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This test method covers determination of compressive strength of cylindrical concrete specimens such as molded cylinders and drilled cores.
The values stated in either inch-pound or SI units are to be regarded separately as standard

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Care should be taken in interpreting the importance of compression strength determinations by this method test as force is not a fundamental or intrinsic property of concrete made from given materials.

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- Compression tests of moist-cured specimens shall be made as soon as practicable after removal from moist storage.
- Test specimens shall be kept moist by any convenient method during the period between removal from moist storage and testing.
- All test specimens for a given test age shall be broken within the permissible time tolerances prescribed as follows:

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- Testing Machine.
- Verification of calibration of the testing machines in accordance with Practices E 4.
- On original installation or relocation of the machine.
- Whenever there is reason to doubt the accuracy of the results.

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The C-31 practice provides standardized requirements for making, curing, protecting and transport of concrete test samples under field conditions, And the C-39 method is used to determine compression concentration of cylindrical specimens prepared and cured in accordance with practices C 31, C 192, C 617 and C 1231 and testing Methods C 42 and C 873

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How to Perform ASTM C 39 for Concrete Compressive Strength - Vlog 649