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 using an existing asphalt pavement. The process generally utilizes 100% Reclaimed Asphalt Pavement (RAP) that mixed with emulsified asphalt. In this study, which is a project in partnership with 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. Different percentages of Portland cement (0%, 0.25%, 0.5%, 0.75%, 1.5% and 3%) were added to the mixes and tested using Indirect Tensile Test to determine their strength. Furthermore, the moisture susceptibility was determine by conditioning the specimens for 24 hours at 25 degrees Celsius.  The horizontal and vertical deformations were measured on the surface of the specimens by mounting four Linear Variable Differential Transducers (LVDT). The deformation measurements are used to calculate the Poisson ratio. Finally, ANOVA test was carried out to analysis the obtained data statistically. The results showed that increasing the percentage of Portland cement leads to increase the strength of the CIR mixes.