详情

原文传递 Thin and Ultra-Thin Whitetopping. A Synthesis of Highway Practice.

题名：	Thin and Ultra-Thin Whitetopping. A Synthesis of Highway Practice.
作者：	RASMUSSEN, R. O.; ROZYCKI, D. K.
关键词：	Pavement-overlays; Fiber-reinforced-concrete; *Highway-construction.;Coverings-; Coldmilling-; Pavement-rehabilitation; Project-selection; Design-; Construction-practices; Performance-; Repairs-; Research-needs.
摘要：	The purpose of this synthesis is to summarize available information and to document how departments of transportation and other agencies and owners are currently using thin whitetopping (TWT) and ultra-thin whitetopping (UTW) overlays among their various pavement rehabilitation alternatives. Although TWT and UTW overlays have been constructed for decades, their recent popularity is largely the result of a renewed demand for longer-lasting but cost-effective solutions for hot-mix asphalt (HMA) pavement rehabilitation. A whitetopping overlay is constructed when a new portland cement concrete layer is placed on top of an existing HMA pavement system. The concrete thickness for a UTW is equal to or less than 100 mm (4 in.). A TWT is greater than 100 mm (4 in.) but less than 200 mm (8 in.). Conventional whitetopping is an overlay of 200 mm (8 in.) or more. In most cases, a bond between the new concrete and existing HMA layers is not only assumed during design, but specific measures are taken to ensure such a bond during construction. The success of this bond, leading to composite action, has been found to be critical to the successful performance of this pavement-resurfacing alternative.
报告类型：	科技报告