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Journal of Emerging Trends in Engineering and Applied Sciences (JETEAS)

ISSN:2141-7016

Article Title: Strength Properties of Corn Cob Ash Concrete
by Olafusi Oladipupo S and Olutoge Festus A

Abstract:
The objective of this paper is to enhance the reduction of corn cob wastes and reduce the cost of concrete production by using locally available materials. Physical and mechanical properties of varying percentage of CCA cement concrete and 100% cement concrete of mix 1:2:4 and 0.5 water-cement ratios were examined and compared. A total of 72 concrete cubes of size 150 x 150 x 150 mm3 and 12 concrete cylinders of size 100mm (diameter) x 200mm (height) with different percentages by volume of CCA to Portland cement in the order 0:100, 10:90 and 20:80 were cast, tested and their physical and mechanical properties determined. A high strength (35MPa) concrete was further designed using CCA as a partial replacement for cement with a total of 32 concrete cubes (16 samples each for 0% and 10% partial replacements) and 8 concrete cylinders (4 samples each of 0% and 10% partial replacements). The specific gravity of the CCA was 1.15, while the mechanical properties which included compressive strength tests showed that 10% of the CCA in replacement for cement was quite satisfactory with no compromise in compressive strength requirements for concrete mix ratios 1:2:4 at 7days, but did not meet the standard strength at 14, 21 and 28 days. The 20% CCA replacement for cement did not meet the satisfactory strength requirements at all. While the split tensile test revealed that concrete tensile strength is about 11-12 times lower than its compressive strength. The high strength concrete designed was adequate in compressive and split tensile strength requirement, but did not reach the designed compressive strength of 35MPa at 28days. However, test results showed that the use of CCA as a partial replacement for cement in concrete, particularly in plain concrete works and non-load bearing structures; will enhance waste to wealth initiative. Though CCA could be used as a partial replacement for cement in high strength concrete, but the CCA concrete would take longer time to achieve its designed strength and the CCA concrete would require water/cement ratio less than 0.40. Hence, the use of superplasticizers is required to enhance workability. This research was carried out at the University of Ibadan, Ibadan, Nigeria.
Keywords: concrete; corn cob ash (CCA); compressive strength; tensile strength; ordinary portland cement
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ISSN: 2141-7016

Editor in Chief.

Prof. Gui Yun Tian
Professor of Sensor Technologies
School of Electrical, Electronic and Computer Engineering
University of Newcastle
United Kingdom

 

 

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