Watch this video about the unit weight of concrete test, or ASTM C138 - Density (Unit Weight), Yield, and Air Content (Gravimetric) of Concrete.

The aim of ILO Convention No. 138 on Minimum Age (C138) is the effective abolition of child labour – which is work that is hazardous to children’s health, safety or morals, work that interferes with …

Aug 22, 2023 · AbstractThis test method covers determination of the density of freshly mixed concrete and gives formulas for calculating the unit weight, yield or relative yield, cement content, and air …

Overview of ASTM C138 - Standard Test Method for Density (Unit Weight), Yield, and Air Content (Gravimetric) of Concrete. This is a test required to pass the American Concrete Institute (ACI)...

WJE laboratories are accredited by AASHTO (R18) and ANAB (ISO/IEC 17025) to perform testing standard ASTM C138 for Density (Unit Weight), Yield, and Air Content (Gravimetric) of Concrete.

Sep 15, 2023 · NOTE 4—A rod length of 400 mm [16 in.] to 600 mm [24 in.] meets the requirements of the following: Practice C31/C31M, Test Method C138/ C138M, Test Method C143/C143M, Test …

ASTM C138 – Standard Test Method for Density (Unit Weight), Yield, and Air Content (Gravimetric) of Concrete. ASTM C138 outlines procedures to determine the following properties of freshly mixed …

1.1 This test method covers determination of the density (see Note 1) of freshly mixed concrete and gives formulas for calculating the yield, cement content, and air content of the concrete. Yield is …

Oct 4, 2025 · STANDARDS, PRACTICES and MANUALS ON ASTM C138 View all Documents on astm c138 »

This standard is issued under the fixed designation C138/C138M; the number immediately following the designation indicates the year of original adoption or, in the case of revision, the year of last revision.