Review of the Short-Term Compressive Properties of Single-Skin Confined Seawater Sea Sand Concrete Columns with FRP Wrapping

Excessive exploitation of fresh water and river sand has prompted researchers to investigate seawater sea sand concrete (SWSSC) as a viable alternative to traditional concrete in the construction sector. The mechanical properties of SWSSC columns are comparable to traditional concrete columns, and these properties can be further enhanced through confinement. Strengthening or retrofitting of SWSSC columns with Fibre reinforced polymer (FRP) sheets in a single-skin fashion is an effective and easy way to achieve this enhancement. This review summarizes the available literature on the experimental investigation performed to date on single-skin confined SWSSC columns using different types of FRP sheets under compressive loading. Full wrapping, partial wrapping, and non-uniform wrapping are the three wrapping strategies under this confinement scheme. Employed wrapping strategy, FRP material type, number of layers of FRP, cross-sectional shape of the columns, and concrete strength are the key parameters that influence the ultimate strength and ultimate strain of the confined specimens. The failure modes and stress-strain curve characteristics for the three wrapping strategies are discussed. Finally, some directions for future research work in this area are also proposed.