Replacement of Fine Aggregates of Concrete by Over Burnt Bricks and Broken Tiles

Abstract

 In this research work, study of the effect on  the properties of concrete: (compressive strength, split  tensile strength and workability in particular) by the  replacement of conventional fine aggregates:(sand), by a  pulverized mixture of Over-burnt Bricks and Broken Tiles,  in equivalent proportions was carried out. Over burnt bricks  and broken tiles are among toxic constructional waste  products thus, their use in the form of fine aggregates will  serve as a purpose and it will also help to mitigate their  disposal problems. Sand is a naturally available resource thus  in order to minimize its exploitation use of these waste  materials as fine aggregates provides an alternative thereby  reducing burden on the environment. Replacement of  conventional fine aggregates by over burnt bricks and broken  tiles also makes the concrete economical, more water proof,  resistant to cracks as well as resilient to various alkali and  chemical attacks compared to conventional concrete with no  any such replacements that too without reducing strength. In conduction of tests, definite proportion of conventional fine  aggregate:(sand), was substituted in various trials, till 100%  of sand got replaced by mixture of pulverized over burnt  bricks and broken tiles. The results obtained for various tests  conducted on samples with replacements were examined and  compared with the results of standard design mix of M25  grade concrete. The test observations revealed that, as the  percentage of replacement of fine aggregate (sand) by a  mixture of overburnt bricks and broken tiles increased, the  strength of concrete mix first decreased then increased with  respect to standard M25 grade concrete with 0% or no  replacement of the conventional fine aggregates(sand) and  the maximum value of strength attained was at 80%  replacement of fine aggregate by pulverized overburnt bricks  and broken tiles mixture.