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17. Introduction This study is concerned with identifying a corrosion rate-limiting process in the protection of reinforced concrete (RC) by a hermetic epoxy coating and defining minimum requirements which must be satisfied for the epoxy coating to be effective in suppressing corrosion. For this reason, the discussion in this paper is focused on ferrous-based epoxy (E-type) coatings as they provide a hermetic barrier to the ingress of chloride ions from the subgrade to the concrete elements. At the same time, it should be noted that although epoxy coatings are the focus of this study, the concepts described here apply equally to alumina (Al2O3)-based epoxy conforms and zinc-based epoxy.

18. General Objective The objective of this study was to investigate the effect of epoxy coating thickness and curing temperature on its long-term performance. The coating was applied over concrete specimens to simulate the effect of long-term exposure to rainfall in the objective environment. The study was conducted in two phases. In the first phase, the impact of coating thickness and curing temperature on the resistance of concrete specimens to chloride ion-induced corrosion was evaluated. In the second phase, the effect of coating on concrete specimens exposed to chloride ion-induced corrosion was evaluated.

19. Test Matrix and Test Stand This study investigated the performance of the epoxy coating on 50mmx50mmx100mm concrete sections exposed to steady-state chloride ion-containing rainwater over a period of seven days. One half of the samples were cured at 20°C for seven days, and the other half was cured at 60°C for seven days. The resistance to chloride ion-induced corrosion was assessed by recording the chloride ion content of the pore water. Four different epoxy coating thickness, 1.5, 2.5, 4.0, and 6.0mm, were used in the study. Coating samples were prepared by using a torch to heat the edge of a concrete slab to approximately 380°C, thereby activating the epoxy. The experiment was repeated a total of six times. Two of the test specimens from each group were tested at each test period and coating thickness. d2c66b5586