Influence of virgin aggregate content and curing time to performance of emulsion cold recycled asphalt mixtures

Abstract

Paper presented at the 31st Annual Southern African Transport Conference 9-12 July 2012 "Getting Southern Africa to Work", CSIR International Convention Centre, Pretoria, South Africa.Cold recycling technologies utilizing emulsion as binder demonstrates a number of high environmental advantages and thus it is widely applied worldwide. There are many factors influencing the performance of emulsion recycled asphalt mixture, such as components, curing, aging etc. This study investigates the influence of proportion of virgin aggregate and curing time on the performance of recycled mixture. The mixture formulation design at three levels of virgin aggregate addition (0%, 10% and 20%) and one dosage of cement (1.5%) has been conducted. The performance of emulsion recycled asphalt mixture including splitting failure load, splitting failure strength and Freeze-thaw splitting strength has been measured at four curing times (0 day, 7 days, 14 days and 28 days). The effect of proportion of virgin aggregate and curing time on the performance of recycled mixture has been quantified accordingly. The research has manifested that the increment of the proportion of virgin aggregate and the curing time will enhance the performance of the emulsified asphalt cold recycled mixture up to 26%.