Identifying the Thermal Storage Stability of Polymer-Modified Asphalt with Carbon Nanotubes Based on Its Macroperformance and Micromorphology

Table 4

The surface roughness of samples with different storage times.

Modifier	Storage time (days)	Top			Bottom
		Rq	Ra	Rmax	Rq	Ra	Rmax
SBS + CNTs-I	0	1.41	1.05	36.2	1.41	1.05	36.2
	2	1.76	1.36	30.8	1.27	0.993	25.6
	4	1.16	0.859	33.0	1.44	1.10	27.1
	6	1.24	0.82	35.7	1.19	0.9	19.7
	8	1.09	0.796	39.3	2.46	1.19	87.6
	10	2.24	1.28	61.1	2.11	1.16	73.4
SBS + CNTs-II	0	1.03	0.751	40.7	1.03	0.751	40.7
	2	1.21	0.904	60.6	1.37	1.04	39.2
	4	1.26	0.984	32.8	1.20	0.911	30.8
	6	1.30	1.02	19.1	1.59	1.13	35.0
	8	1.30	0.997	29.5	1.20	0.916	18.5
	10	1.28	0.96	35.3	1.07	0.818	18.0