Low Temperature Performance and Evaluation Index of Epoxy Asphalt Mixture

In order to establish a theoretical basis for the design of epoxy asphalt pavement under low temperature conditions, in this study, the cracking performance and evaluation indexes of epoxy asphalt mixtures under low temperature conditions were investigated through laboratory tests. Based on the applicability analysis results of various low temperature evaluation indexes of asphalt mixtures, splitting strength is recommended as an index for evaluating the low temperature resistance of epoxy asphalt mixtures. In the design of new epoxy asphalt pavement structures for cold regions, -31℃ is set as the critical cracking temperature design index of the surface layer at low temperatures, whereas low temperature splitting strength is regarded as the structural design control index. Results show that in epoxy asphalt mixtures, low temperature creep rate is small and low temperature plastic deformation ability is low, but low temperature anti-cracking performance is improved. The observed epoxy asphalt tensile strength is 1.3-2.0 times larger and stiffness modulus is 1.3-1.9 times larger than the corresponding properties of a similar type of modified asphalt mixture.