Evaluation of Rutting Potential of Polymer Modified Asphalt Binder Using Multiple Stress Creep and Recovery Method

Ahad Ali, Zia ur Rehman, Umer Farooq, Muhammad Waseem Mirza


Asphalt is a viscoelastic material as its properties depend on the temperature, loading and aging conditions. High temperature causes flexibility in asphalt concrete as a result the mix is more susceptible to the rutting and the low temperature causes the stiff asphalt and the thermal cracking problem is more significant in this case. This research is aimed at evaluating the rutting susceptibility of neat and polymer modified asphalt by Performance Grading Plus test Multiple Stress Creep and Recovery test (MSCR). MSCR is effective for neat and polymer modified asphalts and also it is blind to the modification type. In this research asphalt neat samples of KRL (40-50, 60-70, 80-100) and ARL (60-70, 80-100) were used. ARL (60-70) was modified with Elvaloy® RET (Reactive Elastomeric Terpolymer) and KRL (60-70) was modified with Elvaloy® AC (Acrylate Terpolymer). Polymer percentages used for ARL (60-70) were 0% (neat), 1.35%, 1.70% and 2.0% whereas for KRL (60-70) was 0% (neat), 2.50%, 3.50% and 4.5%. Dynamic Shear Rheometer (DSR) was used to carry out MSCR test at stress levels of 100Pa and 3200Pa and at temperatures of 580C, 640C, 700C and 760C. Performance of asphalt was evaluated by analyzing the non-recoverable creep compliance (Jnr), Peak strain and Percent recovery. Modified temperature grade of asphalt were determined by comparing the actual Jnr value to the Jnr=9.46 as it corresponds to the G*/Sin δ =1000Pa. Results showed that neat sample of KRL compared to neat samples of ARL were found good to prevent rutting as they showed less peak strain, more percent recovery and less Jnr value. Polymer modification improved the properties of asphalt as it showed decreasing trend of peak strain, increasing trend of the percent recovery and also decreasing trend of Jnr values. Further high temperature grade bumping happened for polymer modified asphalts.

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