Umudike Journal of Engineering and Technology

Michael Okpara University of Agriculture, Umudike


EFFECTS OF COARSE AGGREGATE SIZES ON THE FLEXURAL STRENGTH OF CONCRETE

Ozioko, H. O.
Department of Civil Engineering, Michael Okpara University of Agriculture Umudike, Abia State Nigeria



ABSTRACT

In order to determine the effects of coarse aggregate size on the flexural strength of concrete, concrete beams were produced in accordance with BS 1881-108 (1983) and American Society for Testing of Materials (ASTM C293) with varying aggregate sizes 9.0mm, 14mm, 18mm, and 24mm, using a standard mould of internal dimension of 150 x 150 x 750mm for the reinforced concrete beam. The water cement ratio was kept at 0.65 with a mix proportion of 1:2:4. The specimen produced were all subjected to curing in water for 28days and were all tested to determine the flexural strength using Universal Testing Machine. The slump tests (Workability) of the concrete mixtures prepared with each of the aggregate sizes were also conducted. The results showed that, aggregate sizes of 9.0, 14.0, 18.0 and 24.0mm have slump values of 101, 120, 158 and 160mm and flexural strengths of 4.91, 4.81, 4.13 and 4.03N/mm². It was concluded that, concrete to be used mostly to resist flexural stresses should be made of finer coarse aggregates.



Keywords: Coarse Aggregate, Flexural Strength


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Published
Friday, December 18, 2015

Issue
Vol. 1 No. 2, DEC 2015

Article Section
GENERAL

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