Shotcrete rebound rate testing method

A technology of sprayed concrete and rebound rate, which is applied in the test of shotcrete rebound rate test and the test field of rebound rate test of shotcrete support concrete in tunnel engineering, which can solve the problems of non-standard test methods and no clear test methods

Inactive Publication Date: 2017-06-09
WATER CONSERVANCY & HYDROPOWER SCI RES INST OF LIAONING PROVINCE
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AI Technical Summary

Problems solved by technology

[0003] In the current rebound rate test, there is no clear test method or the test method is not standardized

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0020] A method of shotcrete rebound rate test:

[0021] 1. Lay non-absorbent canvas on the ground of the spray support surface, the edge of the laying surface should be 30mm larger than the spray support surface, and weigh the mass of the canvas in m 0 , accurate to 0.1kg.

[0022] 2. Test the density ρ of shotcrete and count the volume V of shotcrete used for the shotcrete support surface.

[0023] 3. After the spraying operation is completed, weigh the mass m of the sprayed concrete and canvas that fell to the ground 1 .

[0024] 4. Resilience test results X 回 Calculate according to the formula, accurate to 0.1%.

[0025]

[0026] Where: X 回 — Rebound rate of shotcrete, %.

[0027] m 0 - the mass of the canvas in kilograms (kg).

[0028] m 1 —The mass of the shotcrete and canvas on the ground, in kilograms (kg).

[0029] ρ—the density of shotcrete, in kilograms per cubic meter (kg / m 3 ).

[0030] V—the use volume V of shotcrete, in cubic meters (m 3 ).

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Abstract

A shotcrete rebound rate testing method includes: laying water-nonabsorbent carrying cloth on the ground of a shot supporting face, and weighing mass m0 of the carrying cloth; testing density Rho of shotcrete, and recording volume V of the shotcrete used by the shot supporting face; after shot operation is completed, weighing m1 of the shotcrete falling on the ground and the carrying cloth; calculating a rebound rate testing result X according to a following formula. The method can reflect rebound rate of the shotcrete more accurately and is standard.

Description

technical field [0001] The invention mainly relates to the field of concrete shotcrete anchor support engineering, and is a method for testing the rebound rate of sprayed concrete, and is particularly suitable for the test of the rebound rate of shotcrete support concrete in tunnel engineering. Background technique [0002] Shotcrete is widely used in shotcrete anchor support engineering, and the rebound rate of shotcrete is an important economic index. The economic benefits of shotcrete are reflected by testing the rebound rate of shotcrete, and at the same time, the appropriate concrete mix ratio and construction technology are controlled to achieve the purpose of saving concrete raw materials and improving economic benefits. [0003] In the current rebound rate test, there is no clear test method or the test method is not standardized. Contents of the invention [0004] The purpose of the present invention is to provide a method for testing the rebound rate of shotcret...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N5/00
CPCG01N5/00
Inventor 汪魁峰夏海江宗兆博宋立元艾新春李远徐志林刘大为邵大明谢楠杨晓男杨雪刘波王兴华杨春旗黄为汤彦明
Owner WATER CONSERVANCY & HYDROPOWER SCI RES INST OF LIAONING PROVINCE
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