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High-elasticity anti-cracking tunnel residue shotcrete material and preparation method thereof

A sprayed concrete and high-elastic technology, applied in the direction of sustainable waste treatment, solid waste management, climate sustainability, etc., can solve the problems of stacking land occupation, inconvenient transportation, and difficult handling, so as to save resources, save costs, The effect of reducing dosage

Pending Publication Date: 2019-10-22
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the hole slag produced during the excavation of the tunnel is difficult to deal with because it occupies land, is prohibited from landfilling, and is inconvenient to be transported abroad.

Method used

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  • High-elasticity anti-cracking tunnel residue shotcrete material and preparation method thereof
  • High-elasticity anti-cracking tunnel residue shotcrete material and preparation method thereof
  • High-elasticity anti-cracking tunnel residue shotcrete material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0029] A high-elasticity-cracking slag-resistant shotcrete material, the shotcrete material includes the following components: 408kg / m 3 Portland cement (specific surface area is 300 ~ 400m 2 / kg), 51kg / m 3 rubber particles (particle size 20-100 mesh), 716kg / m 3 The fine aggregate of hole slag machine-made sand (the particle size passes through the 3mm particle size sieve), 767kg / m 3 Coarse aggregate (stones with a particle size of 5-10mm), 7.65kg / m 3 Chopped basalt fiber (length 12mm ~ 35mm), 102kg / m 3 Class I fly ash (specific surface area is 300-430m 2 / kg), 1.5kg / m 3 Carboxymethylcellulose sodium salt rheological thickener, 9.2kg / m 3 Polycarboxylate superplasticizer and 25.5kg / m 3 Alkali-free liquid accelerator.

[0030] A method for preparing a high-elasticity-cracking-resistant slag sprayed concrete material, comprising the following steps:

[0031] 1) First add the Portland cement of the formula amount into the forced mixer, then add the required rubber particl...

Embodiment 2

[0036] A high-elasticity-cracking slag-resistant shotcrete material, the shotcrete material includes the following components: 460kg / m 3 Portland cement (specific surface area is 300 ~ 400m2 / kg), 110kg / m 3 rubber particles (particle size: 20-100 mesh), 720kg / m 3 The fine aggregate of hole slag machine-made sand (the particle size passes through the 3mm particle size sieve), 725kg / m 3 Coarse aggregate (stones with a particle size of 5-10mm), 5.1kg / m 3 Chopped basalt fiber (length 12mm ~ 35mm), 102kg / m 3 The fly ash microbeads (the specific surface area is 420 ~ 450m 2 / kg), 3.0kg / m 3 Carboxymethylcellulose sodium salt rheological thickener, 11.0kg / m 3 Polycarboxylate water reducer and 12.8kg / m 3 Alkali-free liquid accelerator.

[0037] A method for preparing a high-elasticity-cracking-resistant slag sprayed concrete material, comprising the following steps:

[0038] 1) First add the Portland cement of the formula amount into the forced mixer, then add the required rubb...

Embodiment 3

[0043] A high-elasticity-cracking slag-resistant shotcrete material, the shotcrete material includes the following components: 510kg / m 3 Portland cement (specific surface area is 300 ~ 400m 2 / kg), 76.5kg / m 3 rubber particles (particle size: 20-100 mesh), 767kg / m 3 The fine aggregate of the hole slag machine-made sand (the particle size passes through the 3mm particle size sieve), 691kg / m 3 Coarse aggregate (stones with a particle size of 5-10mm), 10.2kg / m 3 Chopped basalt fiber (length 12mm ~ 35mm), 21kg / m 3 Class I fly ash (specific surface area is 300-430m 2 / kg), 30kg / m 3 The fly ash microbeads (the specific surface area is 420 ~ 450m 2 / kg), 1.5kg / m 3 Carboxymethylcellulose sodium salt rheological thickener, 7.9kg / m 3 Polycarboxylate water reducer and 15.3kg / m 3 Alkali-free liquid accelerator.

[0044] A method for preparing a high-elasticity-cracking-resistant slag sprayed concrete material, comprising the following steps:

[0045] 1) First add the Portland ce...

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Abstract

The invention discloses a high-elasticity anti-cracking tunnel residue shotcrete material and a preparation method thereof, wherein the material comprises: cement, rubber particles, fine aggregate, coarse aggregate, fiber, a mineral admixture, a rheological thickener, a water reducer, and a quick-setting agent. The preparation method comprises: 1) carrying out uniform dry mixing on cement, rubberparticles and fiber according to a certain ratio, adding a mineral admixture, coarse aggregate and fine aggregate, and carrying out uniform dry mixing to obtain a mixture; 2) weighing mixing water, mixing a rheological thickener and part of the mixing water according to a certain ratio, and stirring to obtain a mixed solution; and 3) adding the mixed solution, the remaining part of the mixing water and a water reducer to the mixture, uniformly mixing, adding a quick-setting agent, and uniformly mixing to obtain the product. According to the present invention, the high-elasticity anti-crackingtunnel residue shotcrete material has working performances of light weight, high elasticity, impermeability, durability, frost resistance, crack resistance integrity and the like, and can meet the durability performance of concrete supporting structures and the requirements of modern tunnel engineering lining concrete materials.

Description

technical field [0001] The invention relates to a high-elasticity-crack-resistant slag sprayed concrete material and a preparation method thereof, belonging to the technical field of underground space support materials. Background technique [0002] With the popularization and use of the new Austrian method in tunnel and underground engineering, shotcrete has become the focus of engineering attention in various countries. The process of sprayed concrete is to mix the mixture of cement, sand, stone, water and various admixtures that is uniformly mixed and has good working performance, and is sprayed onto the surface to be sprayed at high speed with the help of compressed air. At present, the research on shotcrete is mostly rigid concrete. This type of concrete has the characteristics of high compressive strength, but it lacks toughness and low flexural strength. It is easy to crack and be damaged under thermal expansion and contraction or external force. The ability to resis...

Claims

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Application Information

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IPC IPC(8): C04B28/04C04B18/16C04B111/20C04B111/27C04B111/40C04B111/50
CPCC04B28/04C04B2111/00155C04B2111/00724C04B2111/20C04B2111/27C04B2111/29C04B2111/40C04B2111/503C04B2201/50C04B18/22C04B14/4656C04B18/08C04B14/02C04B24/383C04B2103/302C04B2103/12C04B18/16C04B18/082Y02W30/91
Inventor 张云升翟胜田石加顺田龙岗戴国亮蒋建荣朱贤宇吴维莉乔宏霞
Owner SOUTHEAST UNIV
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