Assessment of Residual Life of Coastal Concrete Structures

沿海混凝土结构剩余寿命评估

• 批准号: 63850106
• 负责人: FUJITA Yoshio
• 金额: $ 2.37万
• 依托单位: Hokkaido University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Developmental Scientific Research
• 财政年份: 1988
• 资助国家: 日本
• 起止时间: 1988 至 1989
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-63850106/
• 关键词: Reinforced Concrete; Corrosion; Salt Damage; Chlorine Ion; Neutralization; Cover Thickness; Fatigue Test; Residual Life; コンクリート構造物; 縦ひびわれ; 疲労強度

This paper describes the assessment and control of life for coastal concrete structures to maintain the security and improvement for infrastructure. Based on the accelerated test for corrosion,surveying field and fatigue test,the following results may be drawn.The cracking index may be applied to control rust damage in the concrete structures. It is found that the allowable stress for reinforcing bars corresponds to the cover thickness and the high quality of the tensile strain of the concrete cover is effective in preventing corrosion.In a severe corrosive environment,the rust damage occurs rarely if the stress in reinforcing bars is less than (36C+8)MPa (C is the cover thickness in cm).Similarly in an ordinary corrosive environment,the concrete is not susceptible to rust damage if the stress is less than (56C+8)MPa.The fatigue strength and number of reinforced concrete beans with longitudinal crack due to rust damage are obtained and the residual life of reinforced concrete beams damaged by corrosion is estimated.

本文介绍了沿海混凝土结构的寿命评估和控制，以维护基础设施的安全和改善。通过加速腐蚀试验、现场调查和疲劳试验，得出以下结论：混凝土开裂指数可用于控制混凝土结构的锈蚀破坏。结果表明，钢筋的许用应力与保护层厚度相对应，保护层的高质量拉应变对防止锈蚀是有效的，在严重腐蚀环境中，钢筋应力小于（36 C +8）MPa时，锈蚀破坏很少发生（C为覆盖层厚度，单位为cm），同样在普通腐蚀环境下，应力小于（56 C +8）时，混凝土不易生锈损坏得出了锈蚀损伤后钢筋混凝土梁的疲劳强度和疲劳条数，并对锈蚀损伤后钢筋混凝土梁的剩余寿命进行了分析。估计腐蚀。

项目成果

N.Saeki: "Control of Rust Damage of Reinforced Concrete in a Corrosive Environment" Concrete in Marine Environment Pro. 2nd International Conference, ACI. Sp-109. 163-177 (1988)

N.Saeki：“腐蚀环境中钢筋混凝土锈蚀的控制”海洋环境中的混凝土Pro。

高田宣之: "沿岸コンクリ-トの塩分濃度と中性化" 土木学会年次学術講演会概要集. 45. (1990)

Nobuyuki Takada：“沿海混凝土的盐度和中和”日本土木工程师学会年度学术会议摘要45。（1990）。

佐伯昇: 土木学会年次学術講会概要集. 44. (1989)

佐伯登：日本土木工程学会年度学术会议摘要集 44。（1989）。

佐伯昇: "鉄筋腐食による縦ひびわれを有するRC桁の疲労耐力" 土木学会年次学術講演会概要集. 45. (1990)

Noboru Saeki：“由于钢筋腐蚀而产生纵向裂缝的 RC 梁的疲劳强度”日本土木工程学会年度学术会议摘要 45。（1990）。

N.Saeki: "Control of Rust Damage of Reinforced Concrete in a Corrosive Environment" American Concrete Institute, Sp-109, pp.163-177, 1988.

N.Saeki：“腐蚀环境中钢筋混凝土锈蚀的控制”美国混凝土协会，Sp-109，第 163-177 页，1988 年。