Vol. 6, Issue 1 (2020)
This study explored the influence of aggregate size and curing time on the compressive strength of concrete. The coarse aggregates were sieved to a particle size of 19 mm, 13.2 mm, 9.5 mm, and 6.7 mm, while the fine aggregate was sieved to an average size of 2mm. Different concrete formulations of dimensions 100 mm x 100 mm x 100 mm were prepared using cement, fine aggregates, and coarse aggregates in a nominal mix ratio of 1:2:4 with a water-cement ratio of 0.6. Three cubes were cast for each aggregate size and cured for 7 days, 14 days, 21 days, and 28 days respectively. The compressive strength of the prepared concretes was measured. The experimental results demonstrated the dependence of compressive strength of concretes on the aggregate size and curing time. Results revealed at each curing time, the compressive strength of the concrete increased with increasing aggregate size up to 13.2 mm size and decreased with further increase in aggregate size (from 13.2 mm to 19 mm). The compressive strength of the concrete containing an aggregate of 13.2 mm size increased by about 46.84% as the curing time increased from 7 days to 28 days. With increasing curing time at different aggregate sizes, the compressive strength increased correspondingly. The average weight of the concrete samples decreased with increasing curing time.
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