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

点击翻译按钮获取中文摘要

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.