Reda Mouna A, Chidiac Samir E
Department of Civil Engineering, McMaster University, 1280 Main Street West, Hamilton, ON L8S 4L7, Canada.
Materials (Basel). 2022 Oct 19;15(20):7302. doi: 10.3390/ma15207302.
Encapsulation is a very promising technique that is being explored to enhance the autonomous self-healing of cementitious materials. However, its success requires the survival of self-healing capsules during mixing and placing conditions, while still trigger the release of a healing agent upon concrete cracking. A review of the literature revealed discontinuities and inconsistencies in the design and performance evaluation of self-healing cementitious material. A finite element model was developed to study the compatibility requirements for the capsule and the cementing material properties while the cement undergoes volume change due to hydration and/or drying. The FE results have provided insights into the observed inconsistencies and the importance of having capsules' mechanical and geometrical properties compatible with the cementitious matrix.
封装是一种非常有前景的技术，目前正在探索用其来增强胶凝材料的自主自愈能力。然而，要取得成功，自愈胶囊需要在搅拌和浇筑过程中存活下来，同时在混凝土开裂时仍能触发愈合剂的释放。对文献的综述揭示了自愈胶凝材料在设计和性能评估方面存在的不连贯性和不一致性。开发了一个有限元模型，以研究胶囊与胶凝材料性能的兼容性要求，同时考虑到水泥因水化和/或干燥而发生体积变化的情况。有限元分析结果为观察到的不一致性以及使胶囊的机械和几何性能与胶凝基体相兼容的重要性提供了见解。
