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Self-repairing cement for thermal damage tunnel

A self-repairing and tunneling technology, applied in the field of building materials, can solve the problems of lining concrete structure damage, narrowing crack width, poor durability of concrete, etc., and achieve the effects of reducing water loss, reducing plastic shrinkage, and being easy to grind

Active Publication Date: 2021-06-25
JIAHUA SPECIAL CEMENT +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the above-mentioned technical problems, the present invention proposes a self-repairing cement for heat-damaged tunnels, which can effectively solve the problems of early structural damage of lining concrete, wide cracks in the later stage and poor durability of concrete, and can reduce the risk of early cracking of concrete and the occurrence of cracks Finally, the crack width can be reduced to ensure the early and long-term normal function of the tunnel concrete

Method used

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  • Self-repairing cement for thermal damage tunnel
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  • Self-repairing cement for thermal damage tunnel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] The particle distribution of component A is implemented as follows: 65 μm particles account for 0%. γ-C in the clinker of this component 2 The S content is 1%, the periclase (MgO crystal) content is about 4%, and the size of the periclase is less than 1 μm.

[0050] The particle distribution of component B is as follows: 65 μm particles account for 47%. The cement clinker in component B cools slowly, making part C 2 S transforms from β-type to γ-type, and γ-C in the clinker of this component 2 The S content is 5%; the periclase content in the clinker is about 2%, and the size is 3 μm.

[0051] Clay brick powder Al 2 o 3 The content is 40%, and the particle distribution is as follows: 150 μm particles account for 0%.

[0052] CaCO 3 The whiskers have a diameter of 0.5 μm, a length of 20 μm, and an aspect ratio of 40.

Embodiment 2

[0054] The particle distribution of component A is implemented as follows: 65 μm particles account for 5%. γ-C in the clinker of this component 2 The S content is 1.5%, the periclase (MgO crystal) content is about 3.5%, and the size of the periclase is less than 1 μm.

[0055] The particle distribution of component B is as follows: 65 μm particles account for 69%. The cement clinker in component B cools slowly, making part C 2 S transforms from β-type to γ-type, and γ-C in the clinker of this component 2 The S content is 15%; the periclase content in the clinker is about 3%, and the size is 5 μm.

Embodiment 3

[0057] The particle distribution of component A is implemented as follows: 65 μm particles account for 3%. γ-C in the clinker of this component 2 The S content is 1%, the periclase (MgO crystal) content is about 4%, and the size of the periclase is less than 1 μm.

[0058] The particle distribution of component B is as follows: 65 μm particles account for 58%. The cement clinker in component B cools slowly, making part C 2 S transforms from β-type to γ-type, and γ-C in the clinker of this component 2 The S content is 10%; the periclase content in the clinker is about 4%, and the size is 3.5 μm.

[0059] Clay brick powder Al 2 o 3 The content is 46%, and the particle distribution is as follows: 150 μm particles account for 5%.

[0060] CaCO 3 The whiskers have a diameter of 0.5 μm, a length of 10 μm, and an aspect ratio of 20.

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Abstract

The invention relates to the technical field of building materials, in particular to self-repairing cement for a thermal damage tunnel, the self-repairing cement is prepared from the following raw materials in percentage by mass: 67-89.5% of component A, 10-20% of component B, 0-10% of clay brick powder, 0.5-2% of CaCO3 whisker and 0-1% of water-retaining agent; each of the component A and the component B comprises 90-95% of self-repairing cement clinker and 5-10% of dihydrate gypsum; the self-repairing cement clinker is prepared from 20-30% of C3S, 35-55% of C2S, 1-3% of C3A, 17-26% of C4AF and 4-8% of MgO; the size of periclase in the self-repairing cement clinker of the component A is less than 1 [mu] m; the size of periclase in the self-repairing cement clinker of the component B is 35 [mu] m, and the particle size of 47-69% of the component B is greater than 65 [mu] m. Through the self-repairing cement, the problems of early structural damage, wide later cracks and poor durability of lining concrete can be effectively prevented.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to a self-repairing cement used in heat damaged tunnels. Background technique [0002] One of my country's four major projects in the new century, the Qinghai-Tibet Railway, is the plateau railway with the highest altitude and the longest line in the world. According to preliminary statistics, there are 10 high-temperature tunnels along the line, and the ground temperature ranges from 30 to 89°C. Affected by geological structure, construction and other factors, the tunnel shows obvious characteristics of high ground temperature. Both the main tunnel and the horizontal tunnel are located in a wide range of high-temperature and ultra-high-temperature sections, and the primary support and secondary lining of the tunnel are seriously damaged by heat. Heat damage causes excessive temperature difference between the inner and outer sides of the tunnel lining structure, resulting...

Claims

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Application Information

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IPC IPC(8): C04B28/14
CPCC04B28/14C04B2201/50C04B2111/00724C04B7/02C04B14/383C04B18/16C04B2103/465
Inventor 许毅刚郑长青刘名君王建盛东怀正李永亮刘剑光何强谭永杰王开云钟文王宁林燕夏艳晴范有银滕银见
Owner JIAHUA SPECIAL CEMENT
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