冻融循环下沥青混合料损伤特性研究  

Research on Asphalt Damage Characteristics under Freeze-thaw Cycling

作　　者：谭忆秋[1] 徐慧宁[1] 赵春丽 叶万里 TAN Yiqiu;XU Huining;ZHAO Chunli;YE Wanli(School of Transportation Science and Engineering,Harbin Institute of Technology,Harbin,China,150006;Heilongjiang Transport Development Co.Ltd.,Harbin,China,150060)

机构地区：[1]哈尔滨工业大学交通科学与工程学院,黑龙江哈尔滨150006 [2]黑龙江省交通投资集团有限公司,黑龙江哈尔滨150060

出　　处：《沈阳建筑大学学报（自然科学版）》2024年第5期778-788,共11页Journal of Shenyang Jianzhu University：Natural Science

基　　金：国家自然科学基金区域创新发展联合基金项目(U20A20315)。

摘　　要：目的 探究季节冻土地区温差和冻融循环等气候特点对沥青混合料使用性能的影响,为我国不同地区的沥青路面设计、养护、寿命评估和冻融损伤评估提供依据。方法 采用室内冻融循环模拟试验,根据不同温度配置和不同循环次数下沥青混合料的弯拉强度、疲劳寿命和单轴压缩动态模量的衰减,研究冻融循环作用前后沥青混合料的损伤特征,明确冻融循环下沥青混合料的性能衰变特征,最终提出沥青混合料冻融损伤温度等效效应。结果 冻融循环对沥青混合料低温抗裂性能造成严重破坏,冻融循环30次后性能的衰减幅度总体上超过50%。融化温度和冻结温度对沥青混合料损伤的影响存在差异,且归因于结冰过程、经典热力学和膨胀力三个方面。在仅冻融循环作用下,沥青混合料的性能衰减表现出先快速下降,后缓慢下降的特征。结论 冻融循环对沥青混合料性能的影响程度受循环次数和温度条件影响,其中融化温度较冻结温度对性能的影响更为显著。不同温度配置下冻融30次后的沥青混合料性能表现出相似的分布规律,明确了温度等效效应。建立了混合料冻融循环后的残余抗裂性能的等效模型,将损伤程度简化为三个等级。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.

关 键 词：道路工程 冻融循环 损伤特征 抗裂性能 衰变规律 

分 类 号：U416[交通运输工程—道路与铁道工程]