Sepehr Saedi, Seref Oruc, Golnar Sadeghian Asl
Because of the gapping in their gradation and the high bitumen content, the SMA have a high potential of asphalt drain down. Using cellulosic fibers is one of the solutions for this problem. To conduct the study, 38 Marshall non-fibrous samples containing 0.3, 0.4, 0.5, 0.6 and 0.7 weight percentage mixtures of Viatop plus were designed and prepared by Marshall design method. Based on the results, use of 0.5% of fibers with an optimum asphalt content of 6.85% is the optimum amount of fiber used to prevent asphalt drain down. In addition to decreasing the drain down rate below the range determined in the relevant regulations, The Marshall quotient index experienced a maximum amount of 296.66 kg/mm and shows a growth of 22% comparing to non-fibrous samples. However, with increasing amount of fiber, in spite of decreasing asphalt drain down potential, the Marshall quotient index decreases. The percentage of stripping of the samples was estimated by boiling water test. In addition, the moisture sensitivity test was carried out by using the Latman method on samples. Boiling water test results and a significant increase in the TSR index in samples modified with fiber, show the positive effect of this fiber against moisture damage on SMA.
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