How does the compressive strength of a drilled core compare to that of properly molded samples?

When comparing the compressive strength of a drilled core to that of properly molded samples, it is understood that drilled cores tend to exhibit less strength. Several factors contribute to this difference in strength.

Drilled cores are typically extracted from existing concrete structures and may experience issues such as inhomogeneity due to variations in material properties, curing conditions, and potential environmental impacts that affected the concrete over time. In contrast, properly molded samples are produced under controlled conditions that ensure uniformity and consistency, typically following standardized curing and preparation processes.

The molding process allows for the concrete to set evenly and have fewer defects, leading to higher and more reliable compressive strength values. Additionally, the age of the structure from which the core is taken may also affect its strength if it has experienced deterioration or damage.

Due to these reasons, it is acknowledged that the compressive strength of drilled cores is generally less than that of properly molded samples, making the selected answer appropriate in this context.