ASSESSING THE INFLUENCE OF AGING ON ASPHALT CONCRETE PROPERTIES

Aging is one of the real issues service life of pavement. The change after a period of time service life and when exposed to the this study local materials including asphalt cement, Portland cement and silica fume were used as mineral filler. Two types of specimens were prepared and tested mineral filler and the second fume as mineral filler. The optimum asphalt content of mixture to Marshall Design method. Optimum asphalt c specimens that contain 100 % Portland cement as mineral filler and it was 5.1 % for specimens that contain 50 % Portland cement and 50 % silica fume as mineral filler Fifty one (51) of asphalt concrete specimens (Marshall Spe For the purpose of studying the effect of short term aging, part of specimens was placed in the oven and subjected it to a temperature of 135 ºC for (2 and 4 hr), while for the long term aging, another part of specimens was placed in subjected it to a temperature of 85 ºC for 72 hr (3 days) and 120 hr (5 days) according to AASHTO R30. The results of Marshall Test showed that the stability was increased by 13.63%, 27.27%, 51, 81 and 63.63% after after L.T.A(3 and 5) days, respectively. Flow and 4) hr and after L.T.A ( respectively. Also, the results showed that the air voids in total mixture were after short and long term aging. Generally, the results showed that the use of 50% silica fume as a mineral filler with 50 %Portland cement leads to of aging on properties of Marshall by different percentages