THE EFFECT OF WATER CEMENT RATIO AND AGGREGATECEMENT RATIO ON THE 28 DAYS STRENGTH OF NORMAL CONCRETE

EMMANUEL NNAMDI NWEZEH (NAU/2017224014)

Abstract


This project work investigated the effects of water cement ratio and aggregate-cement ratio on the 28 days strength of normal concrete. The investigation of this study was limited to the effect on the compressive strength and workability of concrete mix. Concrete cubes were prepared with a mix of 1:2:4, 1:11 2 :3, 1:3:6 and water-cement ratio of 0.50, 0.55, 0.60. The concrete cubes were cured for 28 days. The results showed that the workability of freshly mixed concrete increases as the water-cement ratio increases. And also the compressive strength of the hardened concrete increases as the water-cement ratio is reduced. The test result showed that the compressive strength achieved at 1:11 2 :3 concrete mix with watercement ratio of 0.55 is the highest. A higher water-cement ratio should be employed when concrete with high workability is required, having in mind that the higher the water-cement ratio the lower the compressive strength of concrete.

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