The new AASHTO guide for design of pavement structures (1986) is evaluated using theory and field performance data. Jointed plain (JPCP) and jointed reinforced (JRCP) concrete pavements are considered. The conceptual evaluation considers the assumptions, capabilities, and theoretical limitations of the AASHTO guide. The analytical field data evaluation includes two approaches: predicted vs. Actual ESALs for in-service pavements from NCHRP project 1-19, and the specific design evaluation. Four broad zones in the united states were used to characterise the performance of the AASHTO designs in different climates. This dual approach to design procedure evaluation provides an overall picture of the capabilities of the new AASHTO guide. Deficiencies are identified that must be considered by agencies implementing the new AASHTO guide, and recommendations on how to overcome these deficiencies are provided.
Abstract