siyab houshmandi khanghahi
seyed javid zakavi
Mohammad montasheri
Abstract
In hot-mix asphalt concrete, bitumen is used as the adhesive, and this material has a significant effect on the performance of mixed asphalt. In this study, Gilsonite, as a part of bitumen and modifier, has been studied in order to improve the performance of mixed asphalt. Indirect tensile tests were performed on hot-mix asphalt samples with different amounts of Gilsonite and aged for each of the samples with long-term aging, short-term aging, and non-aging. The results show an increase in tensile strength and vertical compressive stress due to increasing the amount of Gilsonite, also in long-term aging, the highest tensile strength and vertical compressive stress are obtained. In examining the results of toughness and fracture energy, aging reduces both.
Keywords
Hot-mix asphalt, Aging,
Gilsonite, Indirect tensile strength, Bitumen.
