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原文传递 Seasonal Variations of In situ Materials Properties in New York State.

题名：	Seasonal Variations of In situ Materials Properties in New York State.
作者：	irwin, l. h. orr, d. p.
关键词：	models, falling weight deflectometer, seasonal variations
摘要：	In 2001, NYSDOT solicited proposals for research on development of seasonal models for the in situ characteristics of pavement materials to help them implement the new mechanistic-empirical pavement design guide being developed by the National Cooperative Highway Research Program (NCHRP). The Cornell University Local Roads Program worked with NYSDOT and a technical advisory committee to meet the needs of the proposal. The models used in most pavement designs fail to take into account the spatial and seasonal stochastic variations that exist in real world situations. In order to provide NYSDOT with the most practical models possible, the experimental plan called for a large number of Falling Weight Deflectometer (FWD) tests over a single year. The collected data were used to determine seasonal and spatial variations at four sites in New York State. By analyzing the variables between the sites, a combined model of seasonal pavement variation was developed. The concept of practical evaluation tests and the limited budget led to the development of an initial experimental design influenced by economic considerations and practical time constraints. Tests currently performed by NYSDOT were preferred. Since NYSDOT owned an FWD, FWD testing was preferred over expensive laboratory tests which are unlikely to be used in typical pavement design analyses. Since an FWD tests in situ conditions, the results could be used to define the spatial and temporal variations in pavement response for a particular site. / NOTE: Final research rept. / Supplementary Notes: Sponsored by New York State Dept. of Transportation, Albany. / Availability Note: Order this product from NTIS by: phone at 1-800-553-NTIS (U.S. customers); (703)605-6000 (other countries); fax at (703)605-6900; and email at orders@ntis.gov. NTIS is located at 5285 Port Royal Road, Springfield, VA, 22161, USA.
总页数：	u0801；282p
报告类型：	科技报告