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smaller or bigger aggregate

smaller or bigger aggregate

smaller or bigger aggregate

(OP)
dear all,

i wonder why the air content is generally higher for a mix with smaller aggregates (say compared 14 mm and 10mm).  

regards,

RE: smaller or bigger aggregate

Air content is a function of the cement paste volume.  As the aggregate size decreases, the cement paste volume must increase to cover the greater aggregate surface area.

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