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首页> 外文会议>Performance Tests for Hot Mix Asphalt(HMA) Including Fundamental and Empirical Procedures >Characterization of Asphalt Concrete by Multi-Stage True Triaxiai Testing
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Characterization of Asphalt Concrete by Multi-Stage True Triaxiai Testing

机译：真Traxiai多阶段测试表征沥青混凝土

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摘要

The feasibility of an existing servo-controlled true triaxiai (cubical) apparatus for evaluating the mechanical response of nominal 4-in. cubical specimens of asphalt concrete (AC) under multi-axial stress states has been investigated. The apparatus allows the testing of specimens along a wide range of stress paths and stress levels that are not achievable in a conventional uniaxial or cylindrical apparatus. A multi-stage testing scheme can be followed by simultaneous control of the major, Intermediate, and minor principal stresses directly applied to the specimens. Two cubical AC specimens cut from two WesTrack block samples were subjected to a series of multi-stage stress paths that included triaxiai compression (TC), triaxiai extension (TE), simple shear (SS), conventional triaxiai compression (CTC), conventional triaxiai extension (CTE), and cyclic conventional triaxiai extension (CCTE). Experimental data were analyzed to assess volumetric creeping properties, resilient response, plastic deformation response, Poisson's ratio, loss angle, and dilatancy of asphalt concrete under general stress states. Test results highlight the potential of the cubical cell for mechanical characterization of asphalt concrete in a broad range of applications involving true triaxiai stress states. Analysis of test results indicates all of the following: (a) Modulus of AC shows significant anisotropy in different orientations; (b) Volumetric creeping of AC is considerably significant at relatively high pressures; (c) AC shows significant dilatancy; and (d) Cubical Device can distinguish mixes of different performance.
机译：现有的伺服控制真三角仪（立方）设备用于评估标称4英寸机械响应的可行性。研究了多轴应力状态下沥青混凝土（AC）的立方试样。该设备允许沿着大范围的应力路径和常规的单轴或圆柱设备无法达到的应力水平测试样品。遵循多阶段测试方案，可以同时控制直接施加到样品上的主要，中间和次要主应力。从两个WesTrack块样品中切出的两个立方AC样品受到一系列多阶段应力路径的影响，包括Triaxiai压缩（TC），triaxiai扩展（TE），简单剪切（SS），常规Triaxiai压缩（CTC），常规Triaxiai扩展（CTE）和循环常规Triaxiai扩展（CCTE）。分析实验数据以评估在一般应力状态下沥青混凝土的体积蠕变特性，弹性响应，塑性变形响应，泊松比，损耗角和膨胀率。测试结果突出了立方晶胞在涉及真实三轴应力状态的广泛应用中对沥青混凝土进行机械表征的潜力。对测试结果的分析表明以下所有内容：（a）AC模量在不同方向上显示出明显的各向异性； （b）在相对较高的压力下，交流电的体积蠕变非常重要； （c）AC显示出明显的扩张性； （d）Cubical Device可以区分不同表现的组合。

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