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Special water reducer for railway tunnel construction sprayed concrete

A shotcrete and tunnel construction technology, applied in the field of new concrete materials, can solve the problems of low early strength, poor durability, and large amount of rebound, so as to improve early strength and durability, extend expansion, and increase cohesion. Effect

Inactive Publication Date: 2018-06-08
贵州天威建材科技有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention proposes a special water reducing agent for shotcrete used in railway tunnel construction to solve the problems of low early strength, large rebound and poor durability of shotcrete.

Method used

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  • Special water reducer for railway tunnel construction sprayed concrete
  • Special water reducer for railway tunnel construction sprayed concrete

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A special water reducer for sprayed concrete in railway tunnel construction. The special water reducer is composed of common polycarboxylate high-performance water reducer mother liquor, TW-BM series polycarboxylate slump retaining agent mother liquor, viscosity regulator, and air-entraining agent , early strength agent compound composition, the ratio of each component converted into solid content is: ordinary polycarboxylate high-performance water reducer mother liquor 3%; TW-BM series polycarboxylate slump retaining agent 12%, air-entraining 0.05% agent, 0.5% viscosity modifier, 0.5% early strength agent, and the rest is water.

[0023] The common polycarboxylate high-performance water reducer mother liquor is a lipid polycarboxylate high-performance water reducer mother liquor.

[0024] The compounded special water reducer has a chloride ion solid content of less than 0.05%.

[0025] The TW-BM series polycarboxylate slump-retaining agent is composed of the following...

Embodiment 2

[0034] A special water reducer for sprayed concrete in railway tunnel construction. The special water reducer is composed of common polycarboxylate high-performance water reducer mother liquor, TW-BM series polycarboxylate slump retaining agent mother liquor, viscosity regulator, and air-entraining agent , early strength agent compound composition, the proportion of each component converted into solid content is: ordinary polycarboxylate high-performance water reducer mother liquor 4%; TW-BM series polycarboxylate slump retaining agent 10%, air-entraining 0.1% of agent, 0.7% of viscosity modifier, 1% of early strength agent, and the rest is water.

[0035] The common polycarboxylate high-performance water-reducer mother liquor, and the ether-based polycarboxylate high-performance water-reducer mother liquor.

[0036] The compounded special water reducer has a chloride ion solid content of less than 0.05%.

[0037] The TW-BM series polycarboxylate slump-retaining agent is comp...

Embodiment 3

[0046] A special water reducer for sprayed concrete in railway tunnel construction. The special water reducer is composed of common polycarboxylate high-performance water reducer mother liquor, TW-BM series polycarboxylate slump retaining agent mother liquor, viscosity regulator, and air-entraining agent , early strength agent compound composition, the proportion of each component converted into solid content is: ordinary polycarboxylate high-performance water reducer mother liquor 8%; TW-BM series polycarboxylate slump retaining agent 15%, air-entraining 0.3% agent, 1% viscosity modifier, 2% early strength agent, and the rest is water.

[0047] The common polycarboxylate high-performance water-reducer mother liquor includes lipid or ether polycarboxylate high-performance water-reducer mother liquor.

[0048] The compounded special water reducer has a chloride ion solid content of less than 0.05%.

[0049] The TW-BM series polycarboxylate slump-retaining agent is composed of ...

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Abstract

The invention belongs to the technical field of new concrete materials, and particularly relates to a special water reducer for a railway tunnel construction sprayed concrete. An adverse effect of a retarder on an accelerator is eliminated; without influencing a setting performance of the concrete, longer-time stability of a working performance of the concrete is maintained; through adding a viscosity modifier and adjusting the air content, the sprayed concrete has better cohesiveness and can be easily adhered onto a tunnel rock wall, so that the number of rebound and drop of the sprayed concrete is reduced, and the aims of reducing the waste of the sprayed concrete and improving the durability of the concrete are achieved; meanwhile, through appropriately adding an organic early strengthcomponent, the early strength of the sprayed concrete is improved.

Description

technical field [0001] The invention belongs to the technical field of new concrete materials, and in particular relates to a special water reducing agent for sprayed concrete in railway tunnel construction. Background technique [0002] Shotcrete is a fast-setting concrete used to strengthen and protect structures or rock surfaces. This technology uses compressed air or other power to inject a mixture of cement, sand, stones and admixtures in a certain proportion to the surface to be sprayed through the nozzle, and within a few minutes Concrete reinforcement formed by internal condensation and hardening. Shotcrete generally does not use templates, which achieves saving investment, reducing costs, speeding up construction progress, fast strength growth, good compactness, simple construction preparation, strong adaptability, etc., and has supporting, filling, isolating and transforming functions. . These advantages of shotcrete make it widely used in mines, shafts, traffic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/32C04B28/04C04B103/30
CPCC04B28/04C04B40/0039C04B2103/302C04B2111/00155C04B2201/50C04B24/32C04B24/04C04B24/045C04B24/16C04B22/14C04B24/26C04B24/122C04B14/02C04B14/06C04B2103/12
Inventor 曾炽杨彰林刘远邓怡玄王艳书陶佳
Owner 贵州天威建材科技有限责任公司
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