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Effect of Aggregate Size Distribution on Concrete Compressive Strength

Corresponding Author : M. B. Haque (bashir-cee@sust.edu)

Authors : I. A. Tuhin , M.S.S. Farid

Keywords : Grading, Fineness Modulus, Aggregate, Compressive Strength, Mix Ratio

Abstract :

Effects of size distribution of both fine and coarse aggregate and maximum coarse aggregate size on concrete compressive strength were analyzed. Other variables like water cement ratio, aggregate cement ratios were kept constant and only 28 days compressive strength was measured to evaluate the result. Mixtures of Sylhet sand and local sand were used as fine aggregate and stone chips were used as coarse aggregate. Twelve set of cylinders were crushed with different combination of fine aggregate having fineness modulus of 2.0, 2.5 and 3.0 and coarse aggregate having fineness modulus of 6.0, 6.5, 7.0 and 7.5. Maximum size of coarse aggregates was 1.5 inch. From this study it was observed that compressive strength of concrete increases with the increase of the fineness modulus of both fine and coarse aggregate. Maximum compressive strength was found 3.87 ksi for concrete having fineness modulus for fine and coarse aggregate as 3.0 and 7.5 respectively with mix ratio 1:2:4. Compressive strength of concrete increases up to the maximum aggregate size of 1.5 inch. It was also found that compressive strength has no linear relationship with the combine fineness modulus of aggregate. 

Published on December 30th, 2012 in Volume 19, Issue 2, Applied Sciences and Technology