Abstract

Scrap tires and plastics are among the main solidwastes generated in large amount throughout the world.Polyethylene Terephthalate (PET) is the most consumed andwasted plastic. In this study the effects of PET particles size andcontent on some engineering properties of asphalt concretecontaining rubber modified asphalt has been investigated.Different concentrations of waste PET including, 0, 2, 4, 6, 8 and10% (by the weight of binder) in two different ranges of sizewere to asphalt concrete and the Marshall stability, Marshallquotient, indirect tensile strength (ITS) and uniaxial dynamiccreep properties were evaluated. Results show that the Marshallstability and Marshall quotient increase with increasing PETcontent. The indirect tensile strength (ITS) test results show thatthe highest ITS is obtained by adding 2% of PET into themixtures and beyond that the ITS decreases with increasingPET content. Dynamic creep test results revealed that theresistance against permanent deformation decreases withincreasing PET content. However, the mixture containing finegraded PET particles has more resistance against permanentdeformation than the mixture containing coarse graded PETparticles. Comparing the results on the rubber modifiedmixtures in this research with those on conventional mixturesaccomplished previously reveals that the trend is different.