Tumba, Masi and Ofuyatan, Olatokunbo M. and Uwadiale, Osefunaimhen and Oluwafemi, John (2018) Effect of Sulphate and Acid on Self-Compacting Concrete Containing Corn Cob Ash. In: ICESW IOP Publishing IOP Conf. Series: Materials Science and Engineering.
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Abstract
Self-compacting concrete requires high powder content which implies increased cost and increased CO2 emission into the environment; hence, the need for the inculcation of a supplementary cementitious material (SCM) to the concrete mix such as corn cob ash (CCA) which is obtained by drying, grinding and burning the corn cobs. The chemical composition of the corn cob ash showed that it was pozzolanic as it conformed to the requirements stated in ASTM C618. Replacement of cement with CCA was carried out at levels of 0% (control), 5%, 10%, 15% and 20% and workability test was conducted at each replacement levels. The curing of the cubes was conducted for 7, 14 and 28 days in 3 mediums; water, hydrochloric acid (HCl) and magnesium sulphate (MgSo4). The cubes were weighed and crushed from which it was observed that 5% replacement showed better compressive strength, proving to be the optimum result. Results from 15% and above were unable to attain close enough values to the required strength but showed better resistance when submerged in the sulphate and acid solution. It was also observed that increasing CCA content, reduced the strength deterioration factor (SDF) of the concrete, indicating improved durability and the possible use of CCA for partial replacement of cement in SCC. However, replacement levels from 15% and above require longer curing period to attain better strengths as increase in CCA levels decreases the compressive strength of the concrete
| Item Type: | Conference or Workshop Item (Paper) |
|---|---|
| Uncontrolled Keywords: | Self Compacting Concrete, Corn Cob Ash, Hardened Concrete, Fresh Concrete, Strength |
| Subjects: | T Technology > T Technology (General) T Technology > TA Engineering (General). Civil engineering (General) |
| Divisions: | Faculty of Engineering, Science and Mathematics > School of Civil Engineering and the Environment |
| Depositing User: | Mrs Hannah Akinwumi |
| Date Deposited: | 02 Oct 2018 11:53 |
| Last Modified: | 02 Oct 2018 11:53 |
| URI: | http://eprints.covenantuniversity.edu.ng/id/eprint/11955 |
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