ASTM C39/C39M-20 pdf free.The title is Standard Test Method for Compressive Strength of Cylindrical Concrete Specimens. ASTM C39/C39M covers determination of compressive strength of cylindrical concrete specimens such as molded cylinders and drilled cores. It is limited to concrete having a density in excess of 800 kg/m3 . 3. Terminology 3.1 Definitions—For definitions of terms used in this prncticc, refer to...