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Concrete for thermal damage tunnels

A concrete and tunnel technology, applied in the field of building materials, can solve problems such as poor durability, unfavorable project management department organization and management, structural damage, etc., and achieve the effect of reducing thermal stress cracking

Active Publication Date: 2021-06-29
四川铁拓科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But this invention is not conducive to the on-site construction organization and management of the project manager department
[0006]Therefore, the lining concrete of heat-damaged tunnels has the problems of early structural damage, wide cracks and poor durability in the later stage, and the construction process is complicated
In addition, the problem of high operating temperature in heat-damaged tunnels needs to be resolved

Method used

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  • Concrete for thermal damage tunnels
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Experimental program
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Embodiment 1

[0048] In this embodiment, the anti-crack self-repairing cement clinker includes 4% square magnesium stone, and 3 ~ 5μm square magnesium content of 0.4%, γ-C 2 The S content is 5%; the anti-crack self-repairing cement, more than 65 μm cement particles account for 15%.

[0049] Fly ash bouncing beads 250kg / m 3 1 to 200 μm of the particle diameter, the static pressure intensity is 80 MPa, the thermal conductivity is 0.1 w / (m · k). Lightweight ceramics accumulation density 300kg / m 3 5 to 10 mm of particle diameter, 1 MPa, and 1 h water absorption of 25%.

[0050] Mine powder specific surface area 425m 2 / kg, 7D active index of 80%, 28D active index 98%, flow rate ratio 101%. Silicon ash than 18M 2 / g, 7D active index (7D fast method) 110%, SIO 2 The content is 95%, the amount of water is more than 118%. The water storage agent is carboxymethylcellulose ether. The water reduction is a high-performance water reducing agent having a polycarboxylic acid, a solid content of 20%, a...

Embodiment 2

[0052] In this embodiment, the anti-crack self-repairing cement clinker includes 5.5% square magnesium stone, and 3 to 5 μm squares content of 0.7%, γ-C 2 The S content is 3%; the anti-crack self-repairing cement, more than 65 μm cement particles account for 20%.

[0053] Fly ash boustic bead 350kg / m 3 The particle diameter is 50 to 150 μm, the static pressure intensity is 90 MPa, and the thermal conductivity is 0.21 w / (m · k). Lightweight ceramics accumulation density 350kg / m 3 The particle diameter is 5 to 10 mm, the cylindrical strength is 1.4 MPa, and the water absorption rate of 1 h is 19%.

[0054] Mine powder specific surface area 400m 2 / kg, 7d active index is 70%, and the 28D active index is 95%, the flow rate is 95%. Silicon ash specific surface area 15m 2 / g, 7D active index (7D fast method) 105%, SIO 2 The content of 85%, the amount of water is 125%. The water retention agent is a phosphate starch. The water reduction is a high-performance water reducing agent ...

Embodiment 3

[0056] In this embodiment, the anti-crack self-repairing cement clinker includes 6.8% square magnesium stone, and 3 to 5 μm square mite content of 0.9%, γ-C 2 The S content is 2%; the anti-crack self-repairing cement, more than 65 μm cement particles account for 23%.

[0057] Fly ash bouncing bead 405kg / m 3 100 to 200 μm of the particle diameter, the static pressure strength 130 MPa, the thermal conductivity is 0.35 w / (m · k). Lightweight ceramics stacking density 420kg / m 3 The particle size is 5 to 10 mm, the cylindrical strength is 1.8 MPa, and the water absorption rate of 1 h is 15%.

[0058] Mine powder specific surface area 427m 2 / kg, 7d active index 75%, 28D active index 98%, and the flow rate is 101%. Silicon ash than 18M 2 / g, 7D active index (7D fast method) 110%, SIO 2 The content is 95%, the amount of water is 121%. The water retention agent is hydroxypropyl cellulose. The water reduction is a high-performance water reducing agent having a polycarboxylic acid, ...

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Abstract

The invention relates to the technical field of building materials, in particular to concrete for thermal damage tunnels. The concrete comprises the following raw materials by weight: 250-340kg / m<3> of anti-crack self-repairing cement; 30-120 kg / m<3> of mineral powder; 20-50kg / m<3> of silica fume; 10-45 kg / m<3> of fly ash floating beads; 35-140kg / m<3> of light ceramsite; 2-5 kg / m<3> of a water-retaining agent; and 3.1-3.4 kg / m<3> of a water reducing agent. The anti-crack self-repairing cement is prepared from 90-95% of anti-crack self-repairing cement clinker and 5-10% of dihydrate gypsum. The anti-cracking self-repairing cement clinker is prepared from 4-8% of periclase and 1-5% of gamma-C2S, and the periclase with the size of 3-5 microns accounts for 0.4-1.2%. The concrete can effectively solve the problem of structural damage of lining concrete in the early stage, can reduce the width of cracks in the later stage, has a heat preservation and insulation function, and can reduce the temperature of the operation environment to a certain extent.

Description

Technical field [0001] The present invention relates to the field of building materials, and more particularly to a concrete for thermal damage tunnels. Background technique [0002] One of the four four major projects in my country - Qinghai-Tibet Railway is the highest in Shanghai, the highest line of lines, and has 10 high-level tunnels along the high-level temperature tunnel along the line, and the land temperature range is in the range of 30 to 89 ° C. A comprehensive impact on geological structure, construction and other factors, the tunnel exhibits a significant high grease characteristics, the initial support of the tunnel and the secondary lining heat is serious. Thermal damage not only cracks the lining concrete structure, but the extreme bearing capacity is reduced, but also deteriorates the operational environment and improves operating costs. [0003] In general, high-ground temperature (more than 50 ° C) tunnel construction typically uses a heat insulating lining, i...

Claims

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Application Information

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IPC IPC(8): C04B28/04C04B18/02C04B18/08C04B18/12C04B18/14C04B24/38C04B103/46
CPCC04B28/04C04B18/027C04B18/082C04B18/146C04B18/12C04B24/383C04B24/243C04B2103/465C04B2201/50C04B2201/32C04B2103/302Y02W30/91
Inventor 谭永杰王开云潘自立刘名君王建盛东怀正李永亮钟文王宁林燕滕银见夏艳晴范有银
Owner 四川铁拓科技有限公司
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