AASHTO M 45-16 (2020) PDF Download

AASHTO M 45-16 (2020) is a standard specification that outlines the requirements for aggregate used in masonry mortar. The specification is developed by the American Association of State Highway and Transportation Officials (AASHTO), and it serves as a guideline for ensuring the quality and suitability of aggregates for masonry applications.

The standard includes various criteria and tests that the aggregate must meet. This includes specific gradation requirements to ensure the proper proportioning of the aggregate in the mortar mix. It also includes limits for deleterious substances such as organic impurities, clay lumps, and chert which could adversely affect the performance of the mortar.

AASHTO M 45-16 also addresses physical requirements such as the particle shape and texture of the aggregate, ensuring that it is suitable for enhancing the workability, bond strength, and durability of the mortar. Additionally, the standard provides guidelines for sampling, testing, and reporting of the aggregate properties, ensuring consistent and reliable results.