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- W650982135 abstract "The Arkansas State Highway and Transportation Department (AHTD) designs flexible pavement overlays using ROADHOG, a pavement deflection based procedure developed by the University of Arkansas. ROADHOG is based on overlay design concepts contained in the 1986 AASHTO Guide. Publication of a discreet overlay design procedure in the 1993 edition of the AASHTO Guide prompted a re-evaluation of the ROADHOG procedure in light of the AASHTO procedure. Since both procedures are based somewhat on pavement surface deflections, deflection basins were generated using ILLI-PAVE (finite element) and ELSYM5 (elastic layer) pavement models. The basins represented a wide variety of pavement layer thicknesses and modulus values. Both ROADHOG and AASHTO were used to design overlays based on the deflection basins. The results showed ROADHOG and AASHTO requiring different overlay thicknesses. The differences were traced to differences in estimates for both the effective structural number of the existing pavement (SN sub eff) and the structural number required for new pavement (SN sub f). The analyses also showed the AASHTO procedure to be much more sensitive to the estimate for subgrade resilient modulus backcalculated from deflection data. Using input values of subgrade modulus and values of SN sub eff calculated using a layer component analysis, the comparison showed ROADHOG to provide estimates of subgrade modulus and SN sub eff that seem to be more reasonable than those from AASHTO. It was recommended the Arkansas Highway Department continue use of ROADHOG for routine overlay design." @default.
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- W650982135 date "1997-06-01" @default.
- W650982135 modified "2023-09-27" @default.
- W650982135 title "Reliability and Design Procedure Revisions of ROADHOG" @default.
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