Print Email Facebook Twitter Possibility of self-healing by using capsules and vascular system to provide water in cementitious materials Title Possibility of self-healing by using capsules and vascular system to provide water in cementitious materials Author Huang, H. Ye, G. Faculty Civil Engineering and Geosciences Department Structural Engineering Date 2013-06-16 Abstract Since self-healing of cracks is able to improve the durability of concrete structures, it has attracted much attention in the recent years. As known, in concrete matrix there are large amounts of cement grains remaining unhydrated, particularly in high performance concrete. Further hydration of these unhydrated cement grains has potential to heal cracks when additional water is available. By now, using capsules or vascular system are the main approaches to supply liquid healing agents inside the materials for self-healing. However, it is still uncertain about the possibility of these two approaches for the supply of water for self-healing in concrete. For this question, self-healing in concrete by using capsules or vascular system to provide water was investigated. Self-healing triggered by water was simulated and consequently, the filling fraction of a crack as a function of healing time was calculated. Moreover, the probability of the crack hitting capsules was calculated as well. Based on this information, the possibility of self-healing by using capsules to provide water was determined. Meanwhile, in the case of using vascular system, ultrasonic pulse velocity measurements were carried out to evaluate the self-healing efficiency in concrete. From the results, it was found that using capsules to supply water for self-healing has very low efficiency. In comparison, the recovery of ultrasonic pulse velocity through the cracked sample can achieve 80% after supplying water for self-healing for 330 hours by vascular system. Thereby, using vascular system to supply water for selfhealing is more feasible than using capsules. Subject self-healingcapsulesvascular systemcementitious materials To reference this document use: http://resolver.tudelft.nl/uuid:45944568-e6b9-4d99-a672-f691ee95056c Publisher Magnel Laboratory for Concrete Research ISBN 9789082073713 Source uuid:3078d20c-2173-4c13-a4d7-106207c78577 Source ICSHM 2013: Proceedings of the 4th International Conference on Self-Healing Materials, Ghent, Belgium, 16-20 June 2013 Part of collection Institutional Repository Document type conference paper Rights (c) 2013 The Author(s) Files PDF Huang_2013.pdf 457.2 KB Close viewer /islandora/object/uuid:45944568-e6b9-4d99-a672-f691ee95056c/datastream/OBJ/view