Application of Polypropylene Fiber on the Rutting and Tensile Strength of Binder Layer of Flexible Pavement Based on Complex Procedure

Improving the properties of asphalt mixtures has been one of the most vital issues in pavement engineering. One of the most important additives in improving asphalt condition is Polypropylene Fiber. This additive is used in civil engineering and pavement engineering in order to enhancing the physical and mechanical properties of asphalt mixtures. In this research by adding 0.1 to 0.5 contents of polypropylene fiber to asphalt specimen of binder grading based on complex procedure and performing Indirect Tensile Test, Resilient Modulus test and Dynamical Creep test and data analyzing, observed that increasing of this modifier leads to decreasing the dry tensile strength, wet tensile strength, Resilient Modulus and Flow number. Results showed that polypropylene fiber weakens of asphalt against moisture and decreases the rutting potential of asphalt specimen and regards to absorbing to aggregates and bitumen, it leads to weakening the cohesion of aggregates. Because of decreasing the flow number, this modifier causes less forming of asphalt mixtures, too.