PARTIAL REPLACEMENT OF FINE AGGREGATE WITH EGG AND SNAIL SHELLS IN THE PRODUCTION OF CONCRETE
Keywords:
Eggshell powder, Snail shell powder, Aggregates, Particle size distribution, Compressive strength.Abstract
Egg and snail shells are agricultural waste materials generated in abundance from hatcheries, homes, and food industries. They contribute continuously to environmental and disposal problems. This study examined the suitability of egg and snail shells to replace fine aggregate (sand) partially in concrete for effective disposal of these materials and to reduce environmental problems. Powdered shells as fine were added in proportions 2½%, 5%, 7½%, 10%, 12½%, and 15% to replace fine aggregate in the mix ratio 1:2:4. The two shells composed of compounds of calcium which is very similar to that of cement. Results showed that both egg and snail shells influenced the compressive strength of concrete. The compressive strength of concrete modified with eggshell decreases as the percentage replacement increases. However, an appreciable increase in compressive strength at 2.5% replacement was observed when snail shell was used up to the 14th day. Maximum compressive strength 14.08 N/mm2 (eggshell) and 18.12 N/mm2 (snail shell) were recorded on the 28th day for 2.5% replacement was used for concrete modified with egg and snail shells. The positive effects of snail shell on the compressive strength of the concrete revealed that snail shell contains an appreciable percentage of calcium carbonate more than eggshell and the particle size distribution and texture of snail shell could be contributory factors to a better performance of concrete modified with snail shell than that of concrete with eggshell.
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