Pavement service life extension due to asphalt surface treatment interlayer : research project capsule.
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2016-07-01
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Abstract:The Louisiana Department of Transportation and Development (DOTD) has been
using asphalt surface treatment (AST) interlayers over soil cement base courses
as a means to mitigate shrinkage cracks from reflecting through the asphaltic
concrete (AC) pavement surfaces. There are currently no official DOTD guidelines
or policies for using AST interlayers. Determination of the cost effectiveness
for using AST interlayers in pavements has not been performed for Louisiana
roadways.
The main objectives of this study are to evaluate DOTD’s current AST interlayer
practice; determine the effectiveness of AST interlayers in terms of costs and
benefits; develop statistical performance prediction models for various pavement
distress types (with and without AST interlayers); and develop guidelines/policies
for the use of AST interlayers.
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