Experimental and Numerical Studies on Tire Tread Block Friction Characteristics Based on a New Test Device

Table 2

Average friction coefficients.

Road type	Tread type	Average friction coefficient
		Dry	Std dev	Wet	Std dev
Coarse cement	No pattern	1.19	0.0152	1.02	0.0162
Coarse cement	RSD2 pattern	1.18	0.0148	1.01	0.0153
Coarse cement	RSD2-A pattern	1.17	0.0156
Coarse cement	RSD2-B pattern	1.31	0.0162
Smooth cement	No pattern	0.65	0.0135
Smooth cement	RSD2 pattern	0.79	0.0147
AC13 asphalt	No pattern	1.31	0.0173	1.11	0.0161
AC13 asphalt	RSD2 pattern	1.45	0.018	1.25	0.0163
SMA16 asphalt	No pattern	1.41	0.0167	1.27	0.0154
SMA16 asphalt	RSD2 pattern	1.45	0.0192	1.26	0.0173
OGFC13 asphalt	No pattern	1.22	0.0172	1.08	0.0165
OGFC13 asphalt	RSD2 pattern	1.36	0.0189	1.150	0.0158
OGFC16 asphalt	No pattern	1.06	0.0182
OGFC16 asphalt	RSD2 pattern	1.17	0.0173