United States Department of Transportation
i
Develop Draft Chip Seal Cover Aggregate Specification Based on AIMS Angularity, Shape and Texture Test Results [March 2013]
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2013-03-01
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[PDF-3.18 MB]
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Abstract:The objective of the study is to improve Oklahoma Department of Transportation (ODOT) chip
seal design and performance through introducing new criteria for the selection of cover
aggregate and binder. These criteria will be based upon the recent technological advances in
the characterization of aggregate shape and texture as well as aggregate-binder compatibility.
The study evaluates the shape and texture-related index properties, as well as durability, of
commonly used cover aggregates in chip seal programs in Oklahoma. Additionally, it will
provide a methodology for inclusion of these characteristics as a metric in future chip seal
specifications. The study includes both laboratory testing and construction and performance
evaluation of chip seal test sections. The study is ongoing and is quantifying how well the
newly developed performance-based uniformity coefficient (PUC) correlate with chip seal
performance in Oklahoma, and if it should be incorporated into state chip seal specifications. It
has generated aggregate-binder compatibility data, based on the surface free energy
(compatibility ratio) approach, for commonly used aggregates and asphalt emulsion binders in
Oklahoma. Moreover, the chip seal construction practice followed by different ODOT
Maintenance Divisions was documented and the best practice identified. This repository of
information will be a useful resource for ODOT maintenance divisions.
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