Preface

The Joint Task Force on Pavements-composed of members from the Highway Subcommittee on Design, one member each from the Highway Subcommittees on Materials, Construction, and Maintenance, and one from the Standing Committee on Planning-has developed this Supplement to the AASHTO Guide for the Design of Pavement Structures. This Supplement includes alternative design procedures that can be used in place of or in conjunction with Part II, Section 3.2 "Rigid Pavement Design" and Section 3.3 "Rigid Pavement Joint Design."

The development of these alternative design procedures began with AASHTO's NCHRP Project 1-30. This project was to utilize new data available as a result of the LTPP database to incorporate new data on loss-of-support for use in the design of rigid pavements and overlays and to improve the selection of k values. The document was then validated and revised under an FHWA contract and then finally developed into design procedures for use by AASHTO. These alternative design procedures and a "Rigid Pavement Design Example" are included herein for those who would like to make use of the LTPP data in rigid pavement design.

This supplement has been ballotted and approved for publication by AASHTO's Standing Committee on Highways.