Research on Asphalt Damage Characteristics under Freeze-thaw Cycling
To provide a basis for the design,maintenance,service life evaluation,and frost damage assessment of asphalt pavement in different regions of China,the influence of temperature and freeze-thaw cycles on asphalt performance was investigated.The damage characteristics of asphalt before and after freeze-thaw cycling were discussed based on indoor freeze-thaw simulation experiments by examining the bending-tensile strength,fatigue life,and dynamic modulus under different temperature configurations and cycle numbers.The performance degradation characteristics of asphalt under freeze-thaw cycling were clarified.The temperature equivalent effect of freeze-thaw damage to asphalt was proposed.Freeze-thaw cycling caused severe damage to the low-temperature crack resistance of asphalt,with an overall performance degradation exceeding 50%after 30 cycles.The influence of thawing and freezing temperatures on asphalt damage differed and can be attributed to ice formation processes,classical thermodynamics,and expansion forces.Under freeze-thaw cycling alone,the performance degradation of asphalt exhibited a rapid decline followed by a slower deterioration.The impact of freeze-thaw cycling on asphalt performance was dominated by the cycle numbers and temperature,with the melting temperature having a more significant effect than the freezing temperature.Asphalt exhibited similar patterns in performance after 30 freeze-thaw cycles under different temperature configurations,and the temperature equivalent effect was elucidated.An equivalent model for the residual anti-cracking performance of asphalt after freeze-thaw cycling was established and the damage severity was simplified into three levels.
pavement engineeringfreeze-thaw cycledamage characteristicscrack resistancedeteriorate process
万方数据
维普
