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Admixture special for high performance shotcrete

A technology of sprayed concrete and admixtures, which is applied in the field of construction engineering materials, can solve the problems of high rebound rate and insufficient early strength, and achieve the effect of improving early strength, increasing the thickness of one shot, and reducing the rebound rate of shotcrete

Active Publication Date: 2019-08-09
RAILWAY ENG RES INST CHINA ACADEMY OF RAILWAY SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] By increasing the cohesion and early strength of shotcrete to solve the problems of high rebound rate and insufficient early strength, that is, a special admixture for high-performance shotcrete according to the present invention includes two core components: cohesive component and early strength components

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The mass parts of each component of the special admixture for shotcrete are:

[0021] 21 parts of modified latex powder; 24.5 parts of silica fume, 24.5 parts of ultrafine mineral powder; 30 parts of highly active tricalcium aluminate.

[0022] The amount of special admixture for high-performance shotcrete is 5% of the amount of cementitious material, and the amount of quick-setting agent in this test is 7% of the total mass of cementitious material, which is added at the nozzle. The mix ratio of shotcrete mixed with the special admixture is shown in the table below.

[0023] Ordinary Portland Cement Special Admixture fly ash sand stone water Superplasticizer accelerator 370 22.5 80 750 950 195 1.0% 7%

[0024] After adding the special admixture, the rebound rate of the side wall is 3% and the rebound rate of the vault is 5% during the above concrete spraying process. Through core sampling, the compressive strength of shotcrete 1d...

Embodiment 2

[0026] The mass parts of each component of the special admixture for shotcrete are:

[0027] 21 parts of modified latex powder; 24.5 parts of silica fume, 24.5 parts of ultrafine mineral powder; 30 parts of highly active tricalcium aluminate.

[0028] The dosage of the special admixture for high-performance shotcrete is 10% of the cement dosage, and the dosage of the quick-setting agent in this test is 7% of the total mass of the cementitious material, which is added at the nozzle. The mix ratio of shotcrete mixed with the special admixture is shown in the table below.

[0029] Ordinary Portland Cement Special Admixture fly ash sand stone water Superplasticizer accelerator 360 44 80 750 950 195 1.0% 7%

[0030] After adding the special admixture, the rebound rate of the side wall and the vault are 3% during the above concrete spraying process. Through core sampling, the compressive strength of shotcrete 1d is 20.9MPa.

[0031] From the ...

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Abstract

Belonging to the technical field of construction engineering, the invention in particular relates to an admixture special for high performance shotcrete. The special admixture comprises two main components: a cohesive component and an early strength component in a mass ratio of 60-70:30-40. Specifically, the cohesive component is a mixture of modified latex powder and a superfine mineral admixturein a mass ratio of 20-30:70-80, and the early strength component is high activity tricalcium aluminate. Through the synergistic effect of the cohesive component and the early strength component, thespecial admixture provided by the invention effectively improves the cohesiveness and early strength of shotcrete, thereby reducing the resilience of shotcrete and improving the compactness. The material can provide an effective way for really realizing high performance of shotcrete.

Description

technical field [0001] The invention belongs to the technical field of building engineering materials, in particular to a special admixture for high-performance shotcrete. Background technique [0002] Shotcrete is an important part of tunnel engineering, and its construction performance and service state are important factors affecting the construction progress and later use state of tunnel engineering. Shotcrete can be divided into dry spraying and wet spraying according to the construction process. Among them, dry sprayed concrete is rarely used at present due to serious dust pollution during construction and greater harm to construction personnel. The use of the wet spraying method effectively reduces the dust pollution during the spraying process, and the rebound rate of the sprayed concrete is reduced, and the construction efficiency is significantly improved. Therefore, the wet spraying method has become the main construction method of shotcrete in tunnels. However...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04
CPCC04B28/04C04B2201/50C04B2111/00724C04B2111/00155C04B2103/0045C04B18/146C04B18/12C04B22/0093C04B18/08C04B14/06C04B14/02C04B2103/302C04B2103/12
Inventor 王家赫谢永江仲新华李享涛渠亚男李连吉孔庆欣裘智辉
Owner RAILWAY ENG RES INST CHINA ACADEMY OF RAILWAY SCI
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