Abstract
This research was conducted with the aim of developing hydraulic structures and enhancing the performance of a group of reinforced concrete structures located in coastal areas.Today, the importance of designing and evaluating the durability of selfcompacting concretes has increased significantly.In this study, focusing on the use of carboxylate-based superplasticizers, microsilica, and calcium carbonate powder in the design of self-compacting concrete (SCC), the stability of concretes exposed to or submerged in seawater has been investigated.The results of this study indicate that the high concentration of chlorides in seawater increases the rate of hydration, shortens the setting time, and enhances the early-age strength of the concrete.Furthermore, laboratory findings demonstrate that superplasticizers based on polycarboxylate effectively neutralize the detrimental effects of chlorides.Additionally, laboratory specimens cured in seawater exhibited relatively higher strength compared to those cured in fresh water.