Response Surface Analysis of the Corrosion Effect of Metakaolin in Reinforced Concrete
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ORIGINAL PAPER
Response Surface Analysis of the Corrosion Effect of Metakaolin in Reinforced Concrete Ayobamin A. Busari 1,2 & Williams K. Kupolati 1 & Julius M. Ndambuki 1 & Emmanuel R. Sadiku 3 & Jacques Snyman 1 & Loto Tolulope 4 & Osirim Keren 2 & Adetayo Oluwaseun 5 Received: 6 February 2020 / Accepted: 3 July 2020 # Springer Nature B.V. 2020
Abstract Concrete is one of the most utilized construction materials. The use of sustainable cementitious material is one of the new trends in concrete technology. Several cementitious materials have been used as partial and full replacement for cement in concrete. These materials have been used in a bid to improve sustainability and reduce production cost. However, the corrosion effect of these materials has been neglected. The experimental research assessed the corrosion effect of metakaolin on some samples of concrete. This was achieved by evaluating the concrete pore solution. The metakaolin was used as a partial replacement for cement at 0, 10, 20, and 30% replacement which gave the optimum mechanical strength. The concrete pore was extracted through mechanical means. The inhibition efficiency of metakaolin in concrete production was assessed using the and weight loss method by inserting the mild steel in artificial concrete pore solution. A reduction in the corrosion rate was observed at higher percentage addition of metakaolin which signifies an improvement in the inhibition of the developed concrete The relationship between the observed parameters was evaluated using response surface methodology. The result of the analysis showed that a unit increase in time would cause a 0.03 increase in the corrosion rate. Additionally, a unit increase in the temperature will have a 0.065 positive effect on the corrosion rate of mild steel. The R2 value showed that about 89.7% variation in the corrosion rate was accounted for by the effect of the independent variable (time, temperature and metakaolin). The outcome of this research will serve as a guide for construction workers, engineers and other researchers on the corrosion effect of this sustainable supplementary material in concrete technology towards the design and construction of sustainable concrete infrastructure. Keywords Response surface . Concrete . Corrosion . Corrosion rate . Weight loss . Metakaolin
1 Introduction Metakaolin is derived from the calcination of pure or refined Kaolinitic clay at temperatures between 650 °C and 850 °C,
followed by the grinding process. It is a material with highquality pozzolanic properties which is usually used as a replacement for the cement to enhance the strength and durability of concrete. Concrete is one of the most used materials in the
* Ayobamin A. Busari [email protected]
Osirim Keren [email protected]
Williams K. Kupolati [email protected]
1
Department of Civil Engineering, Tshwane University of Technology, Pretoria, South Africa
Julius M. Ndambuki [email protected]
2
Department of Civil Engineering, Covenant University, Ota, Nig
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