ABSTRACT
The objective of this experimental work is to investigate the effects of warm-mix surfactant content on the conventional properties, Zero Shear Viscosity (ZSV), frequency sensitivity and temperature sensitivity of unmodified and styrene–butadiene–styrene triblock copolymer (SBS) modified asphalt. Test results indicate that the ZSV of unmodified and SBS modified asphalt decrease as the warm-mix surfactant content increases from 0 to 2.0 wt%, and the decrement of the SBS modified asphalt is greater than that of the unmodified asphalt. As the warm-mix surfactant content increases, the frequency sensitivity and temperature sensitivity of G* of the unmodified and SBS modified asphalts increases and decreases, respectively. In the conventional tests, as the warm-mix surfactant content increases, for the modified asphalt, the penetration and viscosity decrease, ductility increases, and the change of the softening point is slight; for the unmodified asphalt, the conventional properties do not change significantly.
