Performance Comparison of Cold in Place Recycled and Conventional HMA Mixes

Abstract

Cold In-Place Recycling (CIR) of flexible pavements has been experimented and executed worldwide during the past twenty years. The performance of CIR projects is inconsistent in different parts of the world; furthermore its mix design is still under development. In local traffic and climatic conditions of Pakistan, this research work was focused to evaluate the structural performance of cold in-placed recycled mixes. This will assist the highway agencies of the country for making decision regarding future utilization of cold recycling technology, especially in the conditions of budgetary constraints for maintenance and rehabilitation and expanding highway network. For the structural evaluation of CIR pavements, Resilient Modulus Test and Static Creep test was performed on Marshall Samples of CIR mixes using UTM -5P with Cement and Lime being used as an additive at various temperatures and loading Frequencies and their strength was compared with conventional HMA mixes. It was concluded that the performance of cold recycling and conventional rehabilitation was nearly the same and the cement added cold recycled mixes were found better than lime added.