Abstract
This study investigates the effect of aggregate size on the compressive strength of concrete. Two nominal mixes, that is, 1:2:4 and 1:3:6 were used in the study. Concrete cubes were produced with 6, 10, 12.5, 20 and 25 mm aggregates for the two nominal mixes and they were subjected to compressive strength test after curing for 7, 21, 28 and 56 days. It was found in the study that the strength development follows the same trend for both nominal mixes. Also, the results show that the compressive strength increases with increasing aggregate size up to 12.5 mm, while the concrete produced using 20 mm had greater compressive strength than those produced using 25 mm aggregate. This established the importance of ensuring that the right aggregate size is used in the production of concrete. Therefore, it is recommended that careful attention must be paid to the sizes of aggregates used in the production of concrete for structural purposes.
Highlights
Concrete is a blend of aggregates normally natural sand and gravel or crushed rock
The results show a clear picture of how aggregate size affects the compressive strength of the concrete
The study investigates the effects of the size of aggregate on the compressive strength of concrete
Summary
Concrete is a blend of aggregates normally natural sand and gravel or crushed rock. Concrete is sometimes referred to as artificial rock, because of its general characteristics. Aggregates, which are generally considered inert filler, account for 60 to 80 percent of the volume and 70 to 80 percent of the weight of concrete. Aggregate is considered inert filler, it is an important constituent that determines the concrete thermal and elastic properties and dimensional stability. Coarse aggregates are characteristically greater than 4.75 mm (retained on a No 4 sieve), while fine aggregate is less than 4.75 mm (passing through the No 4 sieve). The aggregate compressive strength is considered an important factor in the selection of aggregate. It is important to evaluate the effect of aggregate size on the strength of concrete
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