Experimental Investigation of the Coarse Aggregate Angularity Effect on Mechanical Performance of HMA

The variation of the coarse aggregate angularity (CAA) can influence the interlocking of the stone particles and consequently have an important effect on the shear strength, stiffness and asphalt-aggregate interaction. The present study related the coarse aggregate angularity to the laboratory fatigue and creep performance of asphalt pavements. Asphalt mixtures with different levels of crushed gravel were evaluated through static and dynamic loading tests. Coarse aggregate properties were characterized through fracture surface counts, direct shear and resilient modulus tests. The results of this research indicated that coarse aggregate properties, mainly CAA have significant effect on mechanical properties of HMA.

Keywords:

Asphalt pavements , coarse aggregate angularity , mechanical properties , fatigue life , creep compliance