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This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License
Article
Author(s)
Nobuaki Otsuki1, Aung Kyaw Min2, Tomohiro Nagata1 and Cheng Yi1
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DOI:10.17265/1934-7359/2016.05.006
Affiliation(s)
1. Department of International Development Engineering, Tokyo Institute of Technology ,Tokyo 152-8552, Japan
2. Civil Engineering Unit, Chiyoda Corporation, Yokohama 230-0077, Japan
ABSTRACT
Using seawater in concrete can be considered as one of the sustainable approaches in construction industry not only to save the freshwater resource but also to promote the use of abandoned seawater resource, especially in the construction at the uninhabited area close to the sea where the procurement of fresh water is difficult. In this study, durability against chloride attack of seawater mixed concrete with different replacement ratio of BFS (blast furnace slag) and FA (fly ash) is discussed and the life time until the occurrence of corrosion crack is evaluated. The results show that: (1) Chloride penetration rate of seawater mixed specimens with BFS and FA is lower than that of freshwater mixed OPC (ordinary Portland cement) specimens; (2) Oxygen permeability of seawater mixed specimens with BFS and FA is almost the same or lower than that of freshwater mixed OPC specimens; (3) Total life time (corrosion incubation period and propagation period) of seawater mixed specimens with BFS and FA is almost the same or only slightly shorter than that of freshwater mixed OPC specimens. From the results, it was confirmed that the usage of seawater in concrete mixing is feasible in concrete with the appropriate BFS and FA replacement ratio.
KEYWORDS
Seawater, chloride attack, corrosion, durability of concrete, blast furnace slag, fly ash.
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