AASHTO HM: 2025 [pdf]

AASHTO HM-45 – Standard Specifications for Transportation Materials and Methods of Sampling and Testing, and AASHTO Provisional Standards, 45th Edition, 2025

Includes Errata 2025 & 2026 (Sept. 2025, October 2025, Nov. 2025, March 2026, June 2026)

It contains specifications, recommended practices, and test methods commonly used in the construction of highway facilities. Provisional standards are also published to allow practitioners to use them early in the research or development phase.

This 2025 edition of the Materials Standards contains a total of 583 standards, including 20 new and 103 revised standards. In addition to revisions to harmonize industry standards, update technology, and improve the standards, this edition includes conversions to dual units, as well as several important updates:

• Better defining coal ash used on concrete;
• More clearly defining blended cements alkali loading;
• Clearer requirements for both making and storing concrete test specimens;
• Improvements to the pipe standards; and
• Clarifications to the binder content of asphalt mixtures by nuclear method.

In addition, the standards include:

• 12 new provisional practices and tests related to pavement measurement and pavement preservation; new dowel bar material and test standards; and a new ice melting capacity test method;
• 12 provisional standards that were adopted as full standards;
• Three new standards related to quality assurance: One for concrete, one for cold central plant recycling, and one for cold in-place recycling; and
• Two new test methods related to asphalt: A new liquid asphalt test method, called the poker chip test, and a new balanced mix design for high RAP asphalt test method.

This product is a collection of four downloadable PDF files. Download all four PDFs for the complete set of standards. The various errata are incorporated into the PDFs.

AASHTO HM-45, 9781560518563