Aggregate Grading Affects Air Entrainment

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Title: Aggregate Grading Affects Air Entrainment

Author(s): B. G. Singh

Publication: Journal Proceedings

Volume: 55

Issue: 1

Appears on pages(s): 803-810

Keywords: no keywords

Date: 1/1/1959

Abstract:
Both plain and air-entrained concretes were made with aggregate of constant specific surface whose grading was varied while other mix proportions were held constant. Mixes made with a given aggregate grading which entrained more air under natural conditions (no air-entraining agent) also entrained proportionately more air with an air-entraining admixture. Relative effect of the different size fractions of aggregate on air entrainment are evaluated, assigning the greatest weight to material passing the No. 25 and retained on the No. 52 sieve. Reduction in sand content or increasing its fineness both tend to decrease air entrainment potential.