AASHTO T 157-12 (2020) PDF Download

AASHTO T 157-12 (2020) is a standard method of testing for air-entraining admixtures used in concrete. This standard outlines the procedures and requirements for evaluating materials that are intended to be used as air-entraining admixtures in the construction industry. Air-entraining admixtures are additives that are used to introduce tiny air bubbles into concrete, improving its resistance to freeze-thaw damage.

The standard provides guidelines for conducting tests on these admixtures to determine their ability to produce the desired level of air content in concrete. It covers various testing procedures such as the pressure method, volumetric method, and specific gravity method. The results of these tests are used to assess the effectiveness and compatibility of the admixture with the concrete mixture.

AASHTO T 157-12 (2020) ensures that air-entraining admixtures meet the required specifications and performance criteria.