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Evaluation of Moisture Sensitivity of Bituminous Mixtures by a Complex Modulus Approach

机译：复杂模量法评估沥青混合料的水分敏感性

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Various laboratory tests are used to evaluate the moisture sensitivity of bituminous mixtures. However, most of them are destructive and require a large number of specimens. Consequently, they do not permit continuous monitoring of the deterioration in mechanical performance, much less measurement of the recovery of this performance, as water evaporates during the drying process. Monitoring of the stiffness modulus could provide a clearer picture of the process of deterioration and recovery that occurs during an immersion-drying cycle. However, during the specimen immersion phases, bitumen ages and hardens, and its stiffness modulus increases. Thus, the action of water simultaneously produces deterioration in the bitumen-aggregate bond and hardening of the binder; these two processes lead to opposing responses and prevent making a clear appraisal of the bituminous mixture's ability to withstand the action of water. Evaluating the mechanical characteristics of bituminous mixtures with a Cole-Cole plot or in black space provides new possibilities for isolating the effect of water at the bitumen-aggregate interface from the effect of the binder.
机译：各种实验室测试用于评估沥青混合物的水分敏感性。但是，它们大多数具有破坏性，需要大量标本。因此，由于在干燥过程中水分蒸发，它们不能连续监测机械性能的下降，更不能测量这种性能的恢复。刚度模量的监测可以提供在浸泡-干燥循环过程中发生的劣化和恢复过程的更清晰图片。但是，在试样浸入阶段，沥青会老化并变硬，其刚度模量会增加。因此，水的作用同时导致沥青-骨料粘结的劣化和粘合剂的硬化；这两个过程导致相反的响应，并且无法对沥青混合物的耐水作用进行明确评估。用Cole-Cole曲线或在黑色空间中评估沥青混合物的机械特性，为将水在沥青-骨料界面处的作用与粘合剂的作用隔离开来提供了新的可能性。

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