为了分析老化作用下沥青及沥青混合料疲劳性能的衰变规律,通过温度扫描试验、线性振幅扫描(LAS)试验、黏弹性连续损伤力学模型和半圆弯曲疲劳试验,并基于LAS试验结果进行中温性能评估,分析了70#和90#沥青及沥青混合料在不同老化程度下的抗疲劳性能变化规律。结果表明:老化导致沥青疲劳因子显著增大,抗疲劳性能下降,应力应变承受能力增大,且高标号沥青的耐老化性能优于低标号沥青。黏弹性连续损伤力学模型显示,老化降低了沥青的应变敏感性,并使完整性系数在更大累计损伤参数范围内衰减;中温性能评估表明,随着老化程度的加深,中温疲劳性能受到较为严重的损伤;长期老化对沥青混合料疲劳寿命的影响尤为明显,其疲劳寿命随老化程度加深呈下降趋势。此外,随着老化程度的增加,沥青混合料的疲劳寿命对应力敏感性降低。
In order to analyse the decay law of the fatigue performance of asphalt and asphalt mixtures under aging conditions,temperature scanning test,linear amplitude scanning (LAS) test,viscoelastic continuous damage mechanics model and semi-circular bending fatigue test were conducted.Based on the results of the LAS test for the assessment of the intermediate-temperature performance,the variation in fatigue resistance of 70# and 90# asphalt and asphalt mixtures under different degrees of aging was investigated.The results showed that aging significantly increased the asphalt fatigue factor,reduced fatigue resistance,and enhanced stress-strain bearing capacity.The aging resistance of high-grade asphalt was better than that of low-grade asphalt.The viscoelastic continuum damage mechanics model showed that aging reduced the asphalt's strain sensitivity and made the integrity factor in a larger cumulative damage parameter range of attenuation.The intermediate-temperature performance assessment showed that the fatigue performance at intermediate temperature was severely damaged with increasing aging degree.The fatigue life of asphalt mixtures was particularly affected by long-term aging,and the fatigue life of asphalt mixtures tended to decrease as aging progressed.In addition,the fatigue life of asphalt mixtures was less sensitive to stress as the degree of aging increases.
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基金资助
国家重点研发项目(2023YFB0604600);长安大学重点科研平台水平提升项目(300102213501)
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