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首页> 外文会议>Performance Tests for Hot Mix Asphalt(HMA) Including Fundamental and Empirical Procedures >Identification of a Physical Model to Evaluate Rutting Performance of Asphalt Mixtures
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Identification of a Physical Model to Evaluate Rutting Performance of Asphalt Mixtures

机译：确定用于评估沥青混合料车辙性能的物理模型

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摘要

The objective of this study is to identify a physical model that can provide reliable predictions about a mixture's ability to resist permanent deformation under realistic stress states. Key differences were identified between stress states under the existing Asphalt Pavement Analyzer (APA) loading device (hose) and stress states under radial truck tires, which may indicate potentially different rutting mechanisms. It was shown that the APA hose was not capturing the critical lateral stresses found to be detrimental to rutting and cracking of HMA pavements. A new loading device (rib) was designed and constructed for use in the APA that more closely represents stress states found under radial tires. Contact-stress measurements under the two loading devices - hose and rib - showed that the rib was able to reproduce the lateral stresses found under individual ribs on a radial-tire tread. Subsequent finite element modeling also showed that the rib appeared to generate similar shear stress patterns to those found under the modeled radial-tire load. A new method was developed to measure deformations on the surface of APA specimens, where a contour gauge was used to record and store the entire surface profile of the sample throughout the progress of the test. An area-change parameter, which reflects volume change, was introduced to calculate the volumetric changes in the specimen. The area-change parameter can be used to determine whether specimen rutting is primarily due to shear instability or consolidation. Two mixtures of known field performance - poor and good - were tested to evaluate the test's ability to predict performance with the new loading device and the new measurement and interpretation system. Results showed that the new system (loading strip and profile measurement method) appears to have greater potential of evaluating a mixture's potential for instability rutting than the original (hose and single rut-depth measurement) configuration.
机译：这项研究的目的是确定一种物理模型，该模型可以对混合物在实际应力状态下抵抗永久变形的能力提供可靠的预测。确定了现有沥青路面分析仪（APA）加载装置（软管）下的应力状态与子午线卡车轮胎下的应力状态之间的关键差异，这可能表明可能有不同的车辙机制。结果表明，APA软管无法捕获对HMA路面的车辙和开裂有害的临界侧向应力。设计并构造了一种新的加载装置（肋骨），用于APA，可以更精确地表示子午线轮胎的应力状态。在两个加载装置（软管和肋骨）下的接触应力测量表明，肋骨能够再现在径向轮胎胎面的单个肋骨下发现的侧向应力。随后的有限元建模也表明，肋骨似乎产生了与在模型径向轮胎载荷下发现的相似的切应力模式。开发了一种新的方法来测量APA样品表面的变形，其中使用轮廓仪记录并存储整个测试过程中样品的整个表面轮廓。引入反映体积变化的面积变化参数以计算样品中的体积变化。面积变化参数可用于确定样品的车辙主要是由于剪切不稳定性还是固结引起的。测试了两种已知现场性能的混合物（差的和好的），以评估该测试使用新的装载设备以及新的测量和解释系统预测性能的能力。结果表明，与原始配置（软管和单车辙深度测量）相比，新系统（装载带和型材测量方法）似乎具有更大的潜力来评估混合物的不稳定性车辙。

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