Research on the performance of seawater sea-sand concrete: A review

With the development of the marine economy and the deployment of national maritime power, a large number of coastal port structures and civil engineering projects need to be constructed. The preparation of traditional concrete will excessively consume river sand, ore, and freshwater resources, while also violating the concept of sustainable development. In order to solve the problems of lack of resources and high transportation costs, it is crucial to prepare seawater and sea sand concrete (SWSSC). This paper takes seawater and (or) sea sand concrete as the research object, and comprehensively analyzes the workability, mechanical performance, durability of SWSSC, and the development law of bonding performance and durability of SWSSC and fiber reinforced polymer (FRP) reinforcement composite structure by comparing the characteristics of seawater and sea sand. The results indicate that the early compressive strength of SWSSC develops faster than that of ordinary concrete, and the later strength of the two is similar. The chloride ions in seawater and sea sand cause corrosion of steel bars, but have little impact on carbonization depth and freeze–thaw resistance. Using mineral admixtures and FRP bars can effectively solve a series of durability problems caused by the high chloride ion content in SWSSC. However, alkaline environments significantly affect FRP bars and have good corrosion resistance in seawater environments.