Research on fatigue performance of composite crumb rubber modified asphalt mixture under freeze thaw cycles
Research on fatigue performance of composite crumb rubber modified asphalt mixture under freeze thaw cycles
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DOI：
10.1016/j.conbuildmat.2022.126603
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发表时间：
2022-02-01
影响因子：
7.4
通讯作者：
Guo, Yingying
中科院分区：
文献类型：
--
作者：
Guo, Zhixiang;Wang, Lan;Guo, Yingying
为研究冻融循环对复合橡胶粉改性沥青混合料（CCRMA）疲劳损伤特性的影响，采用循环弯曲疲劳试验和数字散斑相关方法（DSCM）相结合的方法，分析了冻融循环下CCRMA和苯乙烯-丁二烯-苯乙烯改性沥青混合料（SBSMA）的疲劳损伤特性。提出以沥青混合料劲度模量退化率曲线的平台值PV作为评价沥青混合料宏观疲劳损伤演化的分析指标。通过对主裂缝区水平应变特征云图的分析，确定了水平应变密度（DE值）作为评价沥青混合料细观疲劳损伤演化的指标。结果表明，冻融循环后，沥青混凝土的PV增大，DE减小，疲劳损伤速率加快，疲劳抗力降低。CCRMA具有比SBSMA更好的抗冻融性和抗疲劳性。所建立的疲劳损伤模型具有较高的拟合精度，能够有效地反映沥青混合料的疲劳损伤演化程度。通过对PV值和DE值的相关性分析，发现两者之间具有良好的线性相关性，表明将DSCM方法应用于沥青混合料弯曲疲劳试验研究其疲劳损伤特性是可靠的。
To study the effect of freeze thaw cycles on the fatigue damage characteristics of composite crumb rubber modified asphalt mixture (CCRMA), the semicircle bending fatigue test and the digital speckle correlation method (DSCM) were combined and the fatigue damage characteristics of CCRMA and styrene-butadienestyrene-modified asphalt mixture (SBSMA) under freeze thaw cycles were analyzed. The plateau valve (PV) of the stiffness modulus degradation ratio curve of the asphalt mixture is proposed as the analysis index to evaluate the macroscopic fatigue damage evolution of the asphalt mixture. The horizontal strain density (DE value) obtained through analyzing the horizontal strain characteristic cloud map of the main crack zone is identified as an index to evaluate the mesoscopic fatigue damage evolution of the asphalt mixture. The results show that after a freeze thaw cycle, the PV increases, DE decreases, fatigue damage rate accelerates, and fatigue resistance decreases. CCRMA has better freeze thaw resistance and fatigue resistance than SBSMA. The fatigue damage model established has high fitting accuracy and can effectively reflect the fatigue damage evolution degree of an asphalt mixture. A correlation analysis of PV and DE values reveals that there is a good linear correlation between them, indicating that applying the DSCM method to semicircle bending fatigue tests for studying the fatigue damage characteristics of asphalt mixtures is reliable.