Influence of Size Grading of Sand on Air Entrainment


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Title: Influence of Size Grading of Sand on Air Entrainment

Author(s): E. W. Scripture, Jr., F. B. Hornibrook and D. E. Bryant

Publication: Journal Proceedings

Volume: 45

Issue: 11

Appears on pages(s): 217-228

Keywords: no keywords

Date: 11/1/1948

Field reports indicated difficulty with certain sands in securing the deisred amount of entrained air; this was frequently attributed to the size grading of the sand, particularly to the defincency in the finer fractions. An experimental investigation was undertaken in view of the paucity of published data on this subject. Mixes of sand and water alone, 1:4 and 1:2 mortars, and concrete mixes were made with and without air-entraining agents and the air contents determined. While size grading of the sand had a very large influence on air entrainment in a mixture of sand and water alone, this effect was smaller in mortars and very small in concrete mixes. It was found that maximum air was entrained by the 28-48 mesh size sand rather than the 48-100 mesh size.