Abstract
This research was carried out to investigate the effect of partially replacing cement with quarry dust in cement-sand mortar. Tests including setting times, water absorption, compressive strength and density test were carried out on mortar with cement partially replaced with 0%, 5%, 10%, 15%, 20%, 25% and 30% quarry dust and presented. Experimental results show that replacement of quarry dust as partial replacement of cement in cement-sand mortar decrease the initial and final setting times of cement paste and increase the water absorption of the mortar. The partial replacement shows an improvement of compressive strength at 5% quarry dust content after which there is a decrease with increase in quarry dust content at all the ages. The increase in compressive strength at 5% indicates possible pozzalanic activity at that level. Thus quarry dust can be utilized as cement replacement material at 5% dust content. Above this it can be utilized as fine aggregate replacement for use in low-strength mortar applications
Highlights
Cement mortar is a mixture of cement and sand majorly used in bonding blocks/bricks units and in plastering
There is a decrease in initial setting time of 5%, 11%, 19%, 21%, 19% and 19% over the 0% control paste for 5, 10, 15, 20, 25 and 30% quarry dust content respectively
The decreases are not significant and all the values for the initial and final setting times are within the recommended minimum OPC cement initial setting time of 45 minutes and maximum final cement setting time of 10 hours specified in BS EN 197 (2011)
Summary
Cement mortar is a mixture of cement and sand majorly used in bonding blocks/bricks units and in plastering. Acccording to Aliyu et al (2020), Tavakolia et al (2013), Meyer (2009) and Mehta (1983), sustainability is another desired reason for using waste products to replace cement in mortar and concrete apart from the factors of high consumption of natural resources and high cost of construction materials. To overcome these problems there is a need to replace cement with some other cheaper materials. The present research work evaluates the use of quarry dust for partial replacement of cement in cement-sand mortar
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