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Light composite concrete material and application thereof

A concrete and lightweight technology, applied in earthwork drilling, shaft lining, tunnel lining, etc., can solve the problems of inability to reduce the temperature stress of the surrounding rock around the tunnel, freeze-thaw damage, insulation board falling off, etc., and improve the resistance to freeze-thaw damage capacity, thermal conductivity is small, and the effect of improving the load-carrying capacity

Pending Publication Date: 2021-12-28
CHONGQING GUOXIANG NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it cannot reduce the temperature stress caused by the temperature change of the surrounding rock around the tunnel, and the tunnel lining structure will also be damaged by freezing and thawing caused by the temperature change of the surrounding rock.
In addition, the insulation board is not firmly bonded to the surface of the tunnel lining, and the insulation board often falls off, which affects the safety of driving in the tunnel

Method used

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  • Light composite concrete material and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A preparation method of lightweight composite concrete material, said method comprising the steps of:

[0035] A, after selecting 1500 grams of cement, 500 grams of fly ash, 100 grams of polypropylene foam particles, 300 grams of calcium carbonate and 100 grams of alkaline earth metal sodium carbonate according to the corresponding proportions, the solid mixed material is obtained;

[0036] B. After mixing the above-mentioned solid mixed material with 750 grams of water, the finished product is obtained.

[0037] Before the initial support of the tunnel in the cold region, the lightweight composite concrete material is sprayed on the tunnel excavation contour line to form a 10cm thermal insulation and antifreeze structure.

Embodiment 2

[0039] A preparation method of lightweight composite concrete material, said method comprising the steps of:

[0040] A, after selecting 7000 grams of cement, 2500 grams of fly ash, 1200 grams of polypropylene foam particles, 2000 grams of magnesium carbonate and 1200 grams of sodium hydroxide of alkaline earth metals and mixing according to the corresponding ratio, obtain a solid mixed material;

[0041] B. After mixing the above-mentioned solid mixed material with 2780 grams of water, the finished product is obtained.

[0042] Before the initial support of the tunnel in the cold region, the lightweight composite concrete material is sprayed on the tunnel excavation contour line to form a 25cm thermal insulation and antifreeze structure.

Embodiment 3

[0044] A preparation method of lightweight composite concrete material, said method comprising the steps of:

[0045] A, select 3000 grams of cement, 1000 grams of fly ash, 200 grams of polypropylene foam particles, 500 grams of sodium bicarbonate and 200 grams of sodium silicate according to the corresponding proportions and mix to obtain a solid mixed material;

[0046] B. After mixing the above-mentioned solid mixed material with 1470 grams of water, the finished product is obtained.

[0047] Before the initial support of the tunnel in the cold region, the lightweight composite concrete material is sprayed on the tunnel excavation contour line to form a 10cm thermal insulation and antifreeze structure.

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Abstract

The invention belongs to the technical field of cold region tunnel lining heat preservation and anti-freezing materials, and discloses a light composite concrete material and application thereof. The light composite concrete material is applied to a tunnel lining cavity structure in a cold region, and is used for solving the problem of frost crack or crack of a tunnel cavity in the cold region caused by the freezing and thawing effect of the lining structure. According to the heat-preservation and anti-freezing layer obtained by spraying the light composite concrete material, the light sprayed composite concrete material is small in heat conductivity coefficient, an anti-freezing and heat-preservation layer is formed between a tunnel lining structure and surrounding rock, and the freeze-thaw damage resistance of the tunnel lining structure is improved; and in addition, the light sprayed composite concrete material and lining concrete form a whole after being solidified, and thus the bearing capacity of the tunnel lining structure is improved. The preparation process is simple and convenient to operate. Tests show that by using the heat-preservation anti-freezing light composite sprayed concrete material and the heat-preservation anti-freezing layer, a tunnel lining structure is protected from freeze-thaw damage, the use effect is good, and the concrete material is suitable for popularization and use.

Description

technical field [0001] The invention belongs to the technical field of thermal insulation and antifreeze materials for tunnel lining in cold regions, and in particular relates to a lightweight composite concrete material and its application. Background technique [0002] More and more tunnels will be built in cold regions in our country. Due to the large temperature changes in cold regions, the tunnel lining structure will bear the temperature stress caused by large temperature changes, and the surrounding rock around the tunnel will suffer from frost heaving force due to temperature changes. , directly cause freeze-thaw damage to the tunnel lining structure, cracking and leakage, and ice hanging in winter, which greatly affects the safety and stability of the tunnel structure. [0003] At present, a layer of insulation board is applied on the surface of the tunnel lining in cold regions to resist the damage of the lining from freezing and thawing. Since the insulation boar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/00C04B28/26E21D11/10E21D11/38C04B111/40C04B111/20
CPCC04B28/00C04B28/26E21D11/105E21D11/38C04B2111/00155C04B2111/40C04B2111/20C04B18/08C04B16/08C04B14/28C04B22/10C04B14/26C04B22/064C04B7/00
Inventor 刘真张斌丁燕平刘士洋潘诗意
Owner CHONGQING GUOXIANG NEW MATERIAL