An Experimental Study to Investigate the Effect on Tensile strength and Dynamic modulus of the addition of Portland cement to Cold In-Place Recycled Asphalt Using Indirect Tensile and Dynamic Modulus Tests

Cold In-Place Recycling (CIR) is an established pavement rehabilitation technique that involves reusing an existing asphalt pavement. The process generally utilizes 100% Reclaimed Asphalt Pavement (RAP) that is mixed with an emulsified asphalt. In this study, which is a project in partnership with the Ontario ministry of Transportation and various industry partners in Ontario, CIR mixes with a slow setting emulsion were prepared in the Centre of Pavement and Transportation Technology (CPATT) Laboratory at the University of Waterloo. In order to study the effect of Portland cement on the mechanical properties of Cold in Place Recycling, different percentages of Portland cement (0%, 0.25%, 0.5%, 0.75%, 1.5% and 3%) were added to the mixes. The mixes tested using the Indirect Tensile and Dynamic Modulus Tests to determine the strength and stiffness of the mixes. Furthermore, the moisture susceptibility was controlled by conditioning the specimens for 24 hours at 25 degrees Celsius. The results showed that increasing the percentage of Portland cement lead to an increase in the strength and the stiffness of the CIR mixes.