Quality Control Analysis. Part III. Concrete and Concrete Aggregates

摘要

This is the third and last report on the Quality Control Analysis of highway construction materials. It deals with the statistical evaluation of data from several construction projects to determine variability of 'Slump' and of aggregates. The analysis indicated (1) that the frequency distribution of most of the data tend to follow normal distribution; (2) that there is considerable variation in concrete production from batch to batch; (3) that for fine aggregate, the stockpile component of variance contributes more to the overall variance than samples within stockpile component; (4) that in the case of coarse aggregates the sample within stockpile components show larger variance than between stockpile components.