COMPRESSIVE STRENGTH OF BLOCKS USING QUARRY DUST AS FINE AGGREGATE

This research investigates the compressive strength of sandcrete blocks using quarry dust as partial replacement for fine aggregates. The study aims to determine the suitability of quarry dust in enhancing the strength characteristics of sandcrete blocks, which are commonly used in construction. Sandcrete blocks were produced using three different mix ratios of cement to quarry dust (1:3, 1:4, and 1:6) with varying water cement ratios of 0.5, 0.6, 0.7, and 0.8 respectively. A total of 36 blocks were molded, with 12 blocks from each mix ratio. These blocks were cured for 7, 14, 21, and 28 days, and their compressive strengths and weights were measured at each curing stage. The results indicated that the compressive strength of the blocks decreased with an increase in water cement ratio for all mix ratios. Among the mix ratios, the 1:3 mix ratio showed the highest compressive strength across all curing periods. The blocks produced with a water cement ratio of 0.5 exhibited the best strength, while those with a water cement ratio of 0.8 showed the lowest compressive strength. The study concluded that quarry dust can effectively be used as a partial substitute for sand in sandcrete block production, although careful control of the mix ratio and water content is essential to achieve the desired compressive strength. The findings also suggest that the use of quarry dust could offer a more cost-effective and sustainable alternative to traditional sand-based sandcrete blocks in the construction industry.