Micro-expansion grouting material for grouting tunnel lining vault with mold

A technology of micro-expansion and grouting material, which is applied in the field of grouting materials for tunnel lining vaults, can solve the problems of low bonding strength margin, cracking, and low 7d strength, so as to improve the freeze-thaw aging resistance and improve Dispersion, stability, strength, no shrinkage and no cracking

Active Publication Date: 2018-09-21
WUHAN YUANJIN BUILDING MATERIALS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Chinese patent CN107935516A discloses a micro-expansion grouting material used for tunnel lining vault belt mold grouting. There are quality defects such as voids and cracks in the vault
The grouting material has the following disadvantages: 1. The formula cost of the invention is relatively expensive, which is not convenient for construction engineering application; 2. The formula contains a retarder, which is difficult to control the 12h strength, and it is difficult to ensure the 12h mechanical strength of the grouting material; 3. In the test results of the performance indicators of the embodiment, the 7d strength is low, and the surplus value of the bonding strength with the concrete is not high, so it is difficult to estimate the bonding performance of the configured micro-expansion grouting material and the lining concrete in the later stage; 4. The performance of the embodiment In the index detection results, there is a lack of detection of the combination performance of micro-expansion grouting material and RPC grouting pipe
[0008] In addition, the expansion agent in the prior art is generally fully expanded in the plastic stage of the grouting material, and there is basically no expansion after the grouting material is hardened, so it is impossible to guarantee the expansion amount of the grouting material in the later stage of curing, and it is easy to shrink due to continued hydration in the later stage form cracks

Method used

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  • Micro-expansion grouting material for grouting tunnel lining vault with mold
  • Micro-expansion grouting material for grouting tunnel lining vault with mold
  • Micro-expansion grouting material for grouting tunnel lining vault with mold

Examples

Experimental program
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Effect test

Embodiment 1

[0046] This example is made of the following raw materials in mass percentage: 55.42% cement, 38% graded aggregate, 2.0% viscosity modifier, 4% expansion agent, 0.30% early strength agent, 0.25% water reducing agent, water retaining agent 0.02%, defoamer 0.01%; the cement is composed of 91% of ordinary Portland cement with a cement strength grade of 52.5 and 9% of sulphoaluminate cement with a cement strength grade of 42.5 by mass percentage; The graded aggregate is composed of the following quartz sand by mass percentage: 82% of 70-100 mesh quartz sand, 18% of 100-200 mesh quartz sand; Base cellulose ether and Brunei gum; the expansion agent is compounded by 1% ammonium azodicarboxylate and 99% magnesium oxide in mass percentage; the viscosity modifier is fly ash extract, and its accumulation Density≥700kg / m 3 , silica content ≥ 50%, aluminum oxide content ≥ 20%; the water reducer is a polycarboxylate water reducer, and the water reducing rate of the mortar is ≥ 25%; the def...

Embodiment 2

[0056] A micro-expansion grouting material for tunnel lining vault grouting with mold in this embodiment has 54.0% cement, 40% graded aggregate, 3.0% viscosity modifier, 2.5% expansion agent, 0.21% early strength agent, and 0.26% of water agent, 0.01% of water-retaining agent, and 0.02% of defoamer; the cement is ordinary Portland cement with a strength grade of 52.5; the graded aggregate is composed of the following quartz sand by mass percentage: 70-100 85% of mesh quartz sand, 15% of 100-200 mesh quartz sand; the water-retaining agent is xanthan gum; the expansion agent is composed of 1% p-toluenesulfonyl hydrazide and 99% magnesium oxide according to mass percentage; The viscosity modifier is a fly ash extract with a bulk density ≥ 700kg / m 3 , silica content ≥ 50%, aluminum oxide content ≥ 20%; the water reducer is a polycarboxylate water reducer, and the water reducing rate of the mortar is ≥ 25%; the defoamer is a polyether modified Non-toxic silicone defoamer. Its pre...

Embodiment 3

[0058] A micro-expansion grouting material for tunnel lining vault grouting with mold in this embodiment has 60% cement, 35% graded aggregate, 2.0% viscosity modifier, 2.7% expansion agent, 0.05% early strength agent, and 0.20% of water agent, 0.03% of water retaining agent, and 0.02% of defoamer; the cement is ordinary Portland cement with a strength grade of 52.5; the graded aggregate is composed of the following quartz sand by mass percentage: 70-100 80% of mesh quartz sand, 20% of 100-200 mesh quartz sand; the water-retaining agent is ethyl cellulose ether; the expansion agent is composed of 1% iminodiacetonitrile and 99% magnesium oxide by mass percentage ; The viscosity modifier is a fly ash extract with a bulk density ≥ 700kg / m 3 , silica content ≥ 50%, aluminum oxide content ≥ 20%; the water reducer is a polycarboxylate water reducer, and the water reducing rate of the mortar is ≥ 25%; the defoamer is a polyether modified Non-toxic silicone defoamer. Its preparation ...

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Abstract

The invention discloses a micro-expansion grouting material for grouting a tunnel lining vault with a mold. The micro-expansion grouting material is made of, by mass, 52.5-60% of cement, 35-40% of graded aggregate, 2-3% of viscosity modifier, 0.02-4% of expansion agent, 0.03-0.43% of early strength agent, 0.2-0.26% of water reducing agent, 0.01-0.03% of water retention agent and 0.01-0.02% of defoaming agent; the cement is one or more of Portland cement, ordinary Portland cement and sulphate aluminium cement, and the strength level of the cement is not lower than 42.5; the water retention agent is one or more of a cellulose ether polymer compound and biopolysaccharide gum. The micro-expansion grouting material for grouting the tunnel lining vault with the mold has better fluidity and micro-expansion performance, and the bonding strength with concrete and the bonding performance with RPC grouting pipes can be significantly improved.

Description

technical field [0001] The invention belongs to the technical field of molded grouting materials for tunnel lining vaults, and in particular relates to a micro-expansion grouting material for tunnel lining vaults molded grouting and a preparation method thereof. Background technique [0002] Tunneling is an important part of road construction. For the opened or newly built tunnels, due to the defects of the lining vault concrete construction technology itself, the quality of the construction personnel and the construction management problems, the hollowing of the tunnel lining vault has become a common quality problem. According to the new Austrian method theory, the primary support mainly bears the surrounding rock pressure, and the secondary lining only bears part of the pressure. When the force on the initial support of the tunnel is uneven, lining remediation is required. At this time, the lining bears a large loose pressure of the surrounding rock, which will play an ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/06C04B28/04C04B111/70
CPCC04B28/04C04B28/06C04B2111/70C04B7/02C04B2103/12C04B2103/302C04B2103/465C04B2103/50C04B22/066C04B24/121C04B22/0006C04B14/06C04B24/20C04B24/12
Inventor 殷璐侯维红吴文选黎超叶显纪宪坤苑立东
Owner WUHAN YUANJIN BUILDING MATERIALS TECH CO LTD
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