The development of correlations between HMA pavement performance and aggregate shape properties

摘要

The physical characteristics of aggregates (form, angularity, and texture) areknown to affect the performance of hot mix asphalt (HMA) pavements. Efforts todevelop relationships between these aggregate characteristics and aggregate performancein HMA pavements have been limited in the past due to inherent inaccuracies in themethods used to measure these characteristics. The recently developed AggregateImaging System (AIMS) offers an opportunity to accurately measure aggregate shapecharacteristics allowing them to be properly related to asphalt performance.This research focused on relating the aggregate characteristics of form,angularity, and texture measured using AIMS to laboratory performance measurementson a wide variety of HMA mixes. The performance of these mixes was evaluated inthree projects carried out by the Federal Highway Administration (FHWA) and theTexas Transportation Institute (TTI). During this research, a database of the volumetric,performance, and aggregate shape measurements for mixes used in these projects wascreated. Statistical analysis was conducted to correlate HMA performance parameters tovolumetric and aggregate shape characteristics. The results show the dominant effectthat aggregate shape properties have on HMA performance.