Department of Physics

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    Compressive strength of concrete produced using aggregates from selected types of rocks in Uganda
    (Kyambogo university (Unpublished work), 2024-05) Kawiso, Micah
    This study was on determining the compressive strength of concrete made of granite, quartzite and sandstone aggregates of three aggregate sizes of 6.3 mm, 10 mm, and 14 mm and using three cement, sand and aggregate mixture ratios of 1:3:6, 1:2:4, and 1:1:2. This was to find out the effects of mixture ratios, aggregate sizes and aggregate types on compressive strength of the concrete. The samples of concrete were cured for 14 days and then a compression test machine was used to determine the compressive strength of the samples. The average compressive strength of granite concrete of mixture ratios 1:3:6, 1:2:4 and 1:1:2 were 8.56, 19.10 and 32.59 MPa respectively. The mean compressive strength of quartzite concrete of mixture ratios 1:3:6, 1:2:4 and 1:1:2 were 8.78, 17.57 and 31.22 MPa respectively. The average compressive strength of sandstone concrete of mixture ratios 1:3:6, 1:2:4 and 1:1:2 were 9.71, 20.75 and 33.58 MPa respectively. The mean compressive strength of granite concrete of aggregate sizes 6.3, 10, and 14 mm were 18.77, 19.62, and 21.87 MPa respectively. The mean compressive strength of quartzite concrete of aggregate sizes 6.3, 10, and 14 mm were 17.93, 18.95, 20.71 MPa respectively. The mean compressive strength of sandstone concrete of aggregate sizes 6.3, 10, and 14 mm were 19.49, 21.01, 23.21 MPa respectively. The results have revealed that the compressive strength of granite, quartzite and sandstone concrete increased with increase in cement aggregate ratio. Mixture ratio 1:1:2 produced the highest compressive strength of concrete and mixture ratio 1:3:6 produced the lowest compressive strength of concrete. The results have further revealed that compressive strength of the three rock types increased with increase in size of aggregate. The difference in the compressive strength for the three different types of rocks was negligible. Therefore, mixture ratios and aggregate sizes affect concrete compressive strength but rock types used did not affect the compressive strength of concrete samples. Builders and engineers who wish to construct structures should mind most about the aggregate size and mixture ratio than the granite, quartzite or sandstone aggregates used.