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Abstract:The rapid increase in the use of lightweight aggregates in structural concrete has created a number of problems for the Materials Engineer in evaluating this type aggregate. Exhaustive studies are being made of a number of properties of lightweight aggregates.
The Los Angeles abrasion test, ASTM Methods: C 131, does not make any provision for t he density of aggregates in that it requires a certain sample size, by weight, regardless of the weight-volume relationship of the material. Consequently, when the aggregate is lighter, the resulting volume charged into the drum is larger. With very light aggregates, this may affect the results, due to the cushioning effect of the additional volume, giving an eroneous lower abrasion loss.
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