详情

原文传递 THE MEASURED RESPONSE OF ULTRA-THIN AND THIN WHITETOPPING TO ENVIRONMENTAL LOADS.

题名：	THE MEASURED RESPONSE OF ULTRA-THIN AND THIN WHITETOPPING TO ENVIRONMENTAL LOADS.
作者：	Vandenbossche-JM
关键词：	Asphalt-concrete-pavements; Deformation-; Environmental-engineering; Loads-; Minnesota-; Moisture-content; Pavements-; Sensors-; Slabs-; Static-and-dynamic-tests; Thinness-; Whitetopping-
摘要：	This paper discusses how the technique of whitetopping asphalt concrete pavements with a thin (102-mm to 152-mm thick) or ultra-thin (51-mm to 102-mm) thick concrete overlay is becoming more common. This increase in use of thin whitetopping (TW) and ultra-thin whitetopping (UTW) has amplified the need for a comprehensive design procedure. The objective of this paper is to develop a better understanding of the behavior of thin and ultra-thin whitetopping by measuring the responses of the pavements to various environmental loadings. A 345-mm asphalt concrete pavement on I-94, at the Minnesota Road Research (Mn/ROAD) facility was whitetopped with a fiber-reinforced concrete overlay in October 1997. The experimental design features six test cells with various thicknesses, joint patterns and types of fibers. Each cell is instrumented with dynamic and static strain, temperature and moisture sensors. Temperature, moisture and static strain data have been collected continuously since construction. Strain gages were used to measure the effects of moisture and temperature changes in the pavement. An evaluation of the data over time indicates seasonal changes occur in the quality of bond between layers, which has implications for changes in load-related stress over time. Both thermal and moisture changes in the overlay have a significant effect on the shape of the slab. Strain measurements revealed the complexity of the relationship between changes in temperature and/or moisture and slab deformation. This relationship must be clearly defined before an analysis of the response of the overlay to an applied load can begin.
总页数：	Conference Title: Seventh International Conference on Concrete Pavements. The Use of Concrete in Developing Long-Lasting Pavement Solutions for the 21st Century. Location: Orlando, Florida. Sponsored by: International Society of Concrete Pavements. Hel
报告类型：	科技报告