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Structural Engineering and Mechanics Volume 93, Number 2, January25 2025 , pages 125-134 DOI: https://doi.org/10.12989/sem.2025.93.2.125 |
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Investigation on partial replacement of cement with coconut shell ash and coarse aggregate with coconut shell with the addition of steel fibers |
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Siddesha Hanumanthappa, T.K. Bharath, H.O. Chethan Naik, Vaishali, D.S. Rajendra Prasad and A.R. Pradeep
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| Abstract | ||
| A significant quantity of coconut shell waste is produced from coconut product production industries and its proper eradication needs to be investigated. Researchers have suggested using it as a concrete ingredient due to high strength, better modulus properties, high lignin content, low cellulose content, and non-biodegradable. Lignin in coconut shell makes the concrete weather resistant and its low cellulose content absorbs less moisture compared to other agricultural waste. This research is aimed at quantifying the result of partial replacement of the coarse aggregate by coconut shell (CS), and replacing partially the cement by coconut shell ash (CSA) to prepare concrete. CSA possesses high amount of silica reacts with water and calcium hydroxide to form C-S-H gel in concrete. Both cement and coarse aggregate are partially replaced together by 10%, 15% and 20% respectively. It was noticed that the strength in compression has been decreased as the amount of CSA and CS increased. Results indicated that with 15% replacement by CSA and CS, the compressive strength after 7 days is increase by 2.48%; whereas increase in compressive strength after 28 days was 2.81%. When the steel fibers were added the corresponding compressive strength is enhanced by 4.13% and 4.31% after 7 and 28 days respectively. Similarly, the strength in splitting increases to 1.62% and 3.31% for 15% replacement of CS and CSA for 7 and 28 days respectively. Further, this strength is increased by 4.06% and 8.09% for the mix 20% CS and CSA when steel fibres were added. When the replacement is 20%, the concrete became lighter by 17%. The RCPT test results indicated low chloride ion penetration for addition of these two materials. | ||
| Key Words | ||
| coconut shell ash; coconut shell; concrete; durability; strength | ||
| Address | ||
| Siddesha Hanumanthappa, T.K. Bharath, H.O. Chethan Naik, Vaishali, D.S. Rajendra Prasad: Department of Civil Engineering, Siddaganga Institute of Technology, B.H. Road, Tumakuru, 572 103, Karnataka, India A.R. Pradeep: Department of Civil Engineering, Sri Siddhartha Institute of Technology, Tumakuru, Karnataka, India | ||