해양 콘크리트의 배합개선 및 염해 내구성 연구

Abstract

Marine concrete are exposed to a combination of physical attacks such as chemical attack from the inflow of chloride and sulfate ions from the shore, wave power, wind power, wet-dry repeat. In especially, chloride attack significantly reduce the performance of the marine concrete by causing reinforcement corrosion in concrete. The penetration capacity of chloride ions depends on the micro structure of hardened concrete, such as the continuity of pore paths and micro cracks. Therefore, durable structure are made from dense conctrte by increasing the resistance against chloride invasion and restricting the formation of harmful cracks through proper measures regarding the material and construction processes. Many regulations and codes suggest guidelines for mix conditions, including a cementitious material system for concrete exposed to chloride attack environments. It is clear that choosing the optimum composition of cementitious material is a key issue when designing a marine concrete. Therefore, a solution for marine concrete has to be established taking into consideration of chloride attacks. In this study, the materials properties of marine concrete considering binder type are experimentally investigated. To achieve the study objective, the basic property evaluation was conducted for all materials used in mixing design. Moreover, it was tested, time of setting, length change, compressive strength, rapid chloride ions penetration diffusion. Keywords: chloride attack, reinforcement corrosion, durability, time of setting, length change, rapid chloride ions penetration diffusion.