EFFECTS OF THE PARTIAL REPLACEMENT OF FINE AGGREGATES WITH QUARRY DUST ON THE STRENGTH AND WORKABILITY OF CONCRETE
Abstract
The current study focuses on determining the suitability of using quarry dust as fine aggregates in traditional concrete. It presents the feasibility of the usage of quarry dust in an increasing order of 10%, 20%, 30%, 40% and 50% as substitutes for sharp sand in concrete. Portland cement known as Dangote 3x cement was used for the study. During the tenure of the study, some physical and engineering properties of quarry dust and sand were determined and compared. Specific gravity tests and sieve analysis tests were also carried out where applicable. The compressive strength of concrete was determined after replacing sand with quarry dust in various ratios. Strength results of the concrete cubes used were taken at 7, 14 and 28 days of curing. The study showed encouraging results for the replacement of 50% of sand with quarry dust. From the results of the experimental investigations conducted, it is found that 50% replacement of fine aggregate by quarry dust gives maximum result in strength than normal concrete. The workability of plastic concrete at each phase of fine sand replacement was also obtained. With a constant water-cement ratio of 0.6, it was observed that the workability of concrete reduces as more quarry dust is used as replacement for sharp sand in a concrete mixture. Therefore, trial casting with the quarry dust should be carried out to achieve the most suitable water content and mix proportions to achieve a desired workability levels and strength requirements.
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