Establish Correlation Between Aggregate Properties and Pavement Friction.

摘要

Over the years the Maryland State Highway Administration (SHA) has encountered issues related to aggregate quality in regards to pavement friction. Furthermore, increased variability in aggregate friction test results has prompted a review of the existing approach to aggregate friction evaluation. To address this issue SHA has recently conducted a research project (Phase I) that had an objective to evaluate existing aggregate data including laboratory test results and petrographic analysis with particular focus on the frictional properties of aggregates. It was the objective of this research project (Phase II) to i) estimate pavement friction life for mixtures with aggregates from a variety of quarries, and ii) relate pavement friction to aggregate material properties. To achieve these objectives the project included: a review of the current state of practice in aggregate quality requirements and pavement friction measurements; merging of the SHA pavement friction records and aggregate/mixture database; comparison between pavement friction devices used by SHA; development of a methodology for predicting pavement friction life for any mixture and aggregate; and the quantification of pavement friction life (in terms of cumAADT, ESAL, friction life in years since construction, and FNdrop/10K) for common SHA mixtures and aggregates.