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IJSTR >> Volume 1 - Issue 8, September 2012 Edition

International Journal of Scientific & Technology Research  
International Journal of Scientific & Technology Research

Website: http://www.ijstr.org

ISSN 2277-8616

Coconut Shell Ash As Partial Replacement of Ordinary Portland Cement In Concrete Production

[Full Text]



Utsev, J. T., Taku, J. K.



Keywords: Compressive Strength, concrete, coconut shell ash, Cement



Abstract - The cost of cement used in concrete works is on the increase and unaffordable, yet the need for housing and other constructions requiring this material keeps growing with increasing population, thus the need to find alternative binding materials that can be used solely or in partial replacement of cement. Agricultural waste material, in this case, coconut shells, which is an environmental pollutant, are collected and burnt in the open air (uncontrolled combustion) for three hours to produce coconut shell ash (CSA), which in turn was used as pozzolana in partial replacement of cement in concrete production. Concrete cubes were produced using various replacement levels of 0, 10, 15, 20, 25 and 30 percent of OPC with CSA. A total of 54 cubes were produced and cured by immersing them in water for 7, 14 and 28 days respectively. Properties such as compressive strength, density, setting times and pozzolanic activity index were determined. The results showed that the densities of concrete cubes for 10 -15% replacement was above 2400Kg/m3 and the compressive strength increased from 12.45N/mm2 at 7days to 31.78N/mm2 at 28 days curing thus meeting the requirement for use in both heavy weight and light weight concreting. Thus, 10 -15% replacement of OPC with CSA is recommended for both heavy weight and light weight concrete production.



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