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Possibility of Sea Water as Mixing Water in Concrete



Author(s)

Nobuaki Otsuki1, Tsuyoshi Saito2 and Yutaka Tadokoro3

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DOI:10.17265/1934-7359/2012.10.002

1. Department of International Development Engineering, Tokyo Institute of Technology, Tokyo 152-8552, Japan
2. Department of Civil Engineering and Architecture, Niigata University, Niigata 950-2185, Japan
3. Nippon Steel ＆ Sumikin Stainless Steel Corporation, Hikari 743-8550, Japan

In the near future, fresh water will be very difficult to get and scarce. It is said that in 2025 half of the mankind will live in
the areas where fresh water is not enough. Also, UN and WMO (World Meteorological Organization) are predicting five billion people will be in short of even drinking water. Also, in the present, there are some areas where sea water or chloride contained sand are used as mixing water with or without intension. The authors believe that the possibilities of using sea water as mixing water in concrete should be investigated seriously. In this paper, the authors would like to show various possibilities of using sea water as mixing water in RC (reinforced concrete) members. The possibilities are shown as follows: (1) mixed with pozzolanic materials (Blast furnace slag powder, etc.) expecting to fix the free chloride ion; (2) Mixed with corrosion inhibitor; (3) reinforced with stainless steel or corrosion resistant reinforcement; and (4) used in very dry or submerged conditions.

Sea water, blast furnace slag, corrosion behavior, stainless steel, hydration products.