Research on Durability and Strength of Concrete Structures in Ice Sea

冰海混凝土结构耐久性与强度研究

• 批准号: 62550343
• 负责人: AYUTA Koichi
• 金额: $ 1.34万
• 依托单位: Kitami Institute of Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1987
• 资助国家: 日本
• 起止时间: 1987 至 1988
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-62550343/
• 关键词: Ice Sea; Marine Concrete; Durability; Strength; Frost Resistance; Sea Water Resistance; Air Content; 空気量

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.

1.通过快速冻融试验和暴露试验研究了海水中混凝土的抗冻性。结果表明：（1）由于海水的作用，混凝土中的Ca（OH）_2易溶出，孔隙率和可冻水增加，阻碍了混凝土表面强度的发展。(2)如果空气含量为8%，则海岸和港口混凝土结构的结垢损害减少。(3)结垢深度和结垢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，进行电解腐蚀试验，以检查混凝土劣化与钢筋腐蚀之间的关系。结果表明：（1）随着水灰比和冻融循环次数的增加，钢筋锈蚀率和累积电流增大。(2)在300次快速冻融循环作用下，钢筋混凝土强度下降约10%。

项目成果

桜井宏: セメント技術年報. 41. 379-382 (1987)

樱井宏：水泥技术年度报告。41. 379-382 (1987)

Koichi AYUTA.: Low Temperature Effects on Concrete. 1. 37-65 (1988)

Koichi AYUTA.：低温对混凝土的影响。

桜井宏: 寒地技術シンポジウム. 3. 473-476 (1987)

樱井宏：寒冷地区技术研讨会。3. 473-476 (1987)

Koichi AYUTA: "Frost Resistance of Concrete Exposed to Sea Water" Low Temperature Effects on Concrete. 1. 37-65 (1988)

Koichi AYUTA：“暴露于海水中的混凝土的抗冻性”低温对混凝土的影响。

桜井宏: 土木学会北海道支部論文報告集. 45. 605-610 (1989)

Hiroshi Sakurai：日本土木工程师学会北海道分会论文集，45. 605-610 (1989)。