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Mining sprayed concrete and method for preparing same

A shotcrete and mining technology, applied in the field of mine shotcrete, can solve problems such as the ratio not meeting the requirements, cracking, etc., and achieve the effect of effectively controlling the rebound rate and increasing the internal stress.

Inactive Publication Date: 2017-12-29
美亚高新材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can solve problems such as cracking, dust, springback, and the ratio cannot meet the requirements, and improve the working environment of coal miners

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A mine shotcrete, comprising the following components in weight percentage:

[0024] Ordinary silicon 42.5 cement 30%, medium coarse sand 25%, gravel 41%, polypropylene fiber 0.5%, styrene-acrylic redispersible rubber powder 0.4%, aluminum sulfate 2.6%, sodium silicate 0.5%.

[0025] The preparation method of a kind of shotcrete for mining in this embodiment is as follows: dry the medium-coarse sand and crushed stone, fully stir and mix them with other remaining materials, and pack them in moisture-proof bags. The prepared material is applied in the construction of coal mine underground roadway, using a water-material ratio of 0.4:1, the 1d compressive strength is ≥7MPa, the 3d compressive strength is ≥30MPa, and the rebound rate is less than 12%.

Embodiment 2

[0027] A mine shotcrete, comprising the following components in weight percentage:

[0028] 28% ordinary silicon 42.5 cement, 25% medium coarse sand, 41% crushed stone, 0.5% polypropylene fiber, 0.4% styrene-acrylic redispersible rubber powder, 2.6% aluminum sulfate, 0.5% sodium silicate, 2% silicon oxide crystal kind.

[0029] Wherein the silicon oxide seed crystal is prepared by the following method:

[0030] In the seed crystal tank, add a water glass solution with a mass percentage concentration of 8.5% in terms of SiO2, and then dropwise add a 0.5N hydrochloric acid solution to a pH value of 7.5. After the complete reaction, the seed crystals are aged for 15 hours and then filtered and washed. After drying in a constant temperature vacuum drying oven for 3.5 hours, it is sealed and stored, wherein the drying temperature is 60-65°C.

[0031] The preparation method of a kind of shotcrete for mining in this embodiment is as follows: dry the medium-coarse sand and crushed s...

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Abstract

The invention provides mining sprayed concrete and a method for preparing the same. Materials for the mining sprayed concrete can be constructed by the aid of the traditional dry spraying machines. The materials comprise cement, sand, crushed stone, polypropylene fibers, styrene-acrylic redispersible adhesive powder, aluminum sulfate, sodium silicate and the like. The mining sprayed concrete and the method have the advantages that the mining sprayed concrete which is a finished product is produced in factories and can be used after water is added into the mining sprayed concrete on sites, accelerators can be omitted on the sites, and the problems of great ratio fluctuation and instable quality due to site preparation can be solved; the materials contain the polypropylene fibers and the styrene-acrylic redispersible adhesive powder, and accordingly the shortcomings of high rebound rate of the traditional sprayed concrete and cracking after the traditional sprayed concrete is solidified can be overcome; the aluminum sulfate and the sodium silicate are used in a combined manner, accordingly, whitewashing materials can be assuredly initially set in 5 minutes and finally set in 8 minutes, and the sprayed concrete construction standard requirements on setting time indexes can be met.

Description

technical field [0001] The invention relates to mine shotcrete, in particular to a mine shotcrete and a preparation method thereof. Background technique [0002] The domestic coal mines use shotcrete as materials that are basically mixed with cement, sandstone, fly ash and quick-setting agent in a certain proportion, and are sprayed with a dry shotcrete machine. With the improvement of coal mining level, the problems of dry spraying technology are mainly reflected in the following points: [0003] (1) The sprayed coating cracks. As the downhole pressure increases, under the action of dynamic pressure (or impact pressure), the sprayed coating lacking toughness often cracks, bursts or falls off in one piece (during dynamic pressure The cracking degree of the sprayed concrete in the heavily affected area is as high as 50%), seriously affecting the support effect, and even causing major accidents such as casualties and facility damage. [0004] (2) Delamination of the sprayed ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04
Inventor 王雪礼朱宗君
Owner 美亚高新材料股份有限公司
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