TheApplication of RecycledAggregates of Construction Debris inAsphalt ConcreteMix Design

Abstract

The purpose of this research was to evaluate the application of recycled aggregates of construction<br />debris such as concrete, cement block and rubbles from Pars-Kangan site in asphalt concrete mix design. To<br />evaluate the performance of aggregates different mix designs with recycled aggregate percentages of 0, 10,<br />30, 50 and bitumen percentages of 4, 4.5, 5, 5.5, 6, and 6.5 were provided and two Marshall specimens (Totally<br />48 specimens) prepared for each mix design. Marshall test was conducted on the specimens to evaluate their<br />physical and mechanical properties. The test results indicated that the increase of recycled aggregates<br />percentage in asphalt concrete mix design leads to lower strength in Marshall specimens. Hence, in the next<br />round of research the same asphalt concrete mix designs with bitumen-sulfur proportion of 60-40 were<br />provided in order to increase the strength of aggregates. The Marshall physical and mechanical test results<br />specified that sulfur has a significant role in increasing the strength of specimens. But increasing the<br />recycled aggregates resulted in decrease of strength. By comparing the test results, it was inferable that sulfur<br />doesn't have a significant role in increasing the technical specifications of aggregates, and it only increases the<br />strength of specimens.