Analysis on Splitting Characteristics of Asphalt Mixture under Freeze-Thaw Cycles in Cold Plateau Regions

Influence of freeze-thaw cycles as well as asphalt-aggregate ratio have been analyzed by means of splitting test on asphalt mixture under freeze-thaw conditions.The results showed that the splitting tension strength and failure stiffness modulus of asphalt mixture decreased as the times of freeze-thaw cycles increased,while the failure tensile strain has increased.The mixture performances attenuate in the initial freeze-thaw cycles and turn to gentle after 9～15times of freeze-thaw cycles.The influence of asphalt-aggregate ratio has significant influence of freeze-thaw cycle on the splitting characteristics,the influence of freeze-thaw cycle on the splitting characteristics decreases as the asphalt-aggregate ratio increase.It turns out to be that applying AC-13mixture with 5.5%OAC or larger can improve low temperature splitting characteristics of mixture under freeze-thaw conditions.The research results can provide references to the construction of asphalt pavement in cold plateau regions.