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

Table 8

Three-stage models and boundary points for control and modified mixtures at 400 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	= 4088N^0.2949	= 469	25185.27	25074.93	= 25074.93 + 15.1 (-469)	a	a
	12R	= 3740.9N^0.2823	= 979	26216.27	26138.10	= 26138.10 + 7.977 (-979)	a	a
	12R 4.5V	= 2891.4N^0.277	= 647	17659.15	17367.15	= 17367.15 + 7.19 (-647)	a	a
50°C	Control	= 5146.9N^0.307	= 169	25046.38	24860.33	= 24860.33 + 39.439 (-169)	= 829	= 50890.1 + 2789.6()
	12R	= 4100.3N^0.2983	= 599	27859.29	27626.26	= 27626.26 + 14.184 (-599)	a	a
	12R 4.5V	= 3923.8N^0.2462	= 269	15792.31	15556.50	= 15556.5 + 14.162 (-269)	a	a

Not found at the end of 1800 load cycle.