Table 4: Average surface roughness.

Nanosilica Percentage (%)	Average Surface Roughness
	Unaged	RTFO aged	PAV aged
0	4.191	2.505	0.004
1	4.457	3.204	4.069
2	6.249	3.246	5.062
3	4.342	2.712	2.631
4	5.039	2.152	4.227
5	5.736	0.002	3.164
	Average	5.002	2.764	3.831