EFFECTS OF DIFFERENT SIZE OF COARSE AGGREGATE ON THE COMPRESSIVE STRENGTH OF CONCRETE

VIVIAN CHISOM MUONEKE (NAU/2016224045)

Abstract


Coarse aggregates, which is the interest of this study, make the difference. Three different types of coarse aggregates, with 20mm maximum size, employed in this investigation, these are; 12mm, 16mm, and 20mm. The grading and compressive strength of the aggregates were studied. The mix ratio and water/cement ratio adopted for the study was 1:2:4 and 0.55 respectively. Two concrete cubes (150mm x 150mm x 150mm) were cast for eachcoarse aggregate type of which two were crushed at each curing age namely; 7, 14, 21, and 28 days. The 28 day strengths of the concretes made with 20mm, 16mm, and 12mm were 26.20N/mm2 , 24.02N/mm2 , and 22.03N/mm2 respectively, The 21 day strengths of the concretes made with 20mm, 16mm, and 12mm were 23.23N/mm2 , 21.85N/mm2 , and 18.17N/mm2 respectively, The 14 day strengths of the concretes made with 20mm, 16mm, and 12mm were 21.24N/mm2 , 20.03N/mm2 , and 17.47N/mm2 respectively and The 7 day strengths of the concretesmade with 20mm, 16mm, and 12mm were 19.34N/mm2 , 17.55N/mm2 , and 15.53N/mm2 respectively. Therefore, result shows that as the aggregate size increases, the compressive strengthincreases also with increasing curing days.

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