Laboratory Evaluation on Performance of Fiber-Modified Asphalt Mixtures Containing High Percentage of RAP

Table 7

Bending creep property of the asphalt binder.

Asphalt type	−12°C		−18°C
	S (MPa)	m	S (MPa)	m
Matrix asphalt	60.1	0.535	268	0.412
LF-modified asphalt	64.5	0.525	295	0.375
PF-modified asphalt	98.5	0.435	349.5	0.330
BF-modified asphalt	62.5	0.532	272	0.406

For creep rates, the matrix asphalt shows the highest m value than the others at both −12°C and −18°C. The reason is that the interfacial transmission and the blocking effect caused by fibers could obstruct the creep behavior of asphalt. Overall, the ranking of the four kinds of asphalt is matrix asphalt ≈ BF-modified asphalt > LF-modified asphalt > PF-modified asphalt.