Novel flexible composite shotcrete layer support material

A concrete and flexible technology, applied in the field of new flexible composite concrete spray layer support materials, can solve problems such as affecting the strength of concrete, and achieve the effects of improving workability, improving anti-seepage performance, and reducing rebound rate

Active Publication Date: 2015-08-19
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the one hand, adding rubber powder to concrete makes it possible to toughen concrete and resist earthquakes, but adding too much rubber powder will affect the strength and other related properties of concrete

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A new type of flexible composite concrete sprayed layer support material, 80 parts of cement, 80 parts of sand, 100 parts of stone, 60 parts of rubber particles, 40 parts of fly ash, 20 parts of end-hook steel fiber, 50 parts of water, and crosslinking agent 6 parts, 5 parts of admixture, 4 parts of polyamic acid resin with a solid content of 15%, and 3 parts of silane coupling agent solution with a concentration of 1% were uniformly mixed and stirred at room temperature.

[0025] The cement is ordinary Portland cement P.O42.5.

[0026] The sand is Zhonghe sand with a fineness modulus of 2.5-3.0, and the average particle size is 0.50mm; the stone meets the gradation of the uneven coefficient Cu>5, the curvature coefficient 1

[0027] The rubber particles are surface-modified rubber particles with a particle diameter of 2mm.

[0028] The rubber interface modifier of the surface-modified rubber particle...

Embodiment 2

[0036] A new type of flexible composite concrete sprayed layer support material, 90 parts of cement, 90 parts of sand, 110 parts of stone, 70 parts of rubber particles, 50 parts of fly ash, 25 parts of end-hook steel fiber, 60 parts of water, and crosslinking agent 6 parts, 6 parts of admixture, 5 parts of polyamic acid resin with a solid content of 15%, and 4 parts of silane coupling agent solution with a concentration of 1% were uniformly mixed and stirred at room temperature.

[0037] The cement is ordinary Portland cement P.O42.5.

[0038] The sand is medium-river sand with a fineness modulus of 2.5-3.0, and the average particle size is 0.40mm; the stone meets the gradation conditions of unevenness coefficient Cu>5, curvature coefficient 1

[0039] The rubber particles are surface-modified rubber particles with a particle diameter of 2mm.

[0040] The rubber interface modifier of the surface-modified rub...

Embodiment 3

[0048] A new type of flexible composite concrete sprayed layer support material, 180 parts of cement, 200 parts of sand, 220 parts of stone, 150 parts of rubber particles, 100 parts of fly ash, 50 parts of end hook steel fiber, 140 parts of water, crosslinking agent 14 parts, 14 parts of admixture, 13 parts of polyamic acid resin with a solid content of 20%, and 8 parts of silane coupling agent solution with a concentration of 1% were uniformly mixed and stirred at room temperature.

[0049] The cement is ordinary Portland cement P.O42.5.

[0050] The sand is Zhonghe sand with a fineness modulus of 2.5-3.0, and the average particle size is 0.50mm; the stone meets the gradation of the uneven coefficient Cu>5, the curvature coefficient 1

[0051] The rubber particles are surface-modified rubber particles with a particle diameter of 3mm.

[0052] The rubber interface modifier of the surface-modified rubber part...

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PUM

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Abstract

The present invention relates to a novel flexible composite shotcrete layer support material which comprises the following components in parts by weight: 80-100 parts of cement, 80-120 parts of sands, 100-120 parts of stones, 60-100 parts of rubber particles, 40-60 parts of coal ash, 20-30 parts of hooked end steel fibers, 50-80 parts of water, 6-7 parts of a crosslinking agent, 5-8 parts of an additive, 2-10 parts of polyamic acid resin with a solid content of 10%-25% and 3-5 parts of a 1% silane coupler solution. The prepared shotcrete layer material is greatly improved in compression strength, rupture strength and flexural toughness. The novel flexible composite shotcrete layer support material can be applied to the field of support to surrounding rocks of complex rock layers with characteristics of high stress, soft rock, expansion, flowing deformation, fault structure fracture zones, mining influence and the like or other dynamic pressure tunnel as well as the field of underground engineering of tunnels, subways and the like.

Description

technical field [0001] The invention relates to the field of mining engineering and underground engineering fields such as tunnels and subways, in particular to a novel flexible composite concrete sprayed layer support material. Background technique [0002] In mining engineering or other underground engineering, the maintenance of support systems for complex rock formations or other dynamic pressure roadways with characteristics of softness, swelling, rheology, and high stress is often encountered. Shotcrete, which has been widely used in recent years, is concrete constructed by spraying. The concrete sprayed on the surface of the roadway must quickly lose its fluidity, otherwise it will fall off due to flow, so an "accelerator" must be added to the shotcrete. Therefore, the basic formula of shotcrete in China is cement, sand, gravel and accelerator. However, due to the strong alkalinity of the quick-setting agent, it seriously affects the later compressive strength and f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04C04B14/06C04B14/02C04B14/48
Inventor 李术才王琦陈江舟邵行何绍衡曹明路平奕炜于翔栾英成江贝王富奇任尧喜杜郁张琪蒋昕峄田旖旎郭宇晶郭念波张世国刘文江肖国强解洪兵王德超姜作华丁国利雷静李培靳黎明
Owner SHANDONG UNIV
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