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Federal Highway Administration Research and Technology
Coordinating, Developing, and Delivering Highway Transportation Innovations
|This report is an archived publication and may contain dated technical, contact, and link information|
|Publication Number: FHWA-RD-97-077 Date: September 1997|
Publication Number: FHWA-RD-97-077
Date: September 1997
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A key challenge faced by engineers using the 1993 AASHTO Guide for Design of Pavement Structures (AASHTO Guide) is the selection of appropriate design values for the subgrade soil and for the pavement materials. Until now, the information available to help engineers choose appropriate values has been incomplete. This design pamphlet addresses this problem by presenting procedures for selecting appropriate design values to characterize the pavement materials. Two companion pamphlets—Design Pamphlet for the Determination of Design Subgrade Moduli in Support of the 1993 AASHTO Guide for the Design of Pavement Structures (FHWA-RD-97-083) and Design Pamphlet for the Back-calculation of Pavement Layer Moduli in Support of the 1993 AASHTO Guide for the Design of Pavement Structures (FHWA-RD-97- 076)--provide additional, related guidance on interpretation of pavement deflection data and characterization of the subgrade soil. The procedures presented were developed through analysis of the Long-Term Pavement Performance (LTPP) data, documented in the report Analyses Relating to Pavement Material Characterization and Their Effects on Pavement Performance, FHWA-RD-97-085.
Application of the procedures and guidelines developed through this analysis will facilitate and improve application of the AASHTO Guide flexible pavement design procedures. Their use will provide: (1) improved designs, (2) more realistic estimates of pavement performance, and (3) more consistent use of the AASHTO design parameters. Furthermore, although the procedures are specifically developed for use with the 1993 AASHTO Guide, their use will give agencies a "leg up" on implementation of the design procedures being developed for inclusion in the 2002 AASHTO Guide for Design of New and Rehabilitated Pavement Structures. Thus, this pamphlet and its companions are critically important to anyone who designs flexible pavements.
Charles J. Nemmers, P.E.
Office of Engineering
Research and Development
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