ABSTRACT
This experiment studies the effect of waste ceramic tile aggregate as partial replacement of conventional coarse aggregate on the compressive strength and durability of concrete, in an attempt to determine the possibility of utilizing waste ceramic tile aggregate(WCTA) as partial replacement for conventional granite in concrete production. For the experiment, a M25 grade concrete with a water/cement ratio of 0.5 was preparedusing granite substituted with WCTA at a replacement percentage of 0%, 10%, 20%, 30%, 40% and 50%. Tests such as sieve analysis and aggregate impact value wasperformed on the various aggregates used in the study to determine their suitability. Concrete cubes of size 100mm×100mm×100mm were casted and tested for compressivestrength after a curing period of 7 and 28 days. Water absorption test was also performedon the hardened concrete mixes to determine their durability. From the experimental results, it is found that the 7 th day compressive strengthof theconcrete mixes are 21.32N/mm², 25.37N/mm², 23.54N/mm², 24.20N/mm², 22.21N/mm² and 20.47N/mm², while 28th day compressive strength is found to be 29.66N/mm², 29.80N/mm², 31.94N/mm², 33.59N/mm², 29.65N/mm² and 27.80N/mm², for 0%, 10%, 20%, 30%, 40% and 50% substitution respectively. Also the water absorptionof theconcrete samples is observed to be 2.36%, 2.47%, 2.21%, 1.64%, 1.98%and 2.14%for0%, 10% ,20% ,30%, 40% and 50% respectively. The result reveals that the useofWCTA as partial replacement of coarse aggregate in concrete leads to the enhancement of the compressive strength of concrete, as long it doesn't exceed 30%replacement. Alsothe addition of WCTA leads to an increase in the water absorption of the concretefor10% substitution with WCTA, while it leads to a decrease in water absorptionfor 20-50% substitution with WCTA, with 30% having the least water absorption. Thereforeit is recommended to limit the replacement of granite with WCTA to a maximumof 40%, while for optimal strength and durability of structural concrete, replacement of granitewith WCTA should be kept at 30%.
