Effects of Interface Modifier on Asphalt Concrete Mixture Performance and Analysis of its Mechanism.

A comprehensive laboratory testing program, including rotary loaded wheel rutting, four-point bending fatigue, and low-temperature bending tests, was carried out in this study to evaluate a newer type of asphalt concrete mixture modifier, termed as Interface Modifier. Unlike many of the traditional asphalt binder modifiers, such as Styrene-butadiene-styrene (SBS), Styrene-butadiene Rubber Latex (SBR), Polyethylene (PE), etc., the Interface Modifier was fed directly into the mixing chamber and mixed with heated aggregate. The electron microscope scanning combined with rheology testing was also used to analyze the mechanism of interface modifier/aggregate interactions. With the use of the Interface Modifier, improved bonding between the asphalt binder and the aggregates were observed. Test results show that the use of the Interface Modifier in the asphalt concrete mix could improve its resistance to rutting at high temperature and water stability, as well as increase its fatigue life significantly. [ABSTRACT FROM AUTHOR]