Characterization of HMA Moisture Damage Using Surface Energy and Fracture Properties (With Discussion)
Characterization of HMA Moisture Damage Using Surface Energy and Fracture Properties (With Discussion)
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发表时间：
2006
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通讯作者：
E. Masad;C. Zollinger;R. Bulut;D. Little;R. Lytton
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作者：
E. Masad;C. Zollinger;R. Bulut;D. Little;R. Lytton
沥青混合料中的水分损害可以定义为由于粘结剂-集料界面处（粘结破坏）或粘结剂内（内聚破坏）存在水分而导致的强度和耐久性损失。本研究的重点是通过了解影响集料和沥青之间的粘结强度，粘结剂和/或砂胶（粘结剂和矿物填料）的内聚强度，以及粘弹性材料的断裂的机制来评估沥青混合料的水敏感性。粘合剂和内聚键能计算表面能测量。粘弹性和断裂性能得到使用循环，扭转应变控制加载砂沥青混合料的圆柱形试样，直到发生故障。使用动态机械分析仪（DMA）装置施加该载荷。在这项研究中开发的方法提供了一个指数，直接相关的沥青混合料的裂纹扩展进行动态加载。该指数是键能、粘弹性和断裂性能的函数。所开发的方法被用来评估一些沥青混合料，表现出良好或较差的性能在现场。在大多数情况下，现场混合物的抗湿损伤被发现是有关的混合物的键能，DMA中的累积损伤，和裂纹扩展指数。
Moisture damage in asphalt mixtures can be defined as loss of strength and durability due to the presence of moisture at the binder-aggregate interface (adhesive failure) or within the binder (cohesive failure). This study focuses on evaluating the moisture susceptibility of asphalt mixtures through understanding the mechanisms that influence the adhesive bond between aggregate and asphalt, the cohesive strength of the binder and/or mastic (binder and mineral filler), and fracture of viscoelastic materials. Adhesive and cohesive bond energies are calculated from surface energy measurements. The viscoelastic and fracture properties are obtained using cyclic, torsional strain-controlled loading on cylindrical specimens of sand asphalt mixes until failure occurs. The Dynamic Mechanical Analyzer (DMA) apparatus was used to apply this loading. A methodology is developed in this study to provide an index that is directly related to crack growth in asphalt mixtures subjected to dynamic loading. This index is a function of bond energy, viscoelastic properties, and fracture properties. The developed methodology was used to evaluate a number of asphalt mixtures that exhibited good or poor performance in the field. The resistance of the field mixtures to moisture damage was found in most cases to be related to the mixtures bond energies, the accumulated damage in DMA, and the crack growth index.