ABSTRACT

Asphalt concrete (AC) is a composite material that exhibits time and temperature-dependent properties, and it is generally accepted that AC behaves as a linear viscoelastic solid at small strain levels. Nevertheless, different mechanisms and the damage evolution can change its behaviour from the linear viscoelasticity. This study was focused on identifying the causes of the deviation of AC viscoelastic properties under different loading conditions and at small strain levels during complex modulus tests. Sinusoidal tension–compression and compression tests on six asphalt mixtures produced with the same aggregate gradation but different asphalt binders under stress- and strain-controlled conditions were performed within a defined range of frequencies and temperatures. It was found that aggregate interaction and energy dissipation characteristics were the main mechanisms that influenced deviations in the viscoelastic properties, but they were only significant at high temperatures and during considerable nonrecoverable accumulated deformation.

摘要

沥青混凝土 (AC) 是一种复合材料，具有与时间和温度相关的特性，并且普遍认为 AC 在小应变水平下表现为线性粘弹性固体。然而，不同的机制和损伤演变可以从线性粘弹性改变其行为。本研究的重点是确定在复杂模量测试期间不同载荷条件下和小应变水平下 AC 粘弹性性能偏差的原因。在应力和应变控制条件下，对使用相同骨料级配但不同沥青粘合剂生产的六种沥青混合料在规定的频率和温度范围内进行正弦拉伸-压缩和压缩试验。