theapplication of recycledaggregates of construction debris inasphalt concretemix design

the purpose of this research was to evaluate the application of recycled aggregates of constructiondebris such as concrete, cement block and rubbles from pars-kangan site in asphalt concrete mix design. toevaluate the performance of aggregates different mix designs with recycled aggregate percentages of 0, 10,30, 50 and bitumen percentages of 4, 4.5, 5, 5.5, 6, and 6.5 were provided and two marshall specimens (totally48 specimens) prepared for each mix design. marshall test was conducted on the specimens to evaluate theirphysical and mechanical properties. the test results indicated that the increase of recycled aggregatespercentage in asphalt concrete mix design leads to lower strength in marshall specimens. hence, in the nextround of research the same asphalt concrete mix designs with bitumen-sulfur proportion of 60-40 wereprovided in order to increase the strength of aggregates. the marshall physical and mechanical test resultsspecified that sulfur has a significant role in increasing the strength of specimens. but increasing therecycled aggregates resulted in decrease of strength. by comparing the test results, it was inferable that sulfurdoesn’t have a significant role in increasing the technical specifications of aggregates, and it only increases thestrength of specimens.