Engineering Properties Evaluation of Polypropylene Fibers Modified Asphalt Mixtures of Topeka Aggregation Based on Complex Procedure.

Modification of the asphalt mixture is one approach used to achieve good mixtures. Fibers and polymers are generally two important modifiers in improving pavement performance, though fibers have received much attention for their enhancement effects among other modifiers for asphalt. In this research by evaluating various methods of Polypropylene fibers mixing in asphalt mixture and choosing the most suitable one, adding 0.1 to 0.5 of Polypropylene fibers contents in asphalt mixtures based on Topeka aggregation are studied. The results indicated that polypropylene has direct ratio to increasing of Marshall Stability, VTM and VMA and has reverse ratio to decreasing of Flow, VFA and Unit Weight. These results are because of fiber's resistive properties, absorption by bitumen and aggregates and also chemical reactions in the mixture. This modifier causes improvement in asphalt physical and mechanical properties based on Topeka aggregation. By considering polypropylene's applications, usage of it in highways with heavy traffic can be discussed in order to increasing pavement life. [ABSTRACT FROM AUTHOR]