Strength Prediction of GPC using Alkali pH, Salinity, Temperature, and Conductivity as Continuous Predictors

Oyebisi, S.O and Owolabi, E. F. and Owamah, H.I. and Oluwafemi, John and Ayanbisi, O (2021) Strength Prediction of GPC using Alkali pH, Salinity, Temperature, and Conductivity as Continuous Predictors. In: International Conference on Engineering for Sustainable World, 2021, Online.

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Abstract

This study explored the chemistry of alkaline activators, and their physical properties were used to predict the compressive strength of geopolymer concrete (GPC). Sodium silicate (Na2SiO3) gel and six various pellets of sodium hydroxide (NaOH) were used as the alkaline activators. Ground granulated blast furnace slag (GGBFS) and corncob ash (CCA) were utilized as supplementary cementitious materials (SCMs) in the production of GPC. A mix design proportion of Grade 30 MPa concrete and 14 M of alkaline activator (AA) was adopted. The concrete constituents were prepared, cured, and tested at 7, 28, 56, and 90 days. The relationship between the compressive strengths and the pH, temperature, salinity, and conductivity of alkaline activator was modelled. The experimental findings indicated that the temperature, conductivity and salinity of the alkali increased with increasing pH. Besides, the compressive strength of GPC increased with increasing alkali’s pH, temperature, conductivity, and salinity. The coefficients of determinations (R2) showed that the models were 84, 90, 90, and 89% fit to predict the relationship at 7, 28, 56, and 90 days curing, respectively. These findings can be used to predict the strength trends of GPC incorporating SCMs.

Item Type:	Conference or Workshop Item (Paper)
Uncontrolled Keywords:	Geopolymer concrete, supplementary cementitious materials, temperature, conductivity, salinity, compressive strength, modelling.
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:	05 Dec 2022 13:32
Last Modified:	05 Dec 2022 13:32
URI:	http://eprints.covenantuniversity.edu.ng/id/eprint/16486

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