EVALUATION OF THE EFFECT OF AGGREGATES ANGULARITY ON THE SURFACE PROPERTIES OF HOT MIX ASPHALT
Last modified: 2017-02-28
Abstract
This paper describes the evaluation of the angularity characteristics of the aggregates crushed with different types of crushers, and their impact on the surface properties of the pavements such as texture and surface friction. For this purpose, limestone aggregates were prepared using impact, jaw, and roll crushers. Following the determination of the angularity characteristics of the aggregate using ASTM C1252 involving two different test methods (Methods A and B) and the EN 933-6, the asphalt slabs (65x65 cm) have been prepared and compacted at their optimum bitumen contents. Texture properties of the slabs have been studied using sand patch method and laser scanner. The frictional properties have been also determined by means of Dynamic Friction Tester (DFT). Finally, evaluations have been made to determine the relationship of aggregate angularity and the surface properties.