What is the minimum size for a core sample testing compressive strength?

When testing concrete for compressive strength, the minimum size for a core sample is specified to ensure that the sample is large enough to provide a representative and accurate measurement of the concrete's strength. The correct minimum size for a core sample is at least 3.70 inches in diameter.

Core samples taken below this size may not accurately represent the concrete due to issues such as the potential for higher variability in smaller samples and the difficulty in obtaining a uniform and consistent load distribution during testing. Specific standards and guidelines dictate these dimensions to ensure reliable test results, so using a sample that meets or exceeds the 3.70-inch diameter is essential for achieving valid compressive strength results.