Evaluation of Permanent Deformation of Unmodified and Rubber-Reinforced SMA Asphalt Mixtures Using Dynamic Creep Test

Table 7

Three-stage models and boundary points for control and modified mixtures at 200 kPa stress.

Test temperature	Sample	Primary stage				Secondary stage		Tertiary stage
		Model	End point	Measured strain, s	Predicted strain, s	Model	End point	Model
40°C	Control	= 2979.3^0.2628	= 1173	19100.08	19086.48	= 19086.48 + 4.422 (-1173)	a	a
	12R	= 2331.3^0.2486	= 865	12222.56	12523.92	= 12523.92 + 2.235 (-865)	a	a
	12R 4.5V	= 2169.4^0.248	= 831	11294.98	11492.13	= 11492.13 + 2.223 (-831)	a	a
50°C	Control	= 2513.8^0.3004	= 479	16116.79	16051.05	= 16051.05 + 9.904 (-479)	a	a
	12R	= 2505.7^0.2737	= 701	15183.12	15059.21	= 15059.21 + 5.886 (-701)	a	a
	12R 4.5V	= 2227.5^0.2673	= 901	13865.05	13728.26	= 13728.26 + 3.865 (-901)	a	a

Not found at the end of 1800 load cycle.