Modeling and re-corrosion evaluation of patch repaired concrete subjecting to chloride attack

遭受氯化物侵蚀的修补混凝土的建模和再腐蚀评估

• 批准号: 19K04547
• 负责人: 欒 堯
• 金额: $ 2.83万
• 依托单位: Saitama University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2019
• 资助国家: 日本
• 起止时间: 2019-04-01 至 2024-03-31
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-19K04547/
• 关键词: patch repaired concrete; chloride; water repellency; crack; corrosion; multi-scale model; chloride migration; blast furnace slag; water repellent agent; water penetration; silica fume; repair mortar; electrophoresis; capillary absorption; SH

In FY2022, water penetration and chloride migration of repair materials that were treated with water repellent agents, as well as their shrinkage and strength properties, were studied experimentally. The results indicated that the combination of hydrophobic treatment with repair materials effectively improved water and chloride penetration resistance under cracked conditions. Shrinkage was also reduced for treated repair materials, but the reduction of strength still remains an issue that needs to be solved in the future. In addition, bond strength of repair material and concrete substrate was also tested with different interfacial treatment and concrete removal technology. For the steel corrosion of patch repaired concrete, the influence of crack width in repair materials has also been tested. It was found that corrosion degree increased with increasing crack width, which accelerated chloride penetration significantly.

2022财年，对经过防水剂处理的修复材料的水渗透和氯离子迁移以及它们的收缩和强度性能进行了实验研究。结果表明，疏水处理与修复材料的结合有效提高了裂缝条件下的抗水和氯化物渗透能力。经过处理的修复材料的收缩率也有所降低，但强度的降低仍然是未来需要解决的问题。此外，还测试了不同界面处理和混凝土去除技术下修补材料与混凝土基材的粘结强度。对于修补混凝土的钢筋腐蚀，还测试了修补材料中裂缝宽度的影响。研究发现，腐蚀程度随着裂纹宽度的增加而增加，这显着加速了氯化物的渗透。

项目成果

Study of hydration and chloride binding properties of slag-blended cement with different blending ratios

不同掺合比矿渣掺混水泥水化及氯离子结合性能研究

• 发表时间: 2020
• 作者: Fahmida Parvin;Yao Luan;Asiya Nurhasanah Habirun
• 通讯作者: Asiya Nurhasanah Habirun

ひび割れを有するコンクリートの塩化物イオン実効拡散係数に関する実験的研究

含裂缝混凝土中氯离子有效扩散系数试验研究

• 发表时间: 2022
• 作者: K. Iwai;H. Takaku;M. Miyagi;Y. W. Shi;X. S. Zhu;Y. Matsuura;周シン，欒堯，王眺，Satya Medepalli，鄭宇倩
• 通讯作者: 周シン，欒堯，王眺，Satya Medepalli，鄭宇倩

Experimental study on mortar with the addition of hydrophobic silicone oil for water absorption, strength, and shrinkage

• DOI: 10.1016/j.conbuildmat.2023.130323
• 发表时间: 2023-02
• 期刊: Construction and Building Materials
• 影响因子: 7.4
• 作者: Y. Luan;S. Asamoto

Study on chemical and physical chloride binding of slag blended cement with different replacement ratios

不同替代率矿渣掺合水泥的化学和物理氯离子结合研究

• 发表时间: 2022
• 作者: Yao Luan;Fahmida Parvin
• 通讯作者: Fahmida Parvin

A multi-scale approach for simulation of capillary absorption of cracked SHCC based on crack pattern and water status in micropores

• DOI: 10.1617/s11527-021-01664-3
• 发表时间: 2021-03
• 期刊: Materials and Structures
• 影响因子: 3.8
• 作者: Y. Luan;T. Ishida