Durability Characteristics of Corn-Cob Ash (CCA) Blended Cement Concrete
Abstract
The durability of reinforced concrete is greatly hampered by the vulnerability of reinforcing steel to corrosion by water ingress, especially in an exposed environment. Water is the basic medium through which hazardous chemicals get into the concrete and then reinforcement. This study determines the durability characteristics of Corn-Cob Ash (CCA) blended cement concrete in water transport. Both review and experimental techniques were adopted as the research methodology. Materials tests and methods were prepared following ASTM, C 494. concrete mix was designed to obtain a compressive strength of 25N/mm2 and 30N/mm2 at 28 days with water-to-binder (cement/CCA) ratios of 0.45 and 0.50 respectively. Four different percentage replacements of Ordinary Portland Cement (OPC) (0%, 10%, 20%, and 30%) with CCA by weight of cement were adopted. The specimens were cured for 90 days while testing for the characteristics. The results show that CCA is a class N calcined natural pozzolan that attains its optimum characteristics strength between 56 and 90 days. Water transport, porosity/water absorption and sorptivity of the concretes were lower at 10% cement replacement than the corresponding control mix; thus, the durability of the concrete would be greater than one without CCA when combined with steel. Therefore, a designed strength of 30N/mm2 containing 10% CCA-cement replacement in concrete is recommended for reinforced concrete construction prone to water ingress.
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