Abstract
The use of crushed quarry dust as a partial replacement of river sand in concrete production was investigated in this study. This is expedient as quarry dust can be available at some locations with insufficient river sand for construction purposes. The use of quarry dust is also in concrete is also a measure necessary for improvement of concrete strength. River sand was replaced with quarry dust for different mix designs of concrete for 0% to 25% replacement levels with 5% intervals. The physical properties of river sand and quarry dust were tested and reported and the workability as well as compressive strengths of the concrete mixtures were also tested. It was observed that the slump values increased with increase in percentage replacement of sand with quarry dust. The compressive strength of cubes at 28 day curing for control mixture of 1:3:6 at 0% partial replacement of river sand with quarry dust was 12.6N/mm2 but compressive strengths of 21.5 N/mm2 and 26.0 N/mm2 were gotten for 1:2:4 concrete and 1:1.5:3 concrete respectively. As the quarry dust content increased to 25%, the 28day compressive strength increased to 13.58 N/mm2 and 21.57 N/mm2 for the 1:3:6 and 1:2:4 mixes respectively. Compressive strength values decreased to a value of 25.72N/mm2 for the 1:1.5:3 concrete mix. The maximum compressive strength values were reached at 20% quarry dust content at the age of 28 days for the three concrete grades investigated. The increase in compressive strength with inclusion of quarry dust was attributed to the higher specific gravity of quarry dust above river sand. The compressive strength of quarry dust concrete continued to increase with age for all the percentages of quarry dust contents. Quarry dust was recommended as a suitable partial replacement for river bed sand in concrete production.
Highlights
The use of quarry dust in concrete is desirable because of its benefits which include useful disposal of by products, reduction of river sand consumption, increasing the strength parameters of concrete, and increasing the workability of concrete (Lohani et al, 2012)
The three mix ratios considered in this study are 1:1.5:3, 1:2:4, and 1:3:6 and the amounts of quarry dust was varied at 0%, 5%, 10%, 15%, 20% and 25% replacement levels of river sand by quarry dust
This study focused on the use of quarry dust as a partial replacement of river sand in concrete production
Summary
The use of quarry dust in concrete is desirable because of its benefits which include useful disposal of by products, reduction of river sand consumption, increasing the strength parameters of concrete, and increasing the workability of concrete (Lohani et al, 2012) This innovation has been found useful in concrete for different construction activities including roads, buildings, bricks, tiles etc. Quarry dust has been used for different activities in the construction industry such as road construction and manufacture of building materials such as light weight aggregates, bricks, and tiles. It is a by-product of stone crushing. It was envisaged that crushed rock aggregates are more suitable for production of high strength concrete compared to natural gravel and sand
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