Evaluation and Performance of Fly Ash in Porous Asphalt by Using Two Sources of Asphalt Binder

Porous asphalts are laterally followed in different applications especially in parking area, light road traffic, walkways, etc. The study of its properties is necessary due to stability and durability. The objective of this study is to evaluate various approaches to improve the durability and strength of the porous asphalt through laboratory testing. Porous asphalt specimens were prepared using two types of binder's sources: Lanaz refinery from Erbil city symbolled (A) and Phonix refinery from Slemani city symbolled (B) have penetration grade 40-50. Fly ash was utilized in the porous asphalt as an alternative admixture to replace filler (limestone powder) used in dry process. Mixtures forms of 4, 6, and 8% of flyash replacement. Laboratory tests, including permeability test, Marshall Stability and flow test, volumetric of Marshall, and low temperature cracking test, were conducted. It is found that replacing 6% of fly ash significantly improved the overall performance of the porous asphalt mixtures. Fly ash improves stability and durability of the mixture more than limestone powder (filler)