Damage Evolution of Fiber Reinforced Epoxy Asphalt Concrete under Freeze-thaw Action
In order to investigate the basalt fiber reinforced epoxy asphalt concrete deterioration law in the seasonal frozen region,firstly,the fiber length and content were preliminarily calculated by using the asphalt viscosity-temperature curve analysis and direct tensile performance test.The road performance of epoxy asphalt concrete's(EAC)was compared before and after the fiber modification,the most suitable fiber length and content were further assessed,to form the design process of basalt fiber reinforced epoxy asphalt concrete(FEAC).The flexural tensile strength,flexural tensile strain,flexural stiffness modulus,and flexural strain energy density of asphalt concrete with various degrees of freeze-thaw damage were evaluated in low-temperature bending tests.The results show that FEAC with 6％(mass fraction)basalt fiber content has better high-temperature performance and low-temperature cracking resistance,and maintain comparable water stability to EAC.The flexuraltensile strength,flexural stiffness modulus and flexural strain energy density of EAC and FEAC gradually decrease with the increase of the number of freeze-thaw cycles,while the flexuraltensile strain shows the opposite trend.Compared with EAC,FEAC shows higher flexural strength,flexural tensile strain and lower flexural stiffness modulus.The flexural strain energy density of both FEAC and EAC show an obvious three-stage performance decrease with freeze-thaw damage changes.The s-shaped logistic function can adequately explain the damage change rule of freeze-thaw cycles,the model parameters a,k,and xc show positive contribution on slowing down the rise of of freeze-thaw damage of EAC.
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