EVALUATION OF MOISTURE DAMAGE FOR RECYCLED ASPHALT PAVEMENT MIXTURES IN TERMS OF TENSILE STRENGTH WITH AGING FACTORS

This research include studying the effect of moisture on virgin and recycled asphalt mixtures, the best gradation and design asphalt content was selected according to superpave method. Superpave Gyratory compactor (SGC) is used to compact mixtures  with (100,  and 150) mm in diameter of asphaltic specimens, the volumetric properties and mix design for binder layer are determined according to superpave design system, four different percent of (6 ,13, 19 and 25%) of RAP are used,  the design asphalt contents are (4.4% and 4.21%) for asphalt grade (40-50),(60-70)mixtures respectively for preparation mixes  to compared to virgin mixtures , where tensile strength ratio TSR is the measure of water sensitivity was  determined and the Indirect Tensile strength was calculated via ITS test to measure the resistance of mixtures containing RAP materials   to moisture  and compared to virgin mixtures .the test results indicated that addition of RAP to mixes shows  a significant  increase on resistance to moisture damage.