Analytical models for self-healing of cracks via geometrical probability: application to cementitious materials

Author(s): Zhong Lv, Huisu Chen
Paper category: Conference
Book title: 2nd International conference on Microstructural-related Durability of Cementitious Composites
Editor(s): Guang Ye, K. Van Breugel, Wei Sun, Changwen Miao
Print ISBN: 978-2-35158-129-2
e-ISBN: 978-2-35158-123-0
Publisher: RILEM Publications SARL
Pages: 1044 - 1053
Total Pages: 9
Language: English

Abstract: 
For practical crack patterns caused by different types of mechanisms two simplified crack patterns are presented as examples to investigate the self-healing including autonomic healing and autogenous healing in materials. From the viewpoint of geometrical probability, one analytical model is developed to obtain the suitable dosage of capsules for autonomic healing in materials, and the other one is developed to characterize the healing efficiency of rehydration of remaining unhydrated cement nuclei for autogenous healing in cementitious materials. The autonomic healing technology dealt with in this paper is based on use of capsules, which contain the healing agent or nutrients for bacteria, and are embedded in the matrix of materials. The strategies developed are generic and can be applied to other cases in which the capsules are incorporated. Based on a specific crack pattern for autogenous healing, the self-healing efficiency model has quantitatively considered the influence of the volume fraction and particle size distribution of unhydrated cement nuclei which are randomly dispersed in cementitious materials. Finally, the reliability of these theoretical solutions from proposed models is verified via computer simulation.

Online publication: 2013
Publication Type: full_text
Public price (Euros): 0.00