Rutting Potential of Half Warm Asphalt Mixture Using Polymer Modified Bitumen Emulsion

The half warm mix asphalt (HWMA) are considered as low energy mixtures and can be used for all climatic and traffic conditions. The half-warm bituminous specimens were prepared at the temperatures less than or equal to 100°C using 12% of polymer modified bitumen emulsion by weight of aggregates. Indirect tensile strength ratio (ITSR) was 81.4 and 53.1% respectively for HWMA and cold mix asphalt (CMA) without antistripping agent. Hence, an attempt was made to improve the ITSR values by adding antistripping agent and the values were marginally increased to 84.0 and 59.4% respectively for HWMA and CMA. However, 2% lime was added as filler in the HWMA mixture. The rutting values of HWMA mixture was 14 mm at 10,000 cycles under submerged condition, when tested in accordance with AASHTO T324, despite the fact that the used aggregates had the water absorption of 2.80%. From the present study, it can be concluded that the HWMA mixtures could be a good alternative solution for the maintenance of city roads as it is expected to perform satisfactorily while producing lesser carbon emissions, thus helping the environment.