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Modelling and Laboratory Studies on the Adhesion Fatigue Performance for Thin-Film Asphalt and Aggregate System

机译：薄膜沥青和骨料系统粘附疲劳性能的建模与实验室研究

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Adhesion between asphalt and aggregate plays an important role in the performance of asphalt mixtures. A low-frequency adhesion fatigue test was proposed in this paper to study the effect of environment on the asphalt-aggregate adhesion system. The stress-based fatigue model had been utilized to describe the fatigue behavior of thin-film asphalt and aggregate system. The factors influencing the adhesion fatigue performance were also investigated. Experiment results show that asphalt has more important effect on the adhesion performance comparing with aggregate. Basalt, which is regarded as hydrophobic aggregates with low silica content, has better adhesion performance to asphalt binder when compared with granite. The effects of aging on the adhesion fatigue performance are different for PG64-22 and rubber asphalt. Long-term aging is found to reduce the adhesion fatigue lives for rubber asphalt and aggregate system, while the effect of long-term aging for aggregate and PG64-22 binder system is positive. Generally the increased stress amplitude and test temperature could induce greater damage and lead to less fatigue lives for adhesion test system.
机译：沥青和骨料之间的粘附在沥青混合物的性能方面发挥着重要作用。本文提出了一种低频粘合疲劳试验，研究了环境对沥青骨料粘附系统的影响。已经利用基于应力的疲劳模型来描述薄膜沥青和骨料系统的疲劳行为。还研究了影响粘附性能的因素。实验结果表明，沥青对与骨料相比的粘合性能具有更重要的影响。玄武岩被认为是具有低二氧化硅含量的疏水性聚集体，与花岗岩相比，对沥青粘合剂具有更好的粘附性能。老化对PG64-22和橡胶沥青的粘合疲劳性能的影响是不同的。发现长期老化可减少橡胶沥青和聚集体系的粘附疲劳，而长期老化骨料和PG64-22粘合剂系统的效果是阳性的。通常，增加的应力幅度和测试温度会引起更大的损伤并导致粘附测试系统的疲劳寿命更少。

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