Research on Durability and Strength of Concrete Structures in Ice Sea

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1.Frost Resistance of Concrete in Sea Water Rapid freeze-thaw tests and exposure tests were performed to examine the frost resistance of concrete in sea water. The summary of the results is: (1) As Ca(OH)_2 in concrete is easy to eluviate by the action of sea water, the porosity and the freezable water increase and the development of surface strength is prevented. (2) Scaling damage to coastal and harbor concrete structures is reduced if the air content is 8 percent. (3) Distribution of scaling depth tnd area conforms to the Weible distribution function.2. Strength of Reinforced Concrete After a rapid freeze-thaw test in sea water, an electrolytic corrosion test was carried out to examine the relation between deterioration of concrete and corrosion of reinforcing steel. The summary of the results is: (1) Increasing water cement ratio and cycles of freeze-thaw, the ratio of corrosion of steel and the integrating electric current become greater. (2) The strength of reinforecd concrete decreases about 10 percent by the action of the 300 rapid freeze-thaw cycles.