Oyebisi, S.O and Ede, A. N. and Olutoge, F. A. and Igba, T. and Oluwafemi, John (2019) Effects of rest period on the strength performance of geopolymer concrete. In: 1st International Conference on Sustainable Infrastructural Development, 2019, Online.
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Abstract
The study investigated the effects of rest period on the short-term mechanical property of geopolymer concrete (GPC) that could possibly be easy to embrace in the field to achieve an optimum strength performance. The study utilized both corncob ash (CCA) and ground granulated blast furnace slag (GGBFS) as sustainable construction binders with a view to building sustainable infrastructure. Also, sodium silicate gel (Na2SiO3) and sodium hydroxide (NaOH) solution was used as an alkaline activator, and prepared in 14 molar concentration of NaOH pellets using a mix ratio of grade 30 MPa and grade 40 MPa concretes. GGBFS was substituted in 0, 20, 40, 60, 80, and 100% by volume of CCA. The rest periods (RP) for the fresh concrete were selected as 1, 2, 3, 4 and 5 days before being demoulded. Thereafter, the concrete samples were removed from the moulds and cured under ambient conditions for 7, 28, 56 and 90 days. The compressive strength of the hardened concrete samples was then determined. The study findings reveal an optimum strength performance at 4 days rest period for all classes of concrete produced when compared with 1, 2, 3 and 5 days. Thus, this result can be practically employed and incorporated in the design of geopolymer concrete and at the construction site.
| Item Type: | Conference or Workshop Item (Paper) |
|---|---|
| Uncontrolled Keywords: | geopolymer concrete; corncob ash, ground granulated blast furnace slag; sodium silicate; sodium hydroxide; compressive strength; rest period |
| 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: | 12 Jan 2023 10:56 |
| Last Modified: | 12 Jan 2023 10:56 |
| URI: | http://eprints.covenantuniversity.edu.ng/id/eprint/16513 |
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