STABILITY, TENSILE STRENGTH AND STIFFNESS OF ASPHALT CONCRETE UTILIZING BENGAWAN SOLO RIVER’S SAND
The demand of road pavement infrastructure and the material used is climbing up as an effect of the increase of traffic volume, therefore, alternative of pavement material used in road pavement, such as aggregate from local material is an inevitable essential needed, as en effort of environmental awareness. The aim of this research is to investigate structural performance of asphalt mixture, which are stability, tensile strength and stiffness of Asphalt Concrete Binder Course containing Bengawan Solo River’s fine aggregate as a substitute fine aggregate of Clereng’s fine aggregate. Research was conducted in three steps, which are determination of physical properties of the material used, finding optimum bitumen content for each variation of substitute fine aggregate, and investigation on Marshall stability, tensile strength and stiffness of the mixture at optimum bitumen content. The results showed that in general the Bengawan Solo River’s fine aggregate can be used an alternative of fine agregate in the Asphalt Concrete Binder Course mixture at certain amount. However it has a lower quality than that with of fine aggregate from Clereng. This wass shown on the test results of Marshall stability, Index of Retained Strength, and Indirect Tensile Strength, as well as their stiffness. It was shown from Marshall test that the greater substitute precentage of fine aggregate from Clereng’s fine aggregate to Bengawan Solo River’s fine aggregate, the lower stability, Index of Retained Strength and Indirect Tensile Strength as well as the stiffness of the asphalt mixtures. The increasing of Bengawan Solo River’s fine aggregate proportion on the Asphalt Concrete Binder Course (ACBC) mixture led in the decreasing of Index of Retained Strength and Indirect Tensile Strength.