Evaluation of corn cob ash as partial replacement of cement in concrete

Cement is generally used as a binding material in concrete for the construction purposes. During manufacturing processes of cement, carbon dioxide-a greenhouse gas-is emitted. In order to mitigate carbon dioxide emission, the cement can be partly replaced by certain other materials. The present study was conducted to replace the Ordinary Portland Cement (OPC) with corn cob ash (CCA) up to 20%. The workability and compressive strength was noted to study the effect of replacement of cement with CCA. The results showed that use of CCA as a replacement of cement decreased the workability as well as the strength of concrete. Reduction in strength, however, was small for the replacement level of 5% and 10%. Thus, CCA can be used to replace cement up to 10% without compromising the strength of concrete.