AASHTO T 121M/T 121-09 Download


Standard Method of Test for Density (Unit Weight), Yield, and Air Content (Gravimetric) of Concrete (ASTM Designation: C 138/C 138M-08)
standard by American Association of State and Highway Transportation Officials, 01/01/2009



This method covers determination of the density (see Note 1) of freshly mixed concrete and givesformulas for calculating the yield, cement content, and the air content of the concrete. Yield isdefined as the volume of concrete produced from a mixture of known quantities of the componentmaterials.

The values stated in either SI or inch-pound units shall be regarded separately as standard. Theinch-pound units are shown in brackets. The values stated might not be exact equivalents;therefore, each system must be used independently of the other.

Note 1–Unit weight was the previous terminology used to describe the property determined bythis test method, which is mass per unit volume.

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