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原文传递 Update of Condition Rating Survey (CRS) Calculation/Prediction Models, Phase 3: CRS Prediction Model Development.

题名：	Update of Condition Rating Survey (CRS) Calculation/Prediction Models, Phase 3: CRS Prediction Model Development.
作者：	heckel, l. b. ouyang, y.
关键词：	calculation models, illinois, surface types, surveys, graphs (charts), model development, severities, digital images, distresses, computer software
摘要：	The Illinois Department of Transportation (IDOT) determines a Condition Rating Survey (CRS) value for each roadway section using CRS calculation models. After the rating values have been determined, IDOT uses prediction models to estimate the condition of the pavements in the future. The objective of Phase 3 was to revise the existing prediction models and develop new models for pavement types that currently have none. Models were created or revised for 28 pavement types. Both D-cracking and the use of SMART (thin overlays) are known to reduce the expected life of pavements. Therefore, D-cracking and SMART models were created whenever possible. / NOTE: Interim proj. rept. / Supplementary Notes: See also PB2008-113461 and PB2008-113463. Prepared in cooperation with Illinois Univ. at Urbana-Champaign, Illinois Center for Transportation. Sponsored by Illinois State Dept. of Transportation, Springfield. and Federal Highway Administration, Washington, DC. / Availability Note: Available on CD-ROM and in color paper copy only. 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：	u0824；82p
报告类型：	科技报告