In this research, vandalized crumb rubber is used to partially replace sand as an aggregate for the construction of masonry blocks, with aim of weight as well as cost reduction, and ensuring that the compressive strength is within the acceptable limit. ASTM D5603& D5644 crumb rubber was used in this research and it is sourced from Fagge LGA of Kano State, Nigeria. Standard BS Code Batching and mixing procedure using 1:4 mix ratio and the water-cement ratio of 0.5. Using BS 1881-part II 1983, the compressive strength of the blocks at 7 days are 3.40, 3.00, 2.73 and 2.51 N/mm2 at 0%, 3%, 6% and 9% replacement respectively. For 28 days are 5.21, 4.19, 3.73 and 3.46 N/mm2 at 0%, 3%, 6% and 9% replacement respectively. And all the values are within the acceptable strength of the masonry blocks. The weights of the blocks at 7 days are 1629.7, 1591.9, 1551.9, and 1469.9 kg at 0%, 3%, 6%, and 9% replacement respectively similarly at 28 days was 1575.1, 1476.9, 1366.7 and 1297.6 kg at 0%, 3%, 6%, and 9% replacement respectively, both of which shows a significant reduction in the weight of the blocks. Finally, worthless crumb rubber replaces costly sand aggregate, hence overall cost reduces.
Key words: Masonry Block, Sand, Cement, Crumb Rubber, Strength
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