United States Department of Transportation
i
Monitoring and Evaluation of Thin Bonded Overlays and Surface Laminates for Bridge Decks
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1997-08-01
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[PDF-10.88 MB]
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TRIS Online Accession Number:745715
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Abstract:This study, part of a larger national effort to research thin bonded overlays for bridge decks, investigated the relative performance and costs of various technologies used for thin overlays on concrete bridge decks. This element of the program considered four different overlay treatments applied to a total of 13 bridges along Interstate 90 in southwestern Montana. The overlay technologies considered consisted of two Portland cement related products, an acrylic polymer modified, cement-based topping (Thorotop HCR) and silica fume concrete; and two resin/aggregate systems, one with an epoxy binder (Flexolith 216) and one with a methyl methacrylate (MMA) binder (Degadur 330BD). Extensive documentation was collected on the pre-overlay condition of the decks, the overlay installation processes, the initial condition of the overlays, and the condition of the overlays after one or two winter(s) of service. The Flexolith 216 and Degadur overlays exhibit limited cracking, but no significant delaminations or dramatic loss of surface roughness, after two years of service. The Thorotop HCR overlays have worn off in heavily trafficked areas of the decks on one set of bridges. Concerns have also developed regarding the skid resistance of the Thorotop overlays. The silica fume concrete overlay, in service for only one year, exhibits few signs of distress. Regarding costs, bid prices for the Thorotop HCR, silica fume, Flexolith 216, and Degadur overlays were $22, $40, $36, and $44 per sq yd (0.836 sq m) of surface area, respectively. Comparing life cycle costs of these various deck treatments, however, is difficult, in that not enough time has gone by in most cases for clear differences to emerge in the long term performance between overlay treatments.
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