Research on Durability and Strength of Concrete Structures in Ice Sea

1.混凝土在海水中的抗冻性为考察混凝土在海水中的抗冻性，进行了快速冻融试验和暴露试验。结果表明：(1)由于混凝土中的Ca(OH)2容易被海水淋溶，混凝土的孔隙率和冻结水增大，阻碍了混凝土表面强度的发展。(2)当含气量为8%时，对海岸和港口混凝土结构的结垢破坏减少。(3)结垢深度和面积的分布符合威布尔分布函数。钢筋混凝土的强度在海水中进行快速冻融试验后，进行了电解腐蚀试验，以考察混凝土劣化与钢筋锈蚀的关系。结果表明：(1)随着水灰比和冻融循环次数的增加，钢筋的锈蚀率和积分电流变大。(2)在300次快速冻融循环的作用下，钢筋混凝土的强度下降了约10%。

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.