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Organic low-alkali setting accelerator capable of forming interpenetrating network structure as well as preparation method thereof

An interpenetrating network structure and quick-setting agent technology, applied in the field of building materials, can solve the problems of large proportion of fine aggregate, damage to the durability of concrete, and cracks, etc., to increase the flexural strength, improve the flexural strength, and improve the bonding Effect

Inactive Publication Date: 2018-10-09
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The proportion of fine aggregate in shotcrete is large, which leads to a high probability of alkali-aggregate reaction, and there is a risk of cracks after curing, which damages the durability of concrete. The use of it will not cause alkali polymerization or use low-alkali type It is difficult for the aggregate of cement to completely avoid this problem

Method used

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  • Organic low-alkali setting accelerator capable of forming interpenetrating network structure as well as preparation method thereof
  • Organic low-alkali setting accelerator capable of forming interpenetrating network structure as well as preparation method thereof
  • Organic low-alkali setting accelerator capable of forming interpenetrating network structure as well as preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0022] The preparation and maintenance of the concrete samples are designed according to the "Shotcrete Mix Design Method", and the compression samples are made according to GBJ82-85.

[0023] The mortar strength test is carried out according to the test method JC477-2005. Determine the flexural strength of mortar test blocks at different ages.

Embodiment 1

[0024] Implementation Example 1: Weigh 400g of cement, 160ml of water (W / C=0.4), divide the water into three parts of 100ml, 40ml, and 20ml and place them in three beakers, weigh 14g of acrylamide, N,N-methylene 0.4g of bisacrylamide, 1.4g of ammonium persulfate, 1g of N,N,N',N'-tetramethylethylenediamine; dissolve acrylamide and N,N-methylenebisacrylamide in 100ml of water In a beaker, dissolve ammonium persulfate in a beaker with 40ml of water, and dissolve N,N,N',N'-tetramethylethylenediamine in a beaker with 20ml of water. Pour the cement into the mixing pot of the slurry mixer, add acrylamide and N,N-methylenebisacrylamide solution, ammonium persulfate solution, N,N,N',N'-tetramethylethylenedi For the amine solution, stir and mix for 30 seconds, remove the stirring pot, and conduct subsequent coagulation time, flexural strength, and compressive strength tests. The national standard for mortar strength test requires a water-cement ratio of 0.5, which is achieved by changi...

Embodiment 2

[0025] Implementation Example 2: Weigh 400g of cement, 160ml of water (W / C=0.4), divide the water into three parts of 100ml, 40ml, and 20ml and place them in three beakers, weigh 6g of methacrylamide, N-methylol Acrylic acid 0.5g, potassium persulfate 1.6g, sodium bisulfite 1.2g; methacrylamide and N-methylol acrylic acid are dissolved in a beaker with 100ml of water, potassium persulfate is dissolved in a beaker with 40ml of water, Sodium bisulfite was dissolved in a beaker with 20ml of water. Pour the cement into the stirring pot of the slurry mixer, add methacrylamide and N-methylolacrylic acid solution, potassium persulfate solution, and sodium bisulfite solution in sequence, stir and mix for 30 seconds, remove the stirring pot, and carry out Follow-up setting time, flexural strength, compressive strength test. The national standard for mortar strength test requires a water-cement ratio of 0.5, which is achieved by changing the cement content to 320g.

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Abstract

The invention relates to an organic low-alkali setting accelerator capable of forming an interpenetrating network structure. A hydration product formed through cement hydration as well as a macromolecular polymer form the interpenetrating network structure, so that the quick setting effect is achieved. The setting accelerator comprises the following components in parts by weight: 5 to 13 parts ofa polymer monomer, 0.3 to 0.8 part of a crosslinking agent, 1 to 1.7 parts of an initiator, 0.5 to 1.5 parts of a catalyst and 80 to 85 parts of water. The setting accelerator has the advantages of adjustable setting time, high tolerance on environment change and raw material change, high adaptability on different types of cement and the like; regardless of the aqueous solution doping mode or thepowder doping and stirring and water adding stirring mode, the quick setting characteristic of quickly forming the interpenetrating network structure can be performed. The organic-inorganic interpenetrating network structure obviously improves the toughness of a cement-based material and mainly manifests in that the crack resistance is improved and the breaking strength is improved. The initial setting time and the final setting time of the cement with the setting accelerator as well as the 28-day compressive strength meets the requirement of the national standard, and high adaptability on a water reducer is achieved.

Description

technical field [0001] The invention relates to a liquid low-alkali quick-setting agent for shotcrete, which belongs to the field of building materials. Background technique [0002] Shotcrete has been widely used in tunnel engineering, underground engineering, hydraulic tunnel, slope protection, water conservancy and hydropower, mine tunnel and engineering repair and other fields. Accelerator is an essential admixture in shotcrete. Its main function is to speed up the setting and hardening speed of shotcrete, reduce the rebound loss, prevent the shotcrete from falling off due to gravity, increase the thickness of one shot and shorten the distance between sprayed layers. Intervals. [0003] The development of accelerators has gone through the development process of powdery high alkalinity, powdery low alkalinity, liquid high alkalinity, liquid low alkalinity, liquid alkali-free, and organic-inorganic composite accelerators. Liquid alkali-free accelerators are accelerators ...

Claims

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Application Information

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IPC IPC(8): C08F220/56C08F222/38C08F220/54C08F220/06C04B24/26C04B103/12
CPCC04B24/2641C04B24/2652C04B2103/12C08F220/06C08F220/56C08F222/385
Inventor 王子明张琳王亚丽崔素萍刘晓毛倩瑾
Owner BEIJING UNIV OF TECH
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