Transcription of SECTION 500.00 – PAVEMENT DESIGN
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SECTION 500.00 – PAVEMENT DESIGN
MATERIALS PAVEMENT DESIGN 175 SECTION PAVEMENT DESIGN SECTION THICKNESS DESIGN FOR FLEXIBLE PAVEMENT The DESIGN procedure described herein is based on methods developed by the California Department of Transportation (Caltrans), which have been modified to accommodate Idaho conditions. Minimum DESIGN standards are based on recommendations of Caltrans, AASHTO, The Asphalt Institute, and local experience. Summary of DESIGN Factors. 1. Traffic - Expressed in terms of Traffic Index (TI) for the DESIGN period (generally 20 years) and determined as follows: State Highway Routes (On-System) - use the estimate of accumulated 8000 kg (18 kip) Equivalent Single Axle Loads (ESALs) to compute the Traffic Index directly by formula; Off-System Routes - use the estimate of current and future ADT and commercial volume percentage to compute the commercial ADT (CADT).
4. Stiffness - Expressed in terms of the Substitution Ratio (Gf) is used to adjust the thickness of the individual pavement layers in consideration of the cohesive strength of the binder materials, relative stiffness of unbound layers and drainage capability. 5. Economics - Design the structural cross section necessary to accommodate the estimated
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