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首页> 外文会议>International Center for Aggregates Research Tenth Annual Symposium on Aggregates: Asphalt Concrete, Portland Cement Concrete, Bases, amp; Fines; Apr 14-17, 2002; Baltimore, Maryland >USING DYNAMIC MECHANICAL ANALYSIS AS A TOOL TO ACCESS THE SUITABILITY OF FILLERS IN ASPHALT MIXTURES BASED ON THE MASTIC PROPERTIES
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USING DYNAMIC MECHANICAL ANALYSIS AS A TOOL TO ACCESS THE SUITABILITY OF FILLERS IN ASPHALT MIXTURES BASED ON THE MASTIC PROPERTIES

机译：基于力学特性的动态力学分析作为工具来获取沥青混合料中填料的适宜性

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Dynamic mechanical analysis (DMA) is used to evaluate the microcracking damage potential in sand asphalt mixtures. Microcracking has been shown to be associated with both fatigue cracking damage and the accumulation of permanent damage (rutting) under repeated compressive loading. Testing is performed at 25℃ in controlled-strain, torsional loading. Failure is defined as the transition point in the plot of normalized dynamic modulus (ratio of dynamic modulus at any time to the initial value of dynamic modulus at the first loading cycle) versus number of loading cycles. The transition point was judged to be the best general indicator of fatigue failure. DMA testing is able to clearly differentiate among the effects of various mineral fillers. It can be used as a screening tool to assess the cohesive strength properties and damage sensitivity of various mastics and to select asphalt filler combinations that optimize mastic properties and hence mixture properties.
机译：动态力学分析（DMA）用于评估砂沥青混合物中微裂纹的破坏可能性。在反复的压缩载荷下，微裂纹与疲劳裂纹损伤和永久性损伤（车辙）的累积有关。测试是在25℃的受控应变，扭转载荷下进行的。失效定义为归一化动态模量（任何时候的动态模量与第一个加载循环中的动态模量初始值之比）与加载循环数之间的过渡点。过渡点被认为是疲劳失效的最佳一般指标。 DMA测试能够清楚地区分各种矿物填料的作用。它可以用作筛选工具，以评估各种胶粘剂的内聚强度性能和损伤敏感性，以及选择可优化胶粘剂性能并因此优化混合物性能的沥青填料组合。

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