United States Department of Transportation
i
Tests of HMA overlays using geosynthetics to reduce reflection cracking.
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2009-12-01
[PDF-4.93 MB]
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Alternative Title:Tests of hot mix asphalt overlays using geosynthetics to reduce reflection cracking
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Edition:Technical report; Sept. 1999-Aug. 2007.
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Abstract:The primary objective of this field phase of the research project was to evaluate geosynthetic
products placed under or within hot mix asphalt overlays to reduce the severity or delay the appearance of
reflection cracks and to calibrate and validate FPS-19 Design Check.
Multiple end-to-end test pavements incorporating geosynthetic products (fabrics, grids, and
composites) and including control sections were constructed in three different regions of Texas (Amarillo,
Waco, and Pharr Districts) with widely different climates and geological characteristics. Performance of
these test pavements has been monitored for five to six years, depending on the date of construction. The
oldest test pavements (Pharr) are exhibiting essentially no cracking. The Amarillo and Waco test pavements
are exhibiting a fair amount of low severity and a very small amount of medium-severity reflective cracking.
Based on measured cracks in the original pavement before overlaying, the percentage of reflective cracking
in each test section was calculated and plotted with time of pavement in service.
Calibration of FPS-19 Design Check could not be accomplished due to the absence of sufficient
amount of cracks with medium-severity level. Instead, using the field data, relative life ratio of test sections
was projected. Field specimens obtained from these test pavements were tested using the large overlay
tester. Field monitoring revealed that some geosynthetic products are effective in delaying reflective
cracking. They were relatively more effective in the Waco test pavement (concrete in mild climate) than the
A marillo test pavement (flexible in harsh climate).
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