Research on Resistance of Concrete to Seawater
The characteristics of concrete specimens immersed in seawater for 10 years were investigated. In general, concrete immersed in seawater expanded more than in case of standard curing (20°C in fresh water), and it was estimated that expansion would progress even after 10 years. The compressive strength of Portland cement concrete immersed in seawater was lower at 10 years than 3 years, but did not decline very much with blended cement concrete. However, all seawater-immersed specimens were of lower compressive strengths than specimens with standard curing. Surface deterioration of specimens in surface appearance and compressive strength were unrelated. According to the results of chemical analyses of the concretes, the surface portions and the interiors were of different compositions with MgO, SO3, and Na2O plentiful at the surface portions with CaO conversely small in quantity. As for Cl, it had penetrated to the centers of the specimens.
KeywordsCompressive Strength Portland Cement Concrete Specimen Cement Concrete Blended Cement
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