Time dependent micromechanical self-healing model for cementitious material
Abstract: The need for more sustainable systems for construction applications has led researchers to develop a range of self-healing materials for designing or repairing structures. Unsurprisingly, concrete, as the most used construction material, has received considerable attention from the biomimetic research community. Despite much research over the past two decades, there is not yet a comprehensive reliable model for predicting the behaviour of self-healing concrete under a range of conditions. Concrete itself is a complex heterogeneous brittle material that is challenging to simulate. When healing is also considered, its behaviour becomes even more complex. This contribution presents a constitutive model based on a micromechanical formulation, with time dependent cracking and healing functions. The model employs an Eshelbian solution, as well as a range of homogenization techniques, to estimate overall properties and the nonlinear response of self-healing concrete. A key assumption in the formulation is that the new healing material forms in a stress-free state. The initial results show that the mechanical healing efficiency and post-healed response are strongly dependent on the properties of the matrix and healing materials, curing time of the healing agent and the damage threshold at which healing is activated.
Reference of this article: Sina Sayadi, Iulia Mihai and Anthony Jefferson (2021), Self-healing bacterial concrete exposed to freezing and thawing associated with chlorides, Proceedings Resilient Materials 4 Life 2020 (RM4L2020), Maddalena R, Wright-Syed M, (RM4L Eds), pp. 105-109, Cardiff, UK, 20-22 Sep 2021, ISBN 978-1-3999-0832-0
Sina Sayadi, Iulia Mihai and Anthony Jefferson: School of Engineering, Cardiff University, Cardiff CF24 3AA, UK