Effect of Fineness Modulus of Sand on Compressive Strength of Concrete

Abstract

American Concrete Institure allows sand which hasfineness modulus
different from mixed design ±O.l, if its more, the engineer would make new
concrete mixed design.
This research used sand form Khon Kaen which is mixed with sand from
Nakomrachasima is more coarse. Mixed sand had fineness modulus 1.7, 19,
2.0, 2.2 and 2.4. Concrete mixed designed for compressive strength 18 N/mm2
and 28 N/mm2 and used gravel from Ubolrachatanee and Udonthanee instead
of stone. The result showed more compressive strength than designed. The
concretes which has different fineness modulus from 2.0 have compressive
strength, in maximum, 3.9 N/mm2 or 10.13% even though mixed design are
same.