Polymer low-alkaline accelerator used for sprayed concrete and preparation method thereof

A sprayed concrete and polymer technology, applied in the field of building materials, can solve the problems of concrete strength and durability decline, alkali content alkali aggregate reaction, etc., to reduce the rebound rate, solve the later strength and durability decline, and improve the acceleration The effect of coagulation and early strength performance

Inactive Publication Date: 2019-10-22
陕西金石混凝土科技发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to provide a polymer low-alkali quick-setting agent for shotcrete against the influence of traditional powder quick-setting agents on the quality of concrete, which solves the problem that the existing cement quick-setting agents have a high alkali content and are prone to alkali-aggregate reaction Problems that lead to a decrease in the strength and durability of concrete in the later stages

Method used

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  • Polymer low-alkaline accelerator used for sprayed concrete and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0027]Take the following raw materials in weight percentage: aluminum hydroxide (industrial first-grade product): 42%, sodium hydroxide: 28%, tap water: 30%; add the above raw materials in the reactor once and stir and heat, and the reaction temperature is controlled at 80 ~120°C, the reaction time is controlled within 1~2h, and the sodium aluminate solution can be obtained.

[0028] Take the following raw materials in terms of weight percentage: phosphoric acid (industrial first-class product): 20%, tungstic acid: 20%, sodium hydroxide: 40%, tap water: 20%; add the above raw materials into the reactor at one time and stir and heat, and react The temperature is controlled at 50-70°C, and the reaction time is controlled at 0.5-1 hour to obtain a sodium phosphotungstate solution.

[0029] Take 20 parts of sodium aluminate solution and 10 parts of sodium phosphotungstate solution prepared above, mix and stir to raise the temperature to 60°C, then add 5 parts of polyacrylamide, 5 ...

Embodiment 2

[0031] Take the following raw materials in weight percentage: aluminum hydroxide (industrial first-grade product): 42%, sodium hydroxide: 28%, tap water: 30%; add the above raw materials in the reactor once and stir and heat, and the reaction temperature is controlled at 80 ~120°C, the reaction time is controlled within 1~2h, and the sodium aluminate solution can be obtained.

[0032] Take the following raw materials in weight percentage: phosphoric acid (industrial first-class product): 30%, tungstic acid: 20%, sodium hydroxide: 40%, tap water: 10%; add the above raw materials into the reactor at one time, stir and heat, and react The temperature is controlled at 50-70°C, and the reaction time is controlled at 0.5-1 hour to obtain a sodium phosphotungstate solution.

[0033] Take 30 parts of sodium aluminate solution and 10 parts of sodium phosphotungstate solution prepared above, mix and stir to raise the temperature to 60°C, then add 5 parts of polyoxyethylene ether, 5 part...

Embodiment 3

[0035] Take the following raw materials in weight percentage: aluminum hydroxide (industrial first-grade product): 42%, sodium hydroxide: 28%, tap water: 30%; add the above raw materials in the reactor once and stir and heat, and the reaction temperature is controlled at 80 ~120°C, the reaction time is controlled within 1~2h, and the sodium aluminate solution can be obtained.

[0036] Take the following raw materials in terms of weight percentage: phosphoric acid (industrial first-grade product): 30%, tungstic acid: 10%, sodium hydroxide: 40%, tap water: 20%; add the above raw materials into the reactor at one time and stir and heat, and react The temperature is controlled at 50-70°C, and the reaction time is controlled at 0.5-1 hour to obtain a sodium phosphotungstate solution.

[0037] Take 30 parts of sodium aluminate solution and 20 parts of sodium phosphotungstate solution prepared above, mix and stir to raise the temperature to 60°C, then add 5 parts of polyoxyethylene e...

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Abstract

The invention provides a polymer low-alkaline accelerator used for sprayed concrete. The polymer low-alkaline accelerator used for sprayed concrete comprises the following components in percentages byweight: 20% to 30% of aluminate, 10% to 20% of phosphotungstate, 5% to 10% of a low molecular weight polymer, 5% to 10% of a high molecular weight polymer and 30% to 50% of water. Moreover, the invention also provides a preparation method of the polymer low-alkaline accelerator used for sprayed concrete. The possibility of generating an alkali-aggregate reaction is greatly reduced, the problem that the long-term strength and durability of concrete are reduced caused by the fact that the alkali-aggregate reaction occurs easily due to high alkali content in an existing cement accelerator is solved, simultaneously, the problems of large dust and great resilience in the injection process are solved through granular composition of the low molecular weight polymer and the high molecular weightpolymer, moreover, the sprayed concrete is used in a wet spraying technology, the stable period exceeds six months, different varieties of ordinary Portland cement can be initially set within three minutes under relatively low amount of admixture and finally set within ten minutes, the 1d strength of cement mortar reaches more than 7 MPa, and the 28d ratio of compressive strength is greater than 85%.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a polymer low-alkali accelerator for shotcrete and a preparation method thereof. Background technique [0002] Accelerator is an admixture widely used in shotcrete. Its function is to accelerate the hydration and hardening of cement, so that the concrete can achieve the effect of early strength, so as to meet the special requirements of construction. In the middle of the 20th century, Japan and some European countries successfully developed injection machinery and accelerators. Since then, countries such as Europe, the United States, the Soviet Union, and Japan have also successively promoted the application and development of shotcrete construction technology and accelerator production technology. With the in-depth research of sprayed concrete construction technology by foreign scholars, the sprayed concrete construction technology has gradually develope...

Claims

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Application Information

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IPC IPC(8): C04B24/32C04B103/12
CPCC04B40/0039C04B2103/12C04B22/0093C04B22/16C04B24/2652C04B24/287C04B22/002C04B24/32C04B24/2641
Inventor 王宏军徐卫星
Owner 陕西金石混凝土科技发展有限公司
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