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首页> 外文期刊>Journal of Construction Engineering and Management >Use of Mechanistic-Empirical Pavement Design Principles to Assign Asphalt Pavement Pay Factor Adjustments
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Use of Mechanistic-Empirical Pavement Design Principles to Assign Asphalt Pavement Pay Factor Adjustments

机译：机械-经验路面设计原理的使用来分配沥青路面付费系数调整

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This paper promotes the quality analysis of flexible pavements by exploring the role of analysis programs as laboratory support tools to assess the quality of constructed pavements. Specifically, the research explored the significance of laboratory dynamic modulus testing on assigning pay factor adjustments in these tools. In the United States, the current methods of pavement acceptance are based more on construction craftsmanship (i.e., density and smoothness, percent within limits) as opposed to how the pavement will actually perform once constructed. The use of performance-based specification models would enable a state transportation agency to quantify the impacts of varying as-built mixture quality in terms of (1) a projection of pavement service life, and (2) presenting life-cycle costs in a way that both agencies and contractors can understand. Two publicly available performance-related specification (PRS) quality assurance (QA) analysis tools have been developed based on mechanistic-empirical pavement design principles and were assessed for a small set of mixtures. The quality related specification software (QRSS) utilizes a predictive equation and traffic, binder, and mixture volumetric data to predict dynamic modulus (|£*|) values. The asphalt mixture performance tester (AMPT) QA program varies from the QRSS in that it uses the laboratory-measured E* as an input. Pavement distresses (i.e., rutting and fatigue cracking) are calculated based on both the as-designed job-mix formula and as-produced construction mixture properties. Then, a predicted service life difference (PLD) and the resultant pay factor adjustments are calculated based on the variance between the as-designed and as-produced mixtures. The distress and service life predictions from the two QA programs were similar for the conventional mixes, which may indicate that requiring a laboratory-tested dynamic modulus does not add significant benefit in the analysis of conventional mixtures. Furthermore, an analysis was done in the QRSS program to compare the impacts of the preloaded default binder values to the laboratory-measured binder properties. The results indicated that laboratory testing of binders is recommended for providing inputs to the QRSS since the in situ characteristics were not fully reflected by the default binder values in the program. The differences in the distress levels predicted for the unconventional mixture types indicated that the use of laboratory-measured |E~*| is necessary for setting pay factor adjustments, particularly since only conventional dense-graded mixtures were used to calibrate the models in the programs. The conditions under which the program-based analyses will have limitations are presented. Recommendations are provided on how agencies and contractors can improve the construction process by preliminary monitoring of pavement quality using the analysis tools.
机译：本文通过探讨分析程序作为评估建筑路面质量的实验室支持工具的作用，促进了柔性路面的质量分析。具体而言，研究探索了实验室动态模量测试在分配这些工具中的薪酬因子调整中的重要性。在美国，当前的路面验收方法更多地基于建筑工艺（即密度和光滑度，极限范围内的百分比），而不是一旦建造后实际将如何表现。基于性能的规范模型的使用将使州运输机构能够根据以下方面量化变化的混合料质量的影响：（1）路面使用寿命的预测；（2）以某种方式表示生命周期成本代理商和承包商都能理解的。基于机械-经验路面设计原理，开发了两个可公开获得的与性能相关的规范（PRS）质量保证（QA）分析工具，并对其中的一小部分混合物进行了评估。质量相关的规范软件（QRSS）利用预测方程式和交通量，粘合剂和混合物体积数据来预测动态模量（|£* |）值。沥青混合料性能测试仪（AMPT）QA程序与QRSS不同，因为它使用实验室测量的E *作为输入。路面应力（即车辙和疲劳裂纹）是根据设计的工作混合公式和生产的建筑混合料性能来计算的。然后，基于设计的混合物和生产的混合物之间的差异，计算预测的使用寿命差异（PLD）和最终的支付因子调整。两种质量保证程序对遇险和使用寿命的预测与常规混合物相似，这可能表明，需要实验室测试的动态模量不会对常规混合物的分析带来明显的好处。此外，在QRSS程序中进行了分析，以将预加载的默认粘合剂值的影响与实验室测量的粘合剂性能进行比较。结果表明，建议使用粘合剂的实验室测试为QRSS提供输入，因为程序中的默认粘合剂值并未完全反映原位特性。针对非常规混合物类型预测的遇险水平的差异表明，使用实验室测量的| E〜* |。设置薪酬因子调整是必要的，尤其是因为仅使用常规的高密度混合物来校准程序中的模型。介绍了基于程序的分析将受到限制的条件。提供了有关机构和承包商如何通过使用分析工具对路面质量进行初步监控来改善施工过程的建议。

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