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Basalt-fiber shotcrete for thermal-damage tunnel construction

A technology of shotcrete and basalt fiber, which is applied in the field of new shotcrete, can solve the problems of debonding and cracking, loss of bond strength, increase of rebound of shotcrete, etc., and achieve good work performance, splitting strength and bond strength Improve and improve the effect of high brittleness of concrete

Inactive Publication Date: 2017-10-03
汪耀
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Problems solved by technology

[0004] Under the environment of heat damage, the performance of ordinary shotcrete deteriorates seriously, manifested as: high brittleness, easy cracking, serious loss of bond strength, even debonding and cracking, and the supporting effect on surrounding rock is basically invalid
[0005] Under the conditions of thermal damage, the construction process parameters and physical and mechanical indexes of shotcrete are quite different from those at normal temperature. The effect of high geothermal heat and high temperature water (steam) in tunnels will lead to an increase in the rebound of shotcrete and a sharp decrease in the strength of shotcrete in the later stage. question

Method used

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  • Basalt-fiber shotcrete for thermal-damage tunnel construction
  • Basalt-fiber shotcrete for thermal-damage tunnel construction

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Embodiment Construction

[0018] Through the design of the mix ratio, quantitatively weigh a certain quality of cement, water, sand, stones, accelerator, basalt fiber and fly ash. Basalt fiber shotcrete is calculated per cubic meter, and the mix ratio is cement: water: sand: stone: quick-setting agent = 440: 198: 950: 810: 22 (unit: kg), wherein 6.05 kg of basalt fiber and 242 kg fly ash (that is, mixed with 0.25% basalt fiber and 10% fly ash).

[0019] The weighed cement, sand and stones are mixed in the mixer, and basalt fiber and fly ash are added from time to time. After being stirred by the mixer for a certain period of time, water and accelerator designed according to the mix ratio are added, and the mixing is continued. The cement, sand and basalt fibers are evenly mixed to make the prepared shotcrete more scientific and reasonable.

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Abstract

The invention relates to a new type of shotcrete, that is, basalt fiber shotcrete, in which a certain amount of basalt fiber and fly ash are added on the basis of the original shotcrete, and is especially suitable for the construction of thermal damage tunnels. Make full use of the advantages of basalt fiber and concrete, improve the splitting strength and bonding strength of shotcrete, and realize the composite material design concept of "superimposition of performance and economic effect".

Description

technical field [0001] The invention relates to a new type of shotcrete, that is, the shotcrete mixed with basalt fiber, and a certain amount of basalt fiber and fly ash are added to the original shotcrete, which is especially suitable for the construction of thermally damaged tunnels. Make full use of the advantages of basalt fiber and concrete, improve the splitting strength and bonding strength of shotcrete, and realize the composite material design concept of "superimposition of performance and economic effect". Background technique [0002] The existing technology is: ordinary sprayed concrete [0003] The same technical features: generally no formwork is used during construction, and the concrete is sprayed and poured with a pressure spray gun. The concrete can be closely bonded to the construction surface to form a complete and stable lining layer. It has the advantages of simple construction, fast strength growth, and good compactness ( adaptable). [0004] Under t...

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Application Information

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IPC IPC(8): C04B28/00C04B14/46
CPCC04B28/00C04B14/46C04B2111/00724C04B2201/50
Inventor 汪耀高翔戴兵强汤印周平
Owner 汪耀
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