Standard test method for density, absorption and voids in hardened concrete / 
ASTM International 
 - 1 online resource 
 - C642-21 .
 - C642-21 .
<br/><br/>Includes bibliographical references 
<br/><br/><label>ISBN: </label>ASTM C642-21 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Concrete--Density<br/>Concrete--Testing