AASHTO T 121M/T 121-19 PDF Download

AASHTO T 121M/T 121-19 is a standard method of testing the density (unit weight), yield, and air content of concrete. It provides guidelines for determining the density of freshly mixed concrete as well as formulas for calculating the yield, cement content, and air content of the concrete. The yield refers to the volume of concrete produced from a specific mixture of component materials. This standard is applicable to plastic concrete mixes commonly used in various applications except for nonplastic concrete like those used in pipe and unit masonry manufacturing. The test method outlined in this standard ensures that concrete meets specific density requirements and allows for the accurate assessment of the air content, which is crucial for determining the durability and workability of the concrete mixture.