Oyebisi, S.O and Ede, A. N. and Olutoge, F. A. and Omole, D. O. (2020) Geopolymer concrete incorporating agro-industrial wastes: Effects on mechanical properties, microstructural behaviour and mineralogical phases. Construction and Building Materials, 256.
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Abstract
The increasing effects of environmental degradation and global warming owing to the production of Portland cement for uses in the construction industry premise the need for sustainable construction materials. This study, therefore, harnessed corncob ash (CCA) and ground granulated blast furnace slag (GGBFS) for the production of geopolymer concrete (GPC) at ambient curing conditions. Corncob was dehydroxylated at 600 °C and partially used as replacement for GGBFS at 0%, 20%, 40%, 60%, 80%, and 100%. The activators used were sodium silicate (SS) and sodium hydroxide (SH), while the molar concentrations of SH were varied at 12 M, 14 M, and 16 M. Moreover, mechanical properties, microstructural behaviour and mineralogical phases of the selected samples were examined. The results revealed that up to 40% CCA replacement level exhibited higher strengths than Portland cement concrete (PCC). Besides, a good relationship exists between the experimental results and the proposed model equations. These proposed models can be beneficial in the development of the strength design of GPC and PCC incorporating agro-industrial wastes. Furthermore, the study shows the possibility of incorporating CCA with GGBFS for production of GPC and the tenability of curing GPC at ambient conditions for the structural application was also attained.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | Natural pozzolan Supplementary cementitious material Concrete Microstructure Compressive strength Flexural strength Splitting tensile strength Alkaline liquid Waste management |
| 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: | AKINWUMI |
| Date Deposited: | 31 Oct 2023 10:30 |
| Last Modified: | 31 Oct 2023 10:30 |
| URI: | http://eprints.covenantuniversity.edu.ng/id/eprint/17458 |
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