A multi-scale approach for modeling self-healing concrete by coupling water ingress and crack healing process

通过耦合进水和裂缝愈合过程来模拟自修复混凝土的多尺度方法

• 批准号: 22K04257
• 负责人: 欒 堯
• 金额: $ 2.66万
• 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: 2022
• 资助国家: 日本
• 起止时间: 2022-04-01 至 2025-03-31
• 项目状态: 未结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-22K04257/
• 关键词: self-healing; crack; water penetration; multi-scale model; bacteria; polyvinyl alcohol fiber; water ingress; multi-scale modeling

In FY2022, a multi-scale model coupling water penetration and the self-healing process was established. The water penetration process was integrated with three processes, water penetration in matrix and cracks, respectively, and water absorption from crack to matrix. The crack healing process was tentatively modeled in relation to elapsed time and initial crack width. The numerical analysis using the multi-scale model can qualitatively simulate the gradual crack healing process with drying-wetting cycles, resulting in a gradual increase in water resistance. The process was visualized using two-dimensional contours reasonably.In addition, self-healing experiment was performed using two different technologies: the application of bacteria and polyvinyl alcohol (PVA) fibers, respectively. The crack healing process was observed periodically by recording crack width changes. Water absorption test was also performed before and after self-healing, exhibiting reduced accumulative water in the specimens.

FY2022建立了耦合水渗透与自愈过程的多尺度模型。水渗透过程包括三个过程，分别是水在基质中的渗透和裂缝中的渗透，以及从裂缝到基质的吸水。初步建立了裂缝愈合过程与时间和初始裂缝宽度的关系模型。采用多尺度模型进行数值分析，可以定性地模拟裂缝随干湿循环逐渐愈合的过程，从而导致水阻力逐渐增大。利用二维轮廓合理地实现了该过程的可视化。此外，还分别采用细菌和聚乙烯醇（PVA）纤维两种不同的技术进行了自修复实验。通过记录裂缝宽度的变化，周期性地观察裂缝的愈合过程。在自愈前后进行了吸水试验，表明试样中累积水分减少。