Improved anchor rod mortar for high-ground-temperature tunnel support and preparation method of improved anchor rod mortar

A technology of high ground temperature and tunnel, applied in the direction of bolt installation, mining equipment, earthwork drilling, etc., can solve the problems of increasing construction cost, complicated operation process, not paying attention to the mechanical properties of mortar, etc., and achieve good construction performance and comprehensive performance. , the effect of enhancing mechanical properties

Inactive Publication Date: 2017-02-22
CHENGDU UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are few inventions related to construction materials that have been exposed to high temperatures for a long time, such as: a new type of mortar (application number 201310337813.5). Mechanical properties, its ratio can not make it a bolt mortar
And a high-temperature-resistant concrete and its preparation method (application number 201410125101.1). Even if the aggregate is removed from this patent to make it a high-temperature-resistant mortar, numerous additives will only bring more complicated operation process to the construction site, virtually increased construction costs

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The improved anchor bolt mortar used for high ground temperature tunnel support includes the following raw materials in parts by weight: 680 cement, 200 grade I fly ash, 450 water, 450 urban sludge pottery sand, 7 calcium carbonate whiskers, and 130 jute fiber .

[0027] The improved anchor bolt mortar preparation method for high ground temperature tunnel support includes the following steps:

[0028] (1) First add half of the water and all the light aggregate into the mixer and stir evenly, then continue stirring for 2 minutes;

[0029] (2) Then add gel material and cement and continue to stir for 2 minutes;

[0030] (3) Finally, add the remaining water, additives and jute fiber and stir evenly, then continue to stir for 3 minutes to discharge;

[0031] (4) Inject the prepared mortar into the hydraulic pumping machine for pumping, and the finished mortar must be used up within 30 minutes each time.

Embodiment 2

[0033] The improved anchor bolt mortar used for high ground temperature tunnel support includes the following raw materials in parts by weight: 730 cement, 180 grade I fly ash, 500 water, 500 urban sludge pottery sand, 10 calcium carbonate whiskers, and 130 jute fiber .

[0034] The preparation method of the improved bolt mortar used for high ground temperature tunnel support is the same as in Example 1.

Embodiment 3

[0036] The improved anchor bolt mortar used for high ground temperature tunnel support includes the following raw materials in parts by weight: 700 cement, 150 grade I fly ash, 480 water, 480 urban sludge pottery sand, 10 calcium carbonate whiskers, and 130 jute fiber .

[0037] The preparation method of the improved bolt mortar used for high ground temperature tunnel support is the same as in Example 1.

[0038] The required raw materials were mixed and poured into a 50*100 cylindrical mold for a pull-out test after 28 days of curing. The test results show that the improved mortar can withstand a high temperature of 120°C. When the ultimate pull-out force is reached, the displacement between the mortar and the steel bar is less than Ordinary anchor bolt mortar, the mortar shows less cracks, and there is no obvious difference in performance between normal temperature and 120 ℃ high temperature. At the same time, a 50*100 cylinder is used for the normal temperature compression...

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Abstract

The invention relates to the technical field of underground engineering materials, in particular to improved anchor rod mortar for a high-ground-temperature tunnel support. The improved anchor rod mortar is prepared from 680-730 parts of cement, 150-200 parts of a gel material, 450-500 parts of water, 450-500 parts of lightweight aggregates, 5-10 parts of an additive and 130 parts of jute fiber. The anchor rod mortar provided by the invention is capable of effectively improving the high temperature resistance of the mortar, and effectively reducing the stress relaxation of an anchor rod so as to form effective supporting under a long-time high-temperature condition after being coagulated. The improved anchor rod mortar has the characteristics of high temperature resistance, high tenacity, high anti-compression, anti-pull and anti-bending capabilities and the like. Furthermore, the mortar is favorable in proportion and workability and has less possibility of blocking a pipe during a pumping process, the anchor rod injection efficiency is improved, blockage phenomena during mortar pumping are effectively reduced, and the mortar still has reliable performance under the long-term high-temperature condition; in addition, the improved anchor rod mortar is low in cost, and has favorable economical efficiency; municipal sludge pottery sand, calcium carbonate whiskers and the jute fiber are new green and environment-friendly materials and are free from toxicity and pollution, so that the adverse influence caused by construction material pollution is reduced to a great extent.

Description

technical field [0001] The invention belongs to the technical field of underground engineering materials, and in particular relates to an improved bolt mortar used for supporting high ground temperature tunnels. Background technique [0002] With the rapid development of China, various transportation constructions are in full swing. The length and buried depth of various road and railway tunnels are breaking records every year. The construction environment is becoming more and more complicated. Hazards, but also consider the impact of high and low temperature. Although such problems have attracted attention and some solutions have been proposed, generally speaking, no strong targeted measures have been taken. There are a large number of waterproof and high-temperature resistant materials in highway engineering, but they are all short-term. How to achieve long-term high-temperature resistance and reduce the impact of high-temperature environments on tunnel support performanc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/00
CPCC04B28/00C04B2201/50E21D20/021C04B18/08C04B18/027C04B14/383C04B18/248
Inventor 陈国庆刘顶王伟李天斌孙晨
Owner CHENGDU UNIVERSITY OF TECHNOLOGY
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