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首页> 外文会议>Airfield and Highway Pavement Specialty Conference; 20060430-0503; Atlanta,GA(US) >A Mechanistic Approach to Determine Price Reduction Factors for Density-Deficient Asphalt Pavements
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A Mechanistic Approach to Determine Price Reduction Factors for Density-Deficient Asphalt Pavements

机译：确定密度不足的沥青路面降价因素的机械方法

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This paper presents the research undertaken for the development of price reduction factors for density-deficient asphalt pavements. Performance characteristics included in this study are fatigue cracking and rutting. Air void models for the dynamic modulus, fatigue cracking, and rutting were developed using laboratory test data. The results from the material level performance tests and the third-scale Model Mobile Loading Simulator (MMLS3) tests allowed the calculation of the PRF values. It was found that the PRF values are not sensitive to the testing methodology used; rather, they are significantly different depending upon which performance characteristic is used (i.e., fatigue cracking vs. rutting). Pavement performance prediction methodologies based on the cumulative damage analysis were developed that predict the fatigue life and permanent deformation growth of the asphalt pavement under the MMLS3 loading. These methodologies are based on material level performance models, multilayered elastic analysis, and the time-temperature superposition principle to account for the differences between the material level testing conditions and the MMLS3 testing conditions. It was found that the prediction methodologies yield reasonable predictions of fatigue life and permanent deformation growth of asphalt slabs under the MMLS3 loading. These pavement performance prediction methodologies were implemented into the computer program called AP4 (Asphalt Pavement Performance Prediction Program). This program allows the determination of the service life for fatigue cracking and rutting based on the inputs of air void contents in all the HMA layers. Case studies of five density-deficient pavements were conducted, which resulted in reasonable price reductions.
机译：本文介绍了为开发密度不足的沥青路面降价因素而进行的研究。这项研究包括的性能特征是疲劳裂纹和车辙。使用实验室测试数据开发了用于动态模量，疲劳裂纹和车辙的气孔模型。材料级性能测试和第三级模型移动加载模拟器（MMLS3）测试的结果允许计算PRF值。结果发现，PRF值对所使用的测试方法不敏感。而是根据所使用的性能特征（即疲劳裂纹与车辙）显着不同。开发了基于累积损伤分析的路面性能预测方法，该方法可预测MMLS3载荷下沥青路面的疲劳寿命和永久变形增长。这些方法基于材料级性能模型，多层弹性分析和时温叠加原理，以说明材料级测试条件与MMLS3测试条件之间的差异。研究发现，该预测方法能够对MMLS3载荷下沥青板的疲劳寿命和永久变形增长做出合理的预测。这些路面性能预测方法已在称为AP4（沥青路面性能预测程序）的计算机程序中实现。该程序可以根据所有HMA层中的气孔含量来确定疲劳裂纹和车辙的使用寿命。对五个密度不足的人行道进行了案例研究，从而合理地降低了价格。

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