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This paper aims to quantify the effect of modified mixture volumetrics and compaction effort on surface characteristics of asphalt pavements. Specimens were prepared using PG 64-10 asphalt binder mixed with crushed limestone aggregate. Three types of asphalt modifiers were added; Crumb Tire Rubber (CTR), Microcrystalline Synthetic Wax (MSW) and Nano Silica (NS). In addition, specimens were adjusted at 4% air void and were compacted at Design Number of Gyrations (Ndes) = 119 and 82 to simulate high and low levels of trac, respectively. Research findings revealed that Air Voids Volume (V a ) and Effective Binder Volume (V be ) exert a significant effect on the surface frictional properties. Additionally, the ratio of V a  to V be , expressed as P v , was also investigated to study the combined effect of V a  and V be  on surface friction results. It was concluded that P v  has a considerable role in the evaluation process. It was also shown that increasing the level of compaction would result in a positive effect on British Pendulum Number (BPN) measurements and the opposite is true in terms of macrotexture measurements. Furthermore, CTR-modified mixtures exhibited the highest values of friction and macrotexture followed by NS-modified mixtures. MSW-modified and unmodified mixtures exhibited the least fractional characteristics.

Quantifying the effect of modified mixture volumetrics and compaction effort on skid resistance of asphalt pavements