2005) Resilient Behaviour of Asphalt Concrete under Repeated Loading & Effects of Temperature

Abstract: In this paper resilient behavior of asphalt concrete mixes were studied by varying temperature & time of loading to understand the pavement behavior under Pakistani climatic conditions & to address the problem according to mode of distress. The common cause of pavement distress in Pakistan is rutting, which initiates due to uncontrolled axle load & large variation in temperature. Indirect Tensile and creep tests were carried out using Universal Testing Machine (UTM 5P) on the cores taken from Islamabad-Peshawar Motorway Section (M1), IJP Principal road dual carriage way (Links Islamabad to Grand Trunk Road) & mixes prepared in the laboratory. Both sections had been opened for traffic on 2nd, November, 2004. Polymer Modified Bitumen (PMB) has been used on M1 and is a unique opportunity to compare the behavior of in situ Asphalt Concrete mixes with & without PMB under same temperature & loading conditions. The results of laboratory tests on asphalt concrete cores (from M1 & IJP road) under the influence of load, environmental and mix variables are presented in this paper. 1