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Accelerator for concrete spraying construction and preparation method thereof

A technology of shotcrete and quick-setting agent, applied in the field of concrete additives, can solve the problems of unfavorable construction quick-setting agent storage, reducing concrete durability, easy precipitation and other problems, achieving excellent quick-setting effect, improving the uniformity of mixture, The effect of reducing pollution

Inactive Publication Date: 2018-02-23
马多浩
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main component of the commonly used alkali-containing accelerator is sodium metaaluminate, which is a supersaturated solution with poor stability. It is easy to precipitate and precipitate in a low temperature environment or after a long storage time, which is not conducive to the construction in a low temperature environment and the storage of the accelerator.
[0004] In addition, the alkaline substances in the alkali-containing accelerator will chemically react with certain active minerals (activated silica, activated alumina, etc.) in the concrete aggregate to generate swelling substances (or water-swelling substances) that cause internal The phenomenon of cracking due to self-expansion stress, thereby reducing the durability of concrete

Method used

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  • Accelerator for concrete spraying construction and preparation method thereof
  • Accelerator for concrete spraying construction and preparation method thereof
  • Accelerator for concrete spraying construction and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041](1) Add water to 40g of soil-grade polyglutamic acid under stirring until completely dissolved, add dropwise 2.5wt% dilute sulfuric acid solution to adjust the pH value to 3-4, then add 20g of polyethylene glycol monomethyl ether 750, add water Until the polyethylene glycol monomethyl ether 750 is completely dissolved, then heated to reflux state and kept stirring for 3 hours, the resulting mixture was concentrated under reduced pressure into a paste with a solid content of 45-55%, and cooled to 0 at a cooling rate of 5°C / min. Insulate and stir at -5°C for 30 minutes, and finally send it to a freeze dryer, and dry the obtained solid to make a fine powder through an ultrafine pulverizer, that is, polyglutamic acid / polyethylene glycol monomethyl ether;

[0042] (2) Heat polyglutamic acid / polyethylene glycol monomethyl ether to 115-125°C and keep stirring for 10 minutes, then add 5g of trimethylolpropane triacrylate and 3g of trimethylolpropane triglycidyl ether, Continue t...

Embodiment 2

[0047] (1) Add water to 45g of soil-grade polyglutamic acid under stirring until completely dissolved, add dropwise 2.5wt% dilute sulfuric acid solution to adjust the pH value to 3-4, then add 25g of polyethylene glycol monomethyl ether 750, add water Until the polyethylene glycol monomethyl ether 750 is completely dissolved, then heated to reflux state and kept stirring for 4 hours, the resulting mixture was concentrated under reduced pressure into a paste with a solid content of 45-55%, and cooled to 0 at a cooling rate of 5°C / min. Insulate and stir at -5°C for 30 minutes, and finally send it to a freeze dryer, and dry the obtained solid to make a fine powder through an ultrafine pulverizer, that is, polyglutamic acid / polyethylene glycol monomethyl ether;

[0048] (2) Heat the polyglutamic acid / polyethylene glycol monomethyl ether to 115-125° C. and keep stirring for 10 minutes, and add 10 g of trimethylolpropane triacrylate and 5 g of trimethylolpropane triglycidyl ether, C...

Embodiment 3

[0053] (1) Add water to 40g of soil-grade polyglutamic acid under stirring until completely dissolved, add dropwise 2.5wt% dilute sulfuric acid solution to adjust the pH value to 3-4, then add 20g of polyethylene glycol monomethyl ether 750, add water Until the polyethylene glycol monomethyl ether 750 is completely dissolved, then heated to reflux state and kept stirring for 3 hours, the resulting mixture was concentrated under reduced pressure into a paste with a solid content of 45-55%, and cooled to 0 at a cooling rate of 5°C / min. Insulate and stir at -5°C for 30 minutes, and finally send it to a freeze dryer, and dry the obtained solid to make a fine powder through an ultrafine pulverizer, that is, polyglutamic acid / polyethylene glycol monomethyl ether;

[0054] (2) Heat polyglutamic acid / polyethylene glycol monomethyl ether to 115-125°C and keep stirring for 10 minutes, then add 5g of trimethylolpropane triacrylate and 3g of trimethylolpropane triglycidyl ether, Continue ...

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Abstract

The invention discloses a quick-setting agent for shotcrete construction and a preparation method thereof, relates to the technical field of concrete additives, and is prepared from the following raw materials in parts by weight: 35-45 parts of polyglutamic acid, 35-45 parts of polyethylene glycol 20-25 parts of methyl ether, 15-20 parts of superfine wollastonite powder, 5-10 parts of trimethylolpropane triacrylate, 5-10 parts of cationic polyacrylamide, 1-10 parts of trimethylolpropane triglycidyl ether 5 parts, 1-5 parts of microcrystalline cellulose, 0.5-2 parts of asphalt emulsifier, 0.5-2 parts of hydrogenated castor oil. The quick-setting agent prepared by the present invention belongs to the solid non-alkali type accelerator. The solid form of existence avoids the problem that the liquid accelerator is easy to precipitate and precipitate after the storage time is too long, thereby affecting the quick-setting effect. The existence form of the non-alkali type avoids The hidden dangers of alkali-aggregate reaction and corrosion of steel bars exist in the use of alkali-containing accelerators.

Description

Technical field: [0001] The invention relates to the technical field of concrete additives, in particular to an accelerator for shotcrete construction and a preparation method thereof. Background technique: [0002] Shotcrete is a construction method of spraying and pouring fine stone concrete with a pressure spray gun. It is often used for pouring tunnel linings, walls, ceilings and other thin-walled structures or linings of other structures and protective layers of steel structures. Shotcrete is to put pre-prepared cement, sand, gravel, water and a certain amount of admixture into the sprayer, use high-pressure air to send it to the nozzle and mix it with the accelerator, and spray it to the rock at a high speed. or concrete surface. [0003] At present, accelerators are usually alkali-containing accelerators, among which aluminate accelerators are relatively effective in wet-mix shotcrete projects, and the setting time is shorter than that of alkali-free accelerators. T...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/38C04B28/02C04B103/12
CPCC04B40/0039C04B28/02C04B2103/12C04B2201/50C04B24/123C04B24/32C04B14/043C04B24/045C04B24/2652C04B24/023C04B24/383C04B24/36C04B24/085C04B14/06C04B14/02C04B2103/302
Inventor 马多浩
Owner 马多浩
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