ABSTRACT

The use of index parameters to evaluate the performance of asphalt mixtures has become an important process for making informed pavement material decisions. These index parameters are indicators of asphalt mixture performance and thus are widely used in the asphalt paving industry. This paper presents a new rutting index parameter to assess the rutting resistance of asphalt mixtures using the stress sweep rutting test and the permanent deformation shift model. The proposed parameter, referred to as the Rutting Strain Index (RSI), is novel in that it integrates material testing and structural simulations. To develop the RSI index parameter, more than 70 mixtures from different geographical locations that exhibit a wide variety of performance were evaluated. The results show that the RSI is able to capture the effects of mix design factors, such as RAP content, binder content, and volumetric properties. Furthermore, a set of RSI threshold values are proposed for different allowable traffic levels in terms of rutting. The RSI can be employed by agencies as a tool for performance engineered mix design and quality assurance purposes whereby agencies will be able to accept or reject a mixture based on RSI thresholds.

摘要

使用指标参数来评估沥青混合料的性能已成为做出明智的路面材料决策的重要过程。这些指标参数是沥青混合料性能的指标，因此被广泛应用于沥青摊铺行业。本文提出了一种新的车辙指数参数，用于利用应力扫描车辙试验和永久变形位移模型来评估沥青混合料的抗车辙性能。被称为车辙应变指数 (RSI) 的建议参数是新颖的，因为它集成了材料测试和结构模拟。为了开发 RSI 指数参数，对来自不同地理位置、表现出多种性能的 70 多种混合物进行了评估。结果表明，RSI 能够捕捉混合设计因素的影响，例如 RAP 含量、粘合剂含量和体积特性。此外，针对车辙方面的不同允许流量水平，提出了一组 RSI 阈值。机构可以将 RSI 用作性能工程混合设计和质量保证目的的工具，从而使机构能够根据 RSI 阈值接受或拒绝混合物。