AASHTO T 137-21 PDF Download

The AASHTO T 137-21 standard is titled "Standard Method of Test for Air Content of Hydraulic Cement Mortar". This method is used to determine the air content in hydraulic cement mortar under specific conditions.

The standard identifies the procedure for conducting the test, which involves preparing a sample of the mortar and subjecting it to a series of measurements. It provides guidelines on the equipment and materials required for the test, as well as the steps to be followed in conducting the procedure.

The purpose of determining the air content in hydraulic cement mortar is to ensure the quality and performance of the mortar in various construction applications. The presence of the correct amount of air in the mortar helps prevent cracking, improve workability, and enhance resistance to freeze-thaw cycles.