ENHANCEMENT OF CHLORIDE RESISTANCE OF PRE-STRESSED CONCRETE SHEET PILE BY BLAST FURNACE SLAG

摘要

Chloride-induced corrosion is one of the main mechanisms of deterioration affecting the long-term performance of concrete structures. In Japan, a large majority of structures are built either near the costal or indirect contact with seawater. The durability of reinforced or pre-stressed concrete structure depends on the resistance of concrete to chloride penetration. Naturally concrete provides physical and chemical protection to the reinforcing steel from chloride penetrating. The chloride resistance depends on the permeability of concrete and the cover thickness of the reinforcement. High strength concrete (HSC) is seemed to be one of solutions to achieve low permeability and high durability. In addition, partial replacement of cement by blast furnace slag (BFS) in producing HSC has been established. This paper discusses the various factors affecting chloride resistance of concrete after long term exposure under marine tidal environment.