ABSTRACT

The objective of this study is to assess the impact of climate on the performance of bituminous pavements with two different methods, and then to examine their impact on actual design scenarios. Three climate cases were selected for the comparisons involving the effect of temperature: one in France (Bordeaux) and two in the United States (Seattle and Phoenix). The case of an experimental site in Québec was also used for comparisons concerning consideration for seasonal variations in ground bearing capacity. The analyses were based on French (Alizé-LCPC) and US (AASHTOWare Pavement ME Design) mechanistic-empirical pavement design approaches. Interesting features of the two design methods are outlined and their fatigue cracking models are linked together. The results of the study highlight the importance, for design purposes, of the empirical fatigue equations as a function of temperature. For the site studied in France, the design results in terms of AC base layer thicknesses indicate that both methods show a similar trend with an increase in temperature. For the site in Québec, which is submitted to severe freeze/thaw cycles, the results show that taking temperature and moisture into account for unbound materials leads to a prediction of more severe permanent deformation.

Highlights

• Presentation of two mechanistic-empirical (ME) methods for pavement design

• Description of the fatigue equations governing asphalt mixes for design purposes

• Identification of the parameters used in the design of pavement structures

• Study of the influence of the climate in France and Québec on pavement performance

• Comparison of the French and US methods for pavement design and correspondence between them

摘要

本研究的目的是用两种不同的方法评估气候对沥青路面性能的影响，然后检查它们对实际设计方案的影响。选择了三个气候案例进行涉及温度影响的比较：一个在法国（波尔多），两个在美国（西雅图和凤凰城）。魁北克的一个实验地点的案例也用于比较考虑地面承载力的季节性变化。分析基于法国 (Alizé-LCPC) 和美国 (AASHTOWare Pavement ME Design) 机械经验路面设计方法。概述了两种设计方法的有趣特征，并将它们的疲劳开裂模型联系在一起。研究结果强调了设计的重要性，作为温度函数的经验疲劳方程。对于在法国研究的场地，根据 AC 基层厚度的设计结果表明，随着温度的升高，两种方法都显示出相似的趋势。对于处于严重冻融循环的魁北克现场，结果表明，将温度和湿度考虑在内的未结合材料会导致预测更严重的永久变形。

强调

• 介绍两种用于路面设计的机械经验 (ME) 方法

• 用于设计目的的控制沥青混合料的疲劳方程的描述

• 识别用于路面结构设计的参数

• 法国和魁北克气候对路面性能影响的研究

• 法美路面设计方法比较及对应关系