What does ASTM C39 cover?

ASTM C39 specifically addresses the standard test method for measuring the compressive strength of cylindrical concrete specimens, such as concrete cylinders. This test is critical for determining the strength characteristics of concrete, which is a key property when assessing its structural integrity and performance under load.

The test may involve preparing cylindrical specimens by casting concrete into designated molds, curing them appropriately, and then subjecting them to a compressive load until failure in a controlled setting. The results of this test provide essential data for engineers and construction professionals to ensure that concrete used in construction meets the specified strength requirements, which is vital for safety and durability.

The other options relate to different aspects of concrete, such as mix design, workability, and curing, but they do not pertain directly to the compressive strength testing outlined in ASTM C39. This distinction makes understanding ASTM C39 crucial for any professional involved in concrete testing and quality assurance.