United States Department of Transportation
i
Performance oriented guidance for Mississippi chip seals - volume I.
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2013-12-01
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[PDF-3.95 MB]
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Abstract:A five year laboratory study was conducted to investigate near surface properties of flexible pavements in relation to
how they are affected by bituminous surface treatments. Chip seals and scrub seals (a specialized type of chip seal)
were the focus of the study. Seven emulsions, three aggregates, and four asphalt pavement types were tested. The
overall objective was to provide MDOT with performance oriented guidance for chip seals. This overall objective
was divided into aggregate retention and rejuvenation of the existing pavement’s near surface. Repeated creep of
mixture bars, viscosity change of recovered binder, and Bending Beam Rheometer (BBR) mixture beam responses
were used to assess rejuvenation effects of chip seals on a pavement’s near surface. Vialit adhesion, frosted marble,
and sweep testing were used to assess aggregate retention behavior. Within the six test methods studied, some were
used without modification, while others were modified during this research. Over 2,000 experiments were performed
for this report. Key rejuvenation testing included: 24 repeated creep torsion bars, 168 viscosity change
measurements, and 959 BBR mixture beams. Key aggregate retention testing included: 231 Vialit trays, 221 frosted
marble trays, and 533 sweep pads. Key performance oriented recommendations included: requiring a minimum m-value increase of a BBR mixture beam due to emulsion application when rejuvenation is of high importance,
monitoring moisture loss of a chip seal system for traffic opening determination, and specifying chip seal systems
(i.e. aggregate and emulsion) as opposed to independently approving chip seal materials.
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