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原文传递 Bond Characteristics of Overlays Placed over Bridge Decks Sealed with HMWM or Epoxy; Final rept

题名：	Bond Characteristics of Overlays Placed over Bridge Decks Sealed with HMWM or Epoxy; Final rept
作者：	Shahrooz, B. M.; Gillum, A. J.; Cole, J.; Turer, A.
关键词：	Pavement overlays; Bridge decks; Epoxy resins; Concretes; Bonding; Deterioration; Portland cements; Shear tests; Cyclic loads; Beams(Supports)
摘要：	The reported research examines the bond strength between overlays placed over bridge decks which are sealed with epoxy resin or high molecular weight methacrylate (HMWM) sealers. The study involved field and laboraotry experimental testing of cores under direct shear, SHRP interfacial specimens, beams, and a 1/3-scale bridge subassembly of a typical steel stringer bridge. Micro-silica modified concrete, latex modified concrete, and superplasticized dense concrete overlays were used in this study. The experimental data were complemented with finite element studies. Despite often stark variations in the values of bond strength obtained from different testing methods, the data universally suggest that the use of a sealer at the interface can reduce the available bond strength. The level of the strength reduction depends on the type of sealer, but the bond strength can drop by as much as 50%. Extra surface preparation techniques, such as light sandblasting of the surface after applying the sealer or broadcasting sand over the sealed interface while the sealer is curing, are effective in restoring the bond strength.
总页数：	206p
报告类型：	科技报告