Abstract
As a thermosetting material, unsaturated polyester resin (UPR) can effectively improve the high-temperature stability of bitumen. However, compared with epoxy modified bitumen, UPR modified bitumen has inferior low-temperature crack resistance. Therefore, this paper used polyurethane (PU) to modify UPR, and determined the best formulation of PU/UPR modified bitumen. The properties of PU/UPR modified bituminous binder were evaluated by viscosity, tensile, DSR and BBR tests. Besides, through a series of laboratory tests, the road performances of PU/UPR modified bituminous mixture were comprehensively studied. The results indicate that the PU/UPR modified bituminous binder has better tensile strength and low-temperature performance compared with the pure UPR modified bituminous binder, but the high-temperature stability was slightly worse. After PU addition, the flexural-tensile strength and fatigue resistance of the bituminous mixture were obviously improved, and the low-temperature performance improved slightly. The water stability and oil corrosion resistance almost remained unchanged, and the high-temperature performance was slightly decreased.
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