There are some possibilities that construction cost of port concrete structures can be reduced by reducing the weight of structure, which leads to simplification of construction procedures, decrease in inertia forces during earthquakes, mitigation of effect on the supporting ground, and so on. One of the methods to realize a light structure is the application of light-weight concrete. However, conventional light-weight concrete is inferior to normal-weight concrete from the viewpoints of strength, durability and constructivity. Therefore, the light-weight concrete has not been used in construction of infrastructure such as port structures.
　High-performance artificial light-weight aggregate has recently been developed, of which particles contained minute air-voids separately, resulting in lower water absorption. The aggregate enables us to produce high-performance light-weight concrete of which material properties and structural performance are considerably improved compared with the conventional one.
　In this study, the applicability of the high-performance light-weight concrete to port concrete structures was experimentally investigated focusing on weak points of the conventional one. In the experiment, durability of the high-performance light-weight concrete was examined, and structural performance of the light-weight concrete members subjected to shear forces or reversed cyclic forces was compared with that of the normal-weight one. Furthermore, proper methods of compacting and surface-finishing were proposed to prevent the light-weight concrete from segregation, through actual concreting work.