Guide Specifications for Highway Construction
|Publication Date:||1 January 2008|
This is the ninth edition of the AASHTO Guide Specifications for Highway Construction. These specifications have been developed by the AASHTO Subcommittee on Construction and are intended to complement the specifications for major structures and bridges, which are covered by the AASHTO LRFD Bridge Construction Specifications.
This edition includes four significant changes to these guide specifications. First, in order to reinforce and clarify the meanings of terms for readers, uniform terminology is used consistently throughout the specifications. Secondly, elimination of redundant language results in the deletion of some sections and an increased number of cross-references among the remaining sections. Also, the AASHTO and ASTM references within the guide specifications have been updated. Finally, this edition of the guide specifications includes several new sections-Sections 312 through 315 address additional base course options; Sections 716 through 718 address materials requirements for aluminum, timber, and ground anchors; and Appendixes A and B provide sample technical provisions and considerations for use with innovative contracting methods and pavement ride quality measurement.
The many differences in climate, geology, geography, customs, statutes, and regulations make a national construction specification practically impossible. However, to provide for easier crossreferencing from state to state or with other agencies, this guide provides uniformity of nomenclature, format, methods of measurement, basis of payment, and method of tests. The guide specifications provide the specification writer with information and topics to be covered and expounded on in a detailed project construction specification.
The guide specifications divisions are subdivided into Description, Materials, Construction Requirements, Method of Measurement, and Basis of Payment. Items shown in brackets, such as , throughout the guide specifications are suggested values and should be changed, when necessary, to meet the requirements of the various agencies or project conditions.
Some sections of the guide specifications may be written in a manner to appear as absolute and definite. This is not intended to be the only approach to the content of the section, but to provide a detailed example of the topic.
AASHTO guide specifications are updated and republished periodically. The updated versions provide the user with products, systems, and specification topics that have been used since the last edition.