A high-strength low-rebound shotcrete and its construction technology

A technology of sprayed concrete and low resilience, which is applied in the processing of building materials, construction, building construction, etc., can solve the problems of unspecified spraying technology, unspecified strength, and unfavorable durability of concrete, so as to save costs Formwork removal process, good applicability and economy, and the effect of inhibiting alkali-aggregate reaction

Active Publication Date: 2020-07-17
CHINA ACAD OF BUILDING RES +2
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Disadvantages of the above-mentioned technical solutions: the actual strength of shotcrete is still low, only reaching 30-45MPa, strictly speaking, it is not high-strength shotcrete; Detrimental to concrete durability; not regulated for spraying techniques, high rebound rate
[0008] Disadvantages of the above-mentioned technical solution: no specific strength value is given, and the characteristics of early strength and high strength are not clear; the 3D strength reaches more than 90% of the design strength, and the early strength develops too fast, which will affect the later concrete strength, and the heat of hydration will inevitably increased, limiting the scope of application

Method used

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  • A high-strength low-rebound shotcrete and its construction technology

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] The formula of high-strength low-rebound shotcrete is as follows:

[0067] 367 kg of cement P·O4 2.5 grade, 74 kg of silica fume, 50 kg of grade I zeolite rock powder, 1240 kg of sand with an average particle size of 4.75 mm, 620 kg of crushed stone with an average particle size of 10 mm, and quick-setting aluminum sulfate alkali-free liquid 30 kilograms of agent, 8 kilograms of polycarboxylate high-performance water reducing agent, mix above-mentioned raw material evenly, get finished material L 1 .

[0068] The construction technology of high-strength and low-rebound shotcrete is as follows:

[0069] (1) Prepare high-strength and low-rebound shotcrete:

[0070] The water-cement ratio (referring to the ratio of the water consumption per cubic meter of concrete to the amount of all cementitious materials) is 0.34. Considering the rebound rate, the sand rate (sand rate SP=the amount of sand S / (the amount of sand S+the amount of stones G) ×100%; the mass of sand in the...

Embodiment 2

[0081] The formulation of high-strength shotcrete is as follows:

[0082] 367 kg of cement P·O4 2.5 grade, 74 kg of silica fume, 50 kg of grade I zeolite rock powder, 1116 kg of sand with an average particle size of 1.75 mm, 744 kg of gravel with an average particle size of 4.75 mm, 50 kg of 25 mm long steel fibers, 30 kilograms of aluminum sulfate alkali-free liquid quick-setting agent, 12 kilograms of polycarboxylate high-performance water reducer, mix the above-mentioned raw materials evenly, get the finished material L 2 .

[0083] The construction process of high-strength shotcrete is as follows:

[0084] (1) Prepare high-strength and low-rebound shotcrete: the water-binder ratio (referring to the ratio of water consumption per cubic meter of concrete to the amount of all cementitious materials) is 0.32, taking into account the rebound rate, sand rate (sand rate SP = sand The amount S / (the amount of sand S+the amount of stones G)×100%; the mass of sand in the concrete a...

Embodiment 3

[0095] The formulation of high-strength shotcrete is as follows:

[0096] 496 kg of cement P·O4 2.5 grade, 75 kg of silica fume, 50 kg of grade I zeolite rock powder, 992 kg of sand with an average particle size of 0.75 mm, 868 kg of gravel with an average particle size of 15 mm, 25 kg of 25 mm long steel fibers, sulfuric acid 20 kilograms of aluminum-based non-alkali liquid quick-setting agent, 10 kilograms of polycarboxylate high-performance water reducer, mix the above-mentioned raw materials evenly, and obtain the finished material L 3 .

[0097] The construction process of high-strength shotcrete is as follows:

[0098] (1) Prepare high-strength and low-rebound shotcrete: the water-binder ratio (referring to the ratio of water consumption per cubic meter of concrete to the amount of all cementitious materials) is 0.32, taking into account the rebound rate, sand rate (sand rate SP = sand The amount S / (the amount of sand S+the amount of stones G)×100%; it is the percentage ...

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Abstract

The invention relates to high-strength low-resilience rate shotcrete and a construction process thereof, and belongs to the technical field of building concrete. The shotcrete is prepared from the following components in percentage by weight: 15 to 20 percent of cement, 3 to 4 percent of silica fume, 2 to 3 percent of natural zeolite powder, 40 to 50 percent of sand, 25 to 35 percent of gravel, 0to 2 percent of steel fibres, 0.8 to 1.2 percent of a liquid alkali-free accelerating agent and 0.3 to 0.5 percent of a polycarboxylate high-performance water reducing agent. The shotcrete disclosed by the invention is high in strength, and does not have a strength reducing phenomenon in a later stage; moreover, the resilience rate of the shotcrete is reduced to 3 percent; and compared with the construction technology, a large number of raw materials can be saved, and green healthy and sustainable development in the industry of building materials is truly realized.

Description

technical field [0001] The invention relates to a high-strength and low-rebound shotcrete and its construction technology, which belongs to the technical field of building concrete, in particular to the technical field of high-strength shotcrete. Background technique [0002] Concrete is a multiphase mixture composed of water, aggregates, cementitious materials and admixtures. Shotcrete is the use of spraying machinery, compressed air or other power, to spray cement, sand, stones and admixtures in a certain proportion to the surface to be sprayed through the nozzle, and within a few minutes Concrete reinforcement formed by internal condensation and hardening. [0003] With the development of my country's infrastructure, the demand for high-quality shotcrete in the fields of concrete protection, repair, and tunnel single-layer lining is increasing. However, the current material formula and construction technology have not yet met the requirements. At present, the highest st...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/04E04G21/02
CPCC04B28/04C04B2111/00155C04B2201/50C04B2201/52E04G21/02C04B18/146C04B14/02C04B14/06C04B14/047C04B14/48C04B2103/302C04B2103/12
Inventor 王祖琦宋普涛王巧周永祥王旭宏吕涛夏京亮王晶高超
Owner CHINA ACAD OF BUILDING RES
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