Extensive statistical analysis of the variability of concrete rebound hardness based on a large database of 60years experience.

Highlights: [•] Repeatability of rebound hammer test depends on type of cement, w/c-ratio and age. [•] Repeatability parameter distributions have positive skewness for rebound hammer test. [•] Rebound index coefficient of variation cannot estimate that of compressive strength. [•] Repeatability and precision claims (ACI 228.1R-03; ASTM C 805) need reconsideration. [•] Basic curve and assessment method of EN 13791 need reconsideration for rebound test. [ABSTRACT FROM AUTHOR]