g of polyvinyl alcohol, stir for 1-2h, and completely dissolve to obtain the liquid alkali-free accelerator with shrinkage-reducing and anti-cracking functions .

Embodiment 3

[0055] The preparation of the liquid alkali-free quick-setting agent with shrinkage and anti-cracking function comprises the following steps:

[0056] (1) Mix 45g of aluminum sulfate, 2g of triethanolamine, 2g of sodium fluoride, 5g of magnesium sulfate, 1g of oxalic acid and 38g of water, heat up to 80-90°C, stir, and react for 2-4 hours;

[0057] (2) After the reactant in step (1) is completely dissolved, cool down to below 60°C, add 2g of shrinkage reducing component and 1g of sulfonated graphene, and stir for 1-2h;

[0058] (3) After completely dissolving the reactant in step (2), heat up to 90-95°C, add 3g of magnesium silicate, and stir for 1h;

[0059] (4) Rapidly cool the product of step (3) to below 50°C within 0.5h, add 1g of cellulose ether, stir for 1-2h, and completely dissolve to obtain the liquid alkali-free accelerator with shrinkage-reducing and anti-cracking functions .

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Abstract

The invention provides an alkali-free accelerator with a shrinkage function as well as a preparation method and application thereof. The alkali-free accelerator with the shrinkage function takes alcohol amine, aluminum sulfate, magnesium sulfate and / or magnesium silicate as an accelerating component and is composed of a shrinkage component and sulfonated graphene; and the shrinkage component has apolyether chain segment and a straight chain alkyl group containing C16 to C18 or an alkyl group with a branch chain. The alkali-free accelerator with the shrinkage function solves the problems of over-shrinkage and relatively low cracking resistance of sprayed concrete.

Description

technical field [0001] The invention belongs to the technical field of concrete admixtures, in particular to a liquid alkali-free quick-setting agent with shrinkage-reducing and anti-cracking functions and a preparation method thereof. Background technique [0002] Accelerator is an admixture used in shotcrete to make concrete set and harden rapidly. Accelerator has become one of the most critical materials in shotcrete engineering due to its remarkable characteristics in quick setting and early strength. It is widely used in tunnel support, mine excavation, underground powerhouses of water conservancy projects, slope fixation and repair and reinforcement projects. . In recent years, my country's hydropower, high-speed railway, highway and other infrastructure projects have been carried out on a large scale. Especially in the western mountainous areas, the amount of tunnel construction is very large, the amount of sprayed concrete has increased steadily, and the demand for ...

Claims

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Application Information

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IPC IPC(8): C04B24/32C04B24/38C04B24/16C04B103/12
CPCC04B24/16C04B24/32C04B40/0039C04B2103/12C04B22/148C04B24/122C04B22/126C04B22/142C04B22/165C04B22/002C04B22/08C04B24/2623C04B24/04C04B24/383
Inventor 王伟张小磊王瑞高楠箫杨晓奇
Owner JIANGSU SOBUTE NEW MATERIALS
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