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
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[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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