Results are reported herein of a survey investigating the percentage of construction sites
that exhibit poor, fair, or good levels of peiformance for tasks that directly influence concrete
compressive strength, namely, quality of supplied concrete mix, compaction, and curing.
Using this information and existing empirical cylinder strength data, probabilistic models
have been developed to describe the variability of concrete compressive strengths within
and between buildings, if performance levels for quality of mix, compaction, and curing are …