Experimental Investigation of Moisture Sensitivity and Damage Evolution of Porous Asphalt Mixtures.
Experimental Investigation of Moisture Sensitivity and Damage Evolution of Porous Asphalt Mixtures.
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DOI：
10.3390/ma14237151
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发表时间：
2021-11-24
期刊：
影响因子：
--
通讯作者：
Shi J
中科院分区：
文献类型：
--
作者：
Hu X;Wang X;Zheng N;Li Q;Shi J
多孔沥青（PA）混合料具有高空隙（AV）（即18~22%）含量，允许雨水渗透到其内部结构中。因此，与传统的密级配沥青混合料相比，PA混合料对水分损伤更敏感。然而，聚丙烯腈混合料的湿损伤演化过程尚不清楚。研究了聚酰胺混合料的湿损伤演化和耐久性损伤演化。采用间接拉伸试验（ITT）、ITT疲劳试验和Cantabro损失试验评估了PA混合材料的湿敏感性和耐久性，并建立了阶段ITT疲劳试验，研究了干湿条件下的损伤演变规律。间接拉伸强度（ITS）、疲劳寿命、间接拉伸回弹模量(E)和耐久性随湿损伤次数和加载次数的增加而降低。疲劳寿命对湿损伤更为敏感。ITS和E在前3000次加载循环中下降幅度最大，而PA混合物在下降幅度超过60%时趋于失效。提出了基于ITS和E的损伤因子来预测聚丙烯腈混合料的加载历史。在干燥条件下，耐久性损伤演化和损伤因子符合指数模型。水分对PA混合料的湿损伤演化和耐久性损伤演化具有显著的影响和加速作用。
Porous asphalt (PA) mixtures are designed with a high air void (AV) (i.e., 18~22%) content allowing rainwater to infiltrate into their internal structures. Therefore, PA mixtures are more sensitive to moisture damage than traditional densely graded asphalt mixtures. However, the moisture damage evolution of PA mixtures is still unclear. The objective of this study was to investigate the moisture damage evolution and durability damage evolution of PA mixtures. The indirect tensile test (ITT), ITT fatigue test, and Cantabro loss test were used to evaluate the moisture sensitivity and durability of PA mixtures, and a staged ITT fatigue test was developed to investigate the damage evolutions under dry and wet conditions. Indirect tensile strength (ITS), fatigue life, indirect tensile resilience modulus (E), and durability decreased with the increment of moisture damage and loading cycles. The fatigue life is more sensitive to the moisture damage. The largest decrements in ITS and E were found in the first 3000 loading cycles, and PA mixtures tended to fail when the decrement exceeded 60%. Damage factors based on the ITS and E are proposed to predict the loading history of PA mixtures. The durability damage evolution and damage factors could fit an exponential model under dry conditions. Moisture had a significant influence and an acceleration function on the moisture damage evolution and durability damage evolution of PA mixtures.
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