PERIWINKLE SHELLS AS PARTIAL REPLACEMENT FOR GRAVEL IN LIGHT WEIGHT CONCRETE

This paper reports the use of periwinkle shells as partial replacement of gravel aggregate in the production of light weight concrete. Physical and mechanical properties of periwinkle shells were determined. A total of 32 concrete cubes of size 150 x 150 x 150 mm with 5%, 10%, and 15% weight of periwinkle shells in replacement of gravel were cast, crushed and their compressive strengths were determined. After cured for 28days, concrete without periwinkle shells had compressive strength of 23.25N/mm2 while 5%, 10%, and 15% replacements of gravel with periwinkle shells had 14.05N/mm2 11.5N/mm2 and 9.3N/mm2 respectively. The results also showed that the compressive strengths of concrete without replacement of gravel with periwinkle shells cured for 28days had 19%, 24% and 27% greater than 5%, 10%, and 15% replacements of gravel with periwinkle shells respectively. The concrete cube with 10% replacement of gravel with periwinkle shells cured for 28days had density 2489.1kg/m3