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Alternative Title:Quality control analysis : part III : concrete & concrete aggregates : Louisiana highway research.
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Abstract: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 the basic pattern of variability with respect to slump of concrete and concrete aggregates.
The analysis indicated 1) that the frequency distribution of most of the data tend to follow normal distribution; 2) that, in general there is considerable variation in concrete projection from batch to batch; 3) that for fine aggregate, the stockpile component of variance (as determined by ANOVA) contributes more to the overall variance than samples within stockpile component; 4) that in the case of coarse aggregates, the samples within stockpile component show larger of variance than between stockpile component; 5) furthermore, that there is pronounced variation in pavement thickness from contractor to contractor.
The analysis of data on asphaltic concrete characteristics indicated 1) that there is considerable variation in pavement density from contractor to contractor; 2) that by far the largest source of variation in discharge temperature is indicated by process component.
The study has also revealed how control charts can be used for control and acceptance of Portland cement concrete production.
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