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Tunnel sprayed concrete and preparation method thereof

A tunnel shotcrete and concrete technology, applied in sustainable waste treatment, solid waste management, climate sustainability, etc., can solve the problems of poor impermeability and air tightness of shotcrete, unable to meet performance requirements, etc., and achieve enhanced compactness, The effect of increasing strength and resolving effects

Inactive Publication Date: 2019-12-20
GUIZHOU HIGHWAY ENG GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, due to its poor impermeability and air tightness, conventional shotcrete cannot meet the above-mentioned performance requirements for tunnel use

Method used

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  • Tunnel sprayed concrete and preparation method thereof
  • Tunnel sprayed concrete and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A tunnel shotcrete, based on the volume of the tunnel shotcrete, including the following components: cement 360kg / m 3 , Coarse sand 818kg / m 3 , Gravel 817kg / m 3 , basalt fiber 1.5kg / m 3 , fly ash 90kg / m 3 , accelerator 8kg / m 3 , water reducer 5kg / m 3 .

[0023] The fineness modulus of the coarse sand is 3.3, and the stone powder content in the coarse sand is 7%; the particle size of the gravel is 5mm.

[0024] The length of the basalt fiber is 10mm.

[0025] The accelerator is an alkali-free accelerator; the water reducer is an air-entraining water reducer.

[0026] A method for preparing shotcrete for tunnels, comprising the following steps: after dry-mixing basalt fibers with cement, coarse sand, crushed stones and fly ash, adding a water reducer and an appropriate amount of water for mixing, and finally adding Accelerator, the dry mixing time is 90s, and the mixing time is 90s.

Embodiment 2

[0028] A tunnel shotcrete, based on the volume of the tunnel shotcrete, including the following components: cement 380kg / m 3 , Coarse sand 836kg / m 3 , Gravel 804kg / m 3 , basalt fiber 2.5kg / m 3 , fly ash 92kg / m 3 , accelerator 10kg / m 3 , water reducer 6kg / m 3 .

[0029] The fineness modulus of the coarse sand is 3.3, and the stone powder content in the coarse sand is 7%; the particle size of the gravel is 7mm.

[0030] The length of the basalt fiber is 15 mm.

[0031] The accelerator is a low-alkali accelerator; the water reducer is an air-entraining water reducer.

[0032] A method for preparing shotcrete for tunnels, comprising the following steps: after dry-mixing basalt fibers with cement, coarse sand, crushed stones and fly ash, adding a water reducer and an appropriate amount of water for mixing, and finally adding Accelerator, the dry mixing time is 100s, and the mixing time is 120s.

Embodiment 3

[0034] A tunnel shotcrete, based on the volume of the tunnel shotcrete, including the following components: cement 425kg / m 3 , Coarse sand 845kg / m 3 , gravel 800kg / m 3 , basalt fiber 3kg / m 3 , fly ash 95kg / m 3 , accelerator 12kg / m 3 , water reducer 8kg / m 3 .

[0035] The fineness modulus of the coarse sand is 3.3, and the stone powder content in the coarse sand is 7%; the particle size of the gravel is 10 mm.

[0036] The length of the basalt fiber is 18mm.

[0037] The accelerator is an alkali-free accelerator; the water reducer is an air-entraining water reducer.

[0038] A method for preparing shotcrete for tunnels, comprising the following steps: after dry-mixing basalt fibers with cement, coarse sand, crushed stones and fly ash, adding a water reducer and an appropriate amount of water for mixing, and finally adding Accelerator, the dry mixing time is 110s, and the mixing time is 120s.

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Abstract

The invention relates to the technical field of tunnel construction, and particularly discloses a tunnel sprayed concrete. The tunnel sprayed concrete comprises the components based on the volume of tunnel sprayed concrete of 360-500 kg / m3 of cement, 818-890kg / m3 of coarse sand, 789-817kg / m3 of broken stone, 1.5-4.5kg / m3 of basalt fiber, 90-98kg / m3 of fly ash, 8-20kg / m3 of accelerator and 5-10kg / m3 of water reducing agent. The invention also discloses a preparation method of the tunnel sprayed concrete. By adding the fly ash, the strength, the bending strength and the permeability resistance of the concrete are improved; meanwhile, the compactness of the concrete is effectively improved, the effect of preventing weak base water damage can be achieved, and the durability of the concrete isimproved; through the addition of basalt fiber doping, the bending strength is gradually improved, the condition that concrete is cracked under a high stress section can be effectively prevented, theconcrete construction performance is good, the spraying speed is high, and the rebound amount is small; and compared with common sprayed concrete, the concrete doped with basalt fibers can save 1 / 3 ofspraying time.

Description

technical field [0001] The invention relates to the technical field of tunnel construction, in particular to a tunnel shotcrete and a preparation method thereof. Background technique [0002] Tunnel is a form of people's use of underground space. It can solve the problem of people and vehicles on the ground competing for roads, and can also reduce driving distance and connect the two sides of the Taiwan Strait. In order to meet the requirements of the tunnel, the tunnel should have high stress and high gas , The characteristics of weak alkaline water. [0003] However, due to its poor impermeability and air tightness, conventional shotcrete cannot meet the above-mentioned performance requirements for tunnel use. Contents of the invention [0004] The object of the present invention is to provide a tunnel sprayed concrete to solve the problems raised in the above background technology. [0005] To achieve the above object, the present invention provides the following tech...

Claims

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Application Information

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IPC IPC(8): C04B28/00C04B18/08C04B14/46C04B111/27
CPCC04B28/00C04B2111/00155C04B2111/00724C04B2111/27C04B2201/50C04B14/06C04B14/02C04B14/4656C04B18/08C04B2103/12C04B2103/302Y02W30/91
Inventor 田力冉隆举杨智成喻兴洪焦华张金秋胡洪丽
Owner GUIZHOU HIGHWAY ENG GRP
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