Adebesin, Joshua Adedamola and Covenant University, Theses (2023) PERFORMANCE ASSESSMENT OF ALKALI TREATED COCONUT FIBRE-REINFORCED SENELIA SENILIS CONCRETE. Masters thesis, Covenant University Ota.
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Abstract
Concrete technology is advancing, and eco-friendly concrete production techniques are being explored to reduce reliance on natural resources. Seashells are being considered as a waste material in concrete, but their durability and strength properties, especially when combined with alkali-treated coconut fiber, require further investigation. The alkali treated fiber-reinforced Senilia senilis concrete was produced by varying the proportion seashell in the ratio of 10, 15, 20, and 25 percentages with addition of 1% alkali treated coconut fiber. Physical tests such as aggregate grading, specific gravity, water absorption for aggregate, abrasion test, aggregate impact. Slump test was carried out of fresh alkali treated fiber reinforced seashell concrete and control mix. Compressive, split tensile and flexural strength tests together with durability assessment, fire resistance and microstructural analysis were performed on the hardened concrete. Specimens were produced using 150 mm cubes, 100 mm cubes, 100mm x 300mm cylinders and 100 x 100 x 500 mm beams. After demoulding, samples were submerged in water for 56 days to cure in order to conduct durability testing. Afterward, specimens were transferred into 5% sodium sulphate (Na2SO4), 5% NaOH, and 5% sodium chloride (NaCl) and 7.5% Na2SO4 and 5% NaCl solutions for additional curing periods of 56 days. On the concrete, the short-term impacts of sulphate and chloride were assessed. The resulting mixture showed notable increases in compressive strength (30.15%), split tensile strength (39.21%) and flexural strength (14.99%) as compared to the control mixture. Also, significant improvements were seen in the compressive strength of cubes after its immersion for 56 days with a 15.46% on cubes removed from 5% NaCl, 34.3% for cubes removed from 5% Na2SO4, 3.069% for cubes removed from a combination of 7.5% Na2SO4 and 5% NaCl, and a 16.38% from cubes removed from NaOH as compared to the control mix. Afterwards the alkali treated fiber reinforced seashell concretes were compared in microstructural analysis specifically SEM and EDX with control. The results provide insightful information on the usage of fiber that has been alkali-treated to increase the durability and fracture resistance of concrete, and they have a great deal of promise for real-world applications in the building sector. According to this study, combining coconut with 1% alkali-treated seashell could lessen the harmful effects of sulphate and chloride salts. The outcome of this study indicated that the application of alkali treated fiber reinforced Senilia senilis concrete increases the resistance against aggressive environment.
| Item Type: | Thesis (Masters) |
|---|---|
| Uncontrolled Keywords: | Fiber-reinforced concrete, durability, seashell, compressive strength, coconut fiber, sulphate attack, chloride attack, sodium attack |
| Subjects: | T Technology > TA Engineering (General). Civil engineering (General) |
| Divisions: | Faculty of Engineering, Science and Mathematics > School of Civil Engineering and the Environment |
| Depositing User: | nwokealisi |
| Date Deposited: | 23 Aug 2023 12:45 |
| Last Modified: | 23 Aug 2023 12:45 |
| URI: | http://eprints.covenantuniversity.edu.ng/id/eprint/17290 |
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