Investigating the Effects of Maximum Size of Aggregate on Rutting Potential of Stone Mastic Asphalt

Imran Hafeez, Mumtaz Ahmed Kamal, Muhammad Waseem Mirza, Ayaz Aziz


Rutting in hot climatic areas and on heavy trafficking roads is the most common form of distress that has been addressed in the past by different techniques. Stone mastic asphalt has been introduced to resist rutting, first time in the pavement construction history of Pakistan that requires indepth laboratory investigation on materials and performance parameters. The main objective of the study was to investigate the influence of maximum size on the permanent deformation characteristics of stone mastic asphalt particularly at high temperatures. Rutting potential of four stone mastic asphalt concrete mixtures prepared with four nominal maximum sizes of aggregates i.e. 9.5 mm, 12 mm, 19 mm & 25.4 mm and tested using Wheel Tracker at 25, 40 and 60oC has been investigated. A regression model has also been proposed that relates rut depth with number of load cycles, temperature and maximum size of the aggregates. The study reveals that the rutting susceptibility of stone mastic asphalt for any number of loading passes is a function of the maximum size of the aggregate and the test temperature. It was further revealed that rutting increases with an increase in temperature and decreases with an increase in aggregate size.

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