Sprayed concrete springback inhibition method based on full-process control

A shotcrete and rebound suppression technology, which is used in earth-moving drilling, sustainable waste treatment, solid waste management, etc. Effect

Active Publication Date: 2022-05-27
RAILWAY ENG RES INST CHINA ACADEMY OF RAILWAY SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most of the existing studies are regulated from the perspective of using key functional materials, and only consider the problem of reducing the rebound rate of shotcrete from a single angle and a single factor, and fail to comprehensively consider various factors that affect the rebound during shotcrete construction. , the effect is not ideal

Method used

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  • Sprayed concrete springback inhibition method based on full-process control
  • Sprayed concrete springback inhibition method based on full-process control
  • Sprayed concrete springback inhibition method based on full-process control

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0126] The shotcrete mix ratio is controlled by the following parameters: the amount of cementitious material is 500kg / m 3 , the water-binder ratio is 0.35, the sand rate is 60%, the slump is 200mm, the plastic viscosity is 300Pa·s, and the yield stress is 200Pa; the technological parameters during spraying construction are: spraying angle 90°, spraying wind pressure 0.8MPa , the spraying distance is 1.5m, and the dosage of alkali-free accelerator is 6%; the rebound-inhibiting material used is prepared according to the following mass parts, component A: component B: component C: water=20:60:100: 820.

Embodiment 2-1

[0128] The shotcrete mix ratio is controlled by the following parameters: the amount of cementitious material is 420kg / m 3 , the water-binder ratio is 0.35, the sand rate is 60%, the slump is 200mm, the plastic viscosity is 300Pa·s, and the yield stress is 200Pa; the technological parameters during spraying construction are: spraying angle 90°, spraying wind pressure 0.8MPa , the spraying distance is 1.5m, and the dosage of alkali-free accelerator is 6%; the rebound-inhibiting material used is prepared according to the following mass parts, component A: component B: component C: water=20:60:100: 820.

Embodiment 2-2

[0130] The shotcrete mix ratio is controlled by the following parameters: the amount of cementitious material is 590kg / m 3 , the water-binder ratio is 0.35, the sand rate is 60%, the slump is 200mm, the plastic viscosity is 300Pa·s, and the yield stress is 200Pa; the technological parameters during spraying construction are: spraying angle 90°, spraying wind pressure 0.8MPa , the spraying distance is 1.5m, and the dosage of alkali-free accelerator is 6%; the rebound-inhibiting material used is prepared according to the following mass parts, component A: component B: component C: water=20:60:100: 820.

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Abstract

The invention relates to a shotcrete springback inhibition method based on full-process control, which comprises the following steps: determining a shotcrete mix proportion design parameter, and establishing a shotcrete mix proportion design parameter control system; determining a springback inhibition key material of the sprayed concrete, and adding the springback inhibition key material into the concrete mix proportion to obtain low-springback sprayed concrete; and key process parameters of spraying construction are determined, a key process parameter control system of spraying construction is established, and low-resilience sprayed concrete is adopted for spraying construction. The invention provides the full-process sprayed concrete springback control method which covers a mix proportion control system, a springback inhibition key material and a jet flow forming key process control system, by means of the method, the springback rate of sprayed concrete construction can be effectively reduced, and the springback rate of wet sprayed concrete construction is smaller than or equal to 10%. The method can be used for the concrete spraying construction process of railway and highway tunnels, and is wide in application and worthy of popularization.

Description

technical field [0001] The invention relates to the field of building materials, in particular to a rebound suppression method for shotcrete based on full process control. Background technique [0002] Shotcrete is a kind of special concrete formed by jet flow. Since it does not need to use formwork during the forming process, it is widely used in tunnel primary support, slope protection, and underground engineering. However, compared with the traditional vibration molding, the injection molding process is a unique molding method in which the components in the concrete are blown away by high-speed airflow and transported to the sprayed surface by pneumatic force. This process will cause the aggregate and part of the concrete to After the slurry reaches the surface to be sprayed, it cannot be firmly in contact with the slurry and rebounds, which not only causes waste of raw materials, but also affects the construction progress. With the continuous improvement of concrete spr...

Claims

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Application Information

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IPC IPC(8): C04B24/38E21D11/10C04B28/00
CPCC04B40/0039E21D11/10C04B28/00C04B2201/10C04B2111/00155C04B24/122C04B22/147C04B24/24C04B14/06Y02W30/91
Inventor 王家赫王嘉旋谢永江仲新华渠亚男苏婉玉李连吉孔庆欣
Owner RAILWAY ENG RES INST CHINA ACADEMY OF RAILWAY SCI
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