The Effect of Filler Type and Content on Rutting Resistance of Asphaltic Materials

This research evaluates the effect of filler type and content on rutting resistance of asphaltic materials by using laboratory experiments. To examine the effect of filler type, two traditional fillers (Silica sandstone powder and Portland cement) and a new recycled lime powder (Eggshell) were considered. To investigate the effect of filler content, three different filler contents were used. Marshall Stability test was performed on full mixes in order to determine the optimum binder content of the mixtures. Then, the static creep test was performed on Fine Aggregate Matrix (FAM) samples. The permanent strain after 10 minutes of recovery (PS-660) was considered as the indicator of potential to rutting. It was shown that PS-660 has a good correlation with total strain after 60 seconds of loading (TS-60), permanent strain after 60 seconds of recovery (PS-120), the slope of the primary (θ 1 ) and secondary (θ 2 ) Phases of the creep curve, binder percent of FAM samples (B%), as well as with Marshall Quotient (MQ) value of full mixes. The test results clearly demonstrated that both filler type and content can significantly influence rutting resistance of asphaltic materials.