温度促進試験によるコンクリート中の鉄筋の腐食について : (<特集>建設材料特集号)

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Many structures have been constructed and used in marine environment. When properly designed and constructed, reinforced concrete is the most suitable material for a wide range of sea structures. However, the electrochemical corrosion of reinforcing steel which endangers the durability and safety of concrete sea structures is the most critical problem. In analyzing the corrosion of reinforcing steel embedded in concrete, the most reliable method is to test the reinforcing steel in actual conditions that the structures would be exposed to. However, the method takes a very long time to obtain the test results. In order to shorten the time of testing, accelerated corrosion tests under raised temperature and under high humidity have been performed in the present study. As a result, the accelerated test is proven to be very effective. Influences of salt concentration in mixing water, of crack width in covering concrete, and of surface condition of reinforcing steel, on the corrosion were investigated. The results of the tests are summarized as follows ; (1) At raised temperatures ranging from 40℃ to 60℃, the time needed to corrode reinforcing steel embedded in concrete becomes much shorter than that at normal temperature. The accele-rated method of testing is very effective in shortening the time of testing. (2) The amount of corrosion of reinforcing steel embedded in concrete was estimated from the ratio of the corroded surface area to the total surface area. Cracks narrower than 0.06mm did not give any distinct influence on the whole corrosion except just around the cracks. (3) The corroded area of embedded steel was much larger on the lower surface than on the upper surface.
社団法人日本材料学会の論文
1977-11-15

温度促進試験によるコンクリート中の鉄筋の腐食について : (<特集>建設材料特集号)

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