Abstract
This paper presents an experimental study aimed at improving the durability of reinforced concrete water treatment reservoirs exposed to a high concentration of the water treatment coagulant Al2(SO4)3. This investigation was carried out using electrochemical methods. The sulfate concentration of 3.5% was chosen to meet the requirements of exposure class XA3 according to standard NF EN 206-1. The results were obtained from three concrete mixes: a control mix containing 100% ordinary Portland cement (OPC), and 25% fly ash (FA). The samples were immersed in the solution and then subjected to cyclic corrosion acceleration by means of an imposed voltage of 15 V. Electrochemical impedance spectroscopy (EIS) was used to monitor changes in the resistance of these concretes under accelerated corrosion. In addition, X-ray diffraction (XRD) was used to examine the corrosion products at the end of the tests. The results indicate that the mineral additives made substantial improvements to the durability of the concrete. Moreover, 25% FA gave the best results against corrosion.
doi: 10.17756/nwj.2023-s2-031
Citation: Ech-chebab A, Ejbouh A, Galai M, Lachhab R, Belhaj T, et al. 2023. Effect of Fly Ash on the Sustainability of Water Treatment Reservoir Concrete Subjected to 3.5% Al2(SO4)3 by Electrochemical Impedance Spectroscopy. NanoWorld J 9(S2): S174-S179.
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