Which factor can affect the results of a compressive strength test?

The age of the concrete specimen is a critical factor that can significantly affect the results of a compressive strength test. Concrete gains strength over time as it continues to cure, and its compressive strength is generally measured at specific time intervals, such as 7 days, 14 days, or 28 days after casting.

When testing concrete, the age of the specimen provides insight into its development of strength due to hydration processes. Younger concrete may not have reached its full potential strength and could yield lower test results compared to specimens assessed at optimal curing ages. Therefore, understanding the age at the time of testing is crucial for accurately interpreting the results and determining if the concrete meets the specified strength requirements for structural applications.

The other factors listed do not have a scientifically established correlation to directly influencing the compressive strength results in a meaningful or measurable way.