Cost effective prevention of reflective cracking of composite pavement.
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Cost effective prevention of reflective cracking of composite pavement.

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      Final report; 2008-2010.
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    • Abstract:
      Louisiana experimented with various techniques and treatments to control reflective cracking since the 1970s. The objective of this study is to evaluate and compare different reflective cracking control treatments by evaluating the performance, constructability, and cost-effectiveness of pavements built with these treatments across the state. To achieve this objective, a survey of current state practices identified the treatment methods that are used or that had been used to delay and mitigate reflective cracking in composite pavements. Based on this survey and a thorough review of LADOTD databases, pavement sections built with reflective crack control treatment methods were identified. Projects with sufficient years in service and with available untreated segments were selected for detailed performance and economic evaluation. In total, the performance of 50 different sites that were constructed with various treatments was evaluated for a period ranging from 4 to 18 years. Among various treatments that were analyzed, saw and seal, and chip seal as a crack relief interlayer showed the most promising results in terms of performance and economic worthiness. The cost effectiveness of fiber-glass grid was not validated as compared to regular HMA overlays. Stress absorbing membrane interlayer and high strain asphalt crack relief interlayer (STRATA®) showed mixed results in terms of performance. In addition, there were an insufficient number of projects for paving fabrics to allow for drawing conclusions on the cost-effectiveness of this treatment method.
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