Electromigration of Material in concrete and Damage Mechanism of structures

混凝土中材料的电迁移与结构损伤机理

• 批准号: 05402044
• 负责人: NAGATAKI Shigeyoshi
• 金额: $ 13.31万
• 依托单位: TOKYO INSTITUTE OF TECHNOLOGY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (A)
• 财政年份: 1993
• 资助国家: 日本
• 起止时间: 1993 至 1995
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-05402044/
• 关键词: Electrical cell; Mobility; Flux; Electromigration of ion; Transition zone between aggregate and matrix; イオンの移動; 拡散; 内部組織; 骨材ペースト界面; 界面; 材齢; アルカリ骨材反応; 内部電極法; 外部電極法; 混和材料; 細孔径

As the summary of this study, following concluding remarks were clarified ;(1)As for the influence of characteristics of hardened matrix on electromigration of ions, (1)the electromigration of ion are little with decrease in water to cement ratio and (2)the electromigration of ion are little in concrete with mineral admixtures.(2)As for the influence of current application and kinds of solution on electromigration of ions, ( 1)when current density is 0.1A/cm^2, flux of movement is similar to diffusion, (2)the electromigrations are different between by anodic ion and by cathodic ion and (3)the density of OH in solution influences to the electromigration of ions.(3)As for the influence of transition zones between matrix and aggregate on the electromigration of ion, (1)the electromigration of ion is little with decrease in sand to cement ratio and G/C and (2)the electromigrations of ion are influenced from transition zones between matrix and aggregate. In particular, (1)the electromigration of ion is large through the transition zone between sand and matrix. While, that is little between coarse aggregate and matrix.(4)As for the relation ship between electromigration and diffusion of ions, when same binders are used and environments are constant, there are good relation ship between electromigration and diffusion.(5)As for the relation ship between damaged mechanism of structures the electromigration of ion, chloride ions through carbonated cement matrix moves easier than that through noncarbonated matrix. Further, movement of chloride ion is difficult when ion contents in pore solution in matrix are large.

作为本研究的总结，得到以下结论：（1）硬化基质特性对离子电迁移的影响：（1）随着水灰比的减小，离子电迁移量减小;（2）掺矿物掺合料混凝土中离子电迁移量减小。(2)As在电流密度为0.1A/cm ^2时，离子的迁移过程与扩散过程相似; 2阳极离子和阴极离子的迁移过程不同; 3溶液中OH的浓度对离子的电迁移有影响。(3)As基质-集料过渡区对离子电迁移的影响：（1）随着砂灰比和G/C的减小，离子的电迁移很小;（2）基质-集料过渡区对离子的电迁移有影响。特别是（1）通过砂-基质过渡带的离子电迁移较大。而粗骨料与基质之间的渗透性很小。(4)As对于电迁移与离子扩散之间的关系，在相同的粘结剂和相同的环境条件下，电迁移与离子扩散之间存在着良好的关系。(5)As从结构的破坏机理看，离子、氯离子在碳化水泥基体中的电迁移比在非碳化水泥基体中的电迁移容易。此外，当基质中孔隙溶液中的离子含量较大时，氯离子的移动是困难的。

项目成果

A.MORIWAKE,S.NAGATAKI,N.OTSUKI and N.MIURA: "Evaluation of the effect of surface coatings through the diffusion process of chloride ion in concrete" Journal of materials, concrete structures and pavements. No.520. 111-122 (1995)

A.MORIWAKE、S.NAGATAKI、N.OTSUKI 和 N.MIURA：“通过氯离子在混凝土中的扩散过程评估表面涂层的效果”《材料、混凝土结构和路面》杂志。

M.HISADA,N.OTSUKI,S.NAGATAKI And S.FUJIKURA: "A study on various influencing factors for Electric migration through mortar" Proceedings of the JAPAN Concrete institute. Vol.17, No.1. 907-912 (1995)

M.HISADA、N.OTSUKI、S.NAGATAKI 和 S.FUJIKURA：“通过砂浆电迁移的各种影响因素的研究”日本混凝土研究所会议录。

久田真,大即信明,長滝重義,藤田洋,呉承寧: "モルタル中におけるイオンの電気的移動に及ぼす電流密度および混和材の影響" 土木学会第49回.年次学術講演会講演概要集V. 49. 390-391 (1994)

Makoto Hisada、Nobuaki Ohsoku、Shigeyoshi Nagataki、Hiroshi Fujita、Chengning Wu：“电流密度和掺合料对砂浆中离子电运动的影响”第 49 届日本土木工程学会学术年会摘要 V. 49。 390-391 (1994)

N.OTSUKI,S.NAGATAKI and M.HISADA: "Movement of ions through mortar mixed with mineral admixtures" 5^<th> CANMET/ACI international conference on Fly Ash, Silica Fume, Slag and Natural Pozzolans in Concrete. 297-313 (1995)

N.OTSUKI、S.NAGATAKI 和 M.HISADA：“离子通过与矿物掺合料混合的砂浆的运动”第 5 届 CANMET/ACI 国际会议，内容涉及混凝土中的粉煤灰、硅灰、矿渣和天然火山灰。

N.OTSUKI,M.HISADA and T.AMINO: "Electric current and ion migration through concrete" Proceedings of the regional symposium on Infra-structure development in civil engineering. 21-35 (1995)

N.OTSUKI、M.HISADA 和 T.AMINO：“通过混凝土的电流和离子迁移”土木工程基础设施发展区域研讨会论文集。