ABSTRACT

This paper presents a new asphalt mixture design framework for predictive performance-engineered mix design (PEMD) and the theory and procedures that underlie the proposed design method. This method allows pavement engineers to determine an optimized mix design based on the predicted pavement/mixture performance for all possible combinations of a given set of component materials (i.e. aggregate and binder) in the design space. The proposed PEMD process is based on the ‘performance-volumetrics relationship’ (PVR) concept. The calibration of the PVR is based on the mixture performance predicted from FlexPAVE^TM, a three-dimensional finite element program that performs viscoelastic analysis under moving loads, using the material properties of the asphalt mixture in question at widely spaced volumetric conditions. Three mixtures of different nominal maximum aggregate sizes and binder types are used to demonstrate the proposed PEMD process. Finally, the predicted performance results obtained from different design approaches are compared.

摘要

本文介绍了一种新的沥青混合料设计框架，用于预测性能工程混合设计 (PEMD) 以及所提出的设计方法所依据的理论和程序。这种方法允许路面工程师根据设计空间中一组给定组分材料（即骨料和粘合剂）的所有可能组合的预测路面/混合料性能来确定优化的混合料设计。拟议的 PEMD 过程基于“性能-体积关系”(PVR) 概念。PVR 的校准基于从 FlexPAVE ^{TM预测的混合物性能}，一个三维有限元程序，它在移动载荷下执行粘弹性分析，使用所讨论的沥青混合料在广泛分布的体积条件下的材料特性。三种不同标称最大骨料尺寸和粘合剂类型的混合物用于展示所提出的 PEMD 工艺。最后，比较了从不同设计方法获得的预测性能结果。