Influences on Shotcrete Rebound from Walls with Random Roughness

Table 5

Experimental verification of spreading coefficients.

Test no.	Surface tension (mN/m)	Viscosity (mPa.s)	Roughness (µm)	Velocity (m/s)	Spreading coefficient		RE (%)
					EV	TV
1	6.3	135	0.5	1	1.40	1.37	2%
2	6.3	97	2.5	2	2.15	2.06	4%
3	8	53	0.5	4	3.50	3.49	0.3%
4	8	135	1.5	1	1.30	1.34	3.4%
5	10.5	53	2.5	4	3.02	3.19	6.3%
6	10.5	97	1.5	2	2.21	2.07	5.9%

EV = experimental value; TV = theoretical value; RE = relative error.