Improving the properties of asphalt mixture using fiber materials

Abstract

Abstract In Iraq, the increasing in number of vehicles and trucks with their heavy traffic loading under high temperature can led to different types of failures in pavements. Various types of fibbers in asphalt mixtures have been used to improve the paving properties to resist the developed distresses form the applied stresses. The main objective of this research is to find the effect of using two types of fibbers (Steel Fiber and Polypropylene Fiber) on the performance of asphalt mixture grade (40-50) from Al-Daurah refinery. In this work, four percentages of steel fibber and Polypropylene Fiber are used as combinations which are (0.4-0, 0.3-0.1, 0.2-0.2, 0.1-0.3 and 0-0.4) % by total weight of asphalt mixture. Three types of tests are carried out (stability, indirect tensile strength and flow tests) to investigate the influence of using the fibbers on hot mix asphalt. The tests are conducted in two different temperatures (40 and 60). The results show that using the combination of 0.3 steel fibber and 0.1 of Polypropylene fibber can improve the stability and flow by 34.9% and 67.7% respectively at temperature of 40c. In addition, the result shows that using the combination of 0.3 steel fibber and 0.1 of Polypropylene fibber can reduced temperature susceptibility. Finally, the use of double fibbers does not improve the stability and flow at 60c.