Effect of Cement and Lime on Moisture Susceptibility Cold Recycled Asphalt Mixtures with SBS Modified Emulsion

Damage Caused by moisture, one of the most important distresses in cold recycled flexible pavements. To overcome this problem, the materials that improve adhesion between aggregate and bitumen should use. In this research we used SBS polymer, cement and lime to improve adhesion between reclaimed aggregate pavement (RAP) and decrease moisture susceptibility. We used SBS for product polymeric bitumen emulsion and also cement and lime utilized as additive in recycled aggregate. Also, considering to type of aggregate, CSS-1 emulsion was used in this research. For evaluate moisture susceptibility of mixture, mechanical flooding and indirect tensile strength (ITS) carried out. Results from both tests demonstrate that SBS, cement and lime decrease moisture susceptibility and SBS role most effective in decreasing moisture susceptibility of RAP mixtures. It must note that best result was observed in specimens made with polymeric bitumen emulsion and cement.