Diagnosis, Preservation and Strengthening System for Concrete Structures in Cold Region

寒地混凝土结构诊断、保存与加固系统

• 批准号: 11450167
• 负责人: SAEKI Noboru
• 金额: $ 5.89万
• 依托单位: HOKKAIDO UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B).
• 财政年份: 1999
• 资助国家: 日本
• 起止时间: 1999 至 2000
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-11450167/
• 关键词: Diagnosis; Preservation; Strengthening; Thermal Analysis; Non-Destructive Test; Freeze-Thaw; 補修・補強; ドリル; 掘削試験

The purpose of this study is initiated to diagnose the situation and develop preservation and strengthening systems for concrete structures in cold region.Actual structures were investigated to consider diagnosis method. Items in place assessment were visual inspection, velocity measurement of ultra sonic, non-destructive strength estimation by Schmidt hammer, depth of carbonation and thickness of cover concrete. The result of this investigation shows the deterioration of concrete structures is evaluated by these non-destructive tests.Excavation test by the drill was carried out for the purpose of estimating the deterioration of depth direction. As the result, the power expressed by the product of drilling speed and the force showed high correlation with the concrete strength.As predicted number of freeze-thaw cycles by thermal analysis corresponds to the strength of non-destructive tests, these tests will be able to apply for the prediction of service life, repairing and strengthening design.Tests for permeability, chloride content, pH and strength are major test methods for the durability assessment. These tests form a system of the diagnosis for concrete structures.The strengthening methods such as painting(surface coating), FRP sheet bonding and external cable are investigated and the effect of strengthening are evaluated, respectively.

本研究以寒区混凝土结构之状况诊断及养护补强系统开发为目的，并以实际结构为研究对象，探讨诊断方法。现场评估项目包括外观检查、超声波速度测量、施密特锤无损强度评估、碳化深度和保护层混凝土厚度。调查结果表明，这些非破坏性试验评估混凝土结构的恶化。挖掘试验的目的是通过钻进行估计的深度方向的恶化。结果表明，钻速与力的乘积所表示的功率与混凝土强度具有很高的相关性，热分析预测的冻融循环次数与无损检测的强度相对应，可用于混凝土的使用寿命预测、修补和加固设计。pH和强度是耐久性评估的主要测试方法。研究了混凝土结构的加固方法，如涂刷（表面涂层）、粘贴FRP片材、体外拉索等，并对加固效果进行了评价。

项目成果

須藤敦史: "寒冷地道路トンネルの断熱材設計における気温変動の推定"土木学会論文集. No.616/VI-42. 103-110 (1999)

Atsushi Sudo：“寒冷地区公路隧道保温设计中的温度波动的估算”日本土木工程师学会论文集第 616/VI-42 号（1999 年）。

H.Sakurai: "Research on RC Structure of Old Communication System for Northern Territory"Proc.of Hokkaido Chapter of the JSCE. No.56(A). 552-557 (2000)

H.Sakurai：“北领地旧通信系统的 RC 结构研究”，JSCE 北海道分会论文集。

M.Shoya: "A Fundamental Study on Development of Rapid Water Permeability Test for Near-Surface Layer of Concrete"Journal of Materials, Concrete Structures and Pavements, JSCE. No.627/V-44. 133-145 (1999)

M.Shoya：“混凝土近表层快速透水性测试开发的基础研究”材料、混凝土结构和路面杂志，JSCE。

Hiroshi Sakurai: "Research of RC Structure Housing an Old Communication System for Northern Territory"Memoirs of The Kitami Institute of Technology. Vol.30No.2. 70-82 (2000)

Hiroshi Sakurai：“北领地旧通信系统的 RC 结构研究”北见工业大学回忆录。

庄谷征美: "コンクリート表層部に着目した簡易透水試験法の開発に関する基礎的研究"土木学会論文集. No.627/V-44. 133-145 (1999)

Masumi Shoya：“针对混凝土表层的简单渗透性测试方法的开发的基础研究”，日本土木工程师学会会刊第 627/V-44 号（1999 年）。