ASTM C 138/C 138M - 10a Standard Test Method for Density (Unit Weight), Yield, and Air Content (Gravimetric) of Concrete

American Society for Testing and Materials (ASTM). Current edition approved July 1, 2010. Published August 2010. 4 p. This test method covers determination of the density of freshly mixed concrete and gives formulas for calculating the yield, cement content, and air content of the concrete. Yield is defined as the volume of concrete produced from a mixture of known quantities of the component materials.