United States Department of Transportation
i
TRC-0209: Improvements to the ROADHOG Overlay Design Program - Final Report
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2004-05-01
[PDF-2.07 MB]
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Abstract:The ROADHOG overlay design system and associated computer program has been used by the Arkansas State Highway and Transportation Department {AHTD} for the design of flexible pavement overlays. The program is based on the results of research conducted for AHTD and has been through two modifications since its original inception. While the technical aspects of the program continued to meet expectations, the program itself needed updating. AHTD acquired a new falling weight deflectometer (FWD) in the 1990s, which uses a file format that is not compatible with the original version of ROADHOG. In addition, the original ROADHOG software was written in a DOS-based computer language that would not run consistently on Windows-based personal computers. Finally, a revision could provide additional features to assist designers with overlay designs and provide researchers en opportunity to re-investigate some of the basic relationships underlying the computational algorithms contained in ROADHOG. The two primary global objectives for the proposed research included completely upgrading the existing ROADHOG computer program into an Excel based, interactive system; the second involved incorporating identified improvements to the existing ROADHOG system. In general, all project objectives were met. The ROADHOG system was programmed into Microsoft"' EXCEL® for ease of use. A new, more streamlined equation was developed for estimating the effective structural number of an existing flexible pavement, The sensitivity of ROADHOG to the (required) input of existing pavement thickness was evaluated; it appears that a one-Inch difference in input existing pavement thickness results in a difference in recommended overlay thickness ranging from 0.05 to 0.2 inches. Comparisons to the ELMOD system Indicated that ROADHOG continues to provide reasonable overlay thicknesses comparable to those provided by the ELMOD "basin fit" procedure. A user's guide for ROADHOG was developed to aid designers in using the Excel based system.
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Content Notes:Conducted in cooperation with U.S, Department of Transportation, Federal Highway Administration
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