United States Department of Transportation
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Paving fabrics for reducing reflective cracking
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1991-11-01
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[PDF-5.15 MB]
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Edition:Final report
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NTL Classification:NTL-HIGHWAY/ROAD TRANSPORTATION-Pavement Management and Performance;NTL-HIGHWAY/ROAD TRANSPORTATION-Construction and Maintenance;NTL-HIGHWAY/ROAD TRANSPORTATION-Materials;
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Abstract:This research effort was part of ADOT's New Product Evaluation Program. The objective was to evaluate the construction and field performances of three commercially available paving fabrics; Paveprep, Glassgrid, and Tapecoat. The fabrics were designed to prevent or mitigate the propagation of reflective cracks through asphalt concrete overlays. The experiment involved installing each of the fabrics onto eight full length transverse cracks along SR 186 in Willcox Arizona. Eight cracks were left untreated to be used as a control. After placement of the fabrics, the existing pavement was then given a 2-in. HMAC overlay. The locations of the original cracks were monitored for three years. In addition to the localized paving fabric, Travira Spunbound pavement reinforcing fabric was installed at full roadway length at the same time for a half-mile section just east of the experimental project. Although the Travira was not part of the experimental project, it's performance was also monitored. The installation of the three paving fabrics was troublesome. The problems were primarily related to the fabrics' bond with the existing pavement. All of the fabrics had trouble developing a proper bond, and at times would pick up beneath the tires of the construction vehicles. At the end of the evaluation period statistical analyses were conducted on the performance of the paving fabrics, relative to each other and to the untreated control cracks. The analyses showed no significant difference in the treated cracks or the control cracks. Core samples were obtained to confirm the fabric had stayed in place and that the cracks had propagated through them. The fabrics were not visibly distressed. Results of the evaluations led to the conclusion that these paving fabrics; Paveprep, Glassgrid, and Tapecoat, were ineffective at preventing or mitigating reflective cracking at the project location. Paving fabrics are not recommended for future use on pavements with widely spaced transverse cracks. Recommendations for future investigations or use of paving fabrics include determining a means of insuring a proper bond of the fabrics with the milled original pavement. /Abstract from report summary page/
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