Research on the performance of warm mix asphalt and mixtures based on low temperature performance
The modification mechanism and thermal stability of warm mix modified asphalt were analyzed by FTIR and TG-DSC tests respectively. The anti-aging performance of warm mix modified asphalt was evaluated by RTFO test and the formula of warm mixing agent was optimized;the high and low temperature performance of optimized warm mix modified asphalt was evaluated using DSR test,BBR test,and force ductility test,and compared with Sasobit and Evotherm M1 warm mix modified asphalt;the cooling amplitude of warm mixing agent and the road performance of warm mix asphalt mixture were studied through mixture experiments. The results indicate that the modification mechanism of warm mix modified asphalt is physical blending,and the thermal stability of warm mix modified asphalt can be guaranteed;the anti-aging ability of the warm mixing agent has been improved after the optimization of the formula;after adding wax-plastic warm mixing agent to SBS modified asphalt,the creep stiffness decreased by 37. 8％ at -18 ℃,and the creep rate increased by 9. 9％ at -18 ℃,and the low-temperature rheological properties were improved;the cooling amplitude of wax-plastic warm mixing agent is about 23 ℃,which is better than the cooling amplitude of 3％ Sasobit and 0. 5％ Evotherm M1. The high-temperature performance of wax-plastic warm mix modified asphalt mixture fully meets the requirements of low-temperature areas,and the low-temperature crack resistance and water damage resistance are significantly improved. Sasobit warm mixing agent can improve high-temperature rutting resistance,but it is not conducive to the low-temperature performance and water stability. Evotherm M1 warm mixing agent has little effect on the road performance of the mixtures.
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