Abstract
Cementitious composites with microencapsulated healing agents are appealing due to the advantages of self-healing. The polymeric shell and polymeric healing agents in microcapsules have been proven effective in self-healing, while these microcapsules decrease the effective elastic properties of cementitious composites before self-healing happens. The reduction of effective elastic properties can be evaluated by micromechanics. The substantial complicacy included in micromechanical models leads to the need of specifying a large number of parameters and inputs. Meanwhile, there are nonlinearities in input–output relationships. Hence, it is a prerequisite to know the sensitivity of the models. A micromechanical model which can evaluate the effective properties of the microcapsule-contained cementitious material is proposed. Subsequently, a quantitative global sensitivity analysis technique, the Extended Fourier Amplitude Sensitivity Test (EFAST), is applied to identify which parameters are required for knowledge improvement to achieve the desired level of confidence in the results. Sensitivity indices for first-order effects are computed. Results show the volume fraction of microcapsules is the most important factor which influences the effective properties of self-healing cementitious composites before self-healing. The influence of interfacial properties cannot be neglected. The research sheds new light on the influence of parameters on microcapsule-contained self-healing composites.
Highlights
Self-healing is the remarkable ability of living organisms to repair their own damage by themselves.Inspired from nature, the great challenge now is to create and develop composites with high potential for self-healing, offering alternatives to the current options and moving toward materials with extended service lifetime for various applications
Thestudy study presents the results of sensitivity analysis using onmicromechanical the proposed model of microcapsule-contained self-healing cementitious composites
Parameters aretorequired knowledge improvement to achieve the desired level of confidence the Extended Fourier Amplitude Sensitivity Test (EFAST) helps identifyfor which parameters are required for knowledge improvement to achieveinthe results
Summary
Self-healing is the remarkable ability of living organisms to repair their own damage by themselves. Micromechanical model which can which reflect can the properties pothole patching material is method,. It does not apply to microcapsule-contained composites directly since it ignores material is proposed. Mechanical properties self-healing of the microcapsule-contained self-healing cementitious composite at the the interfaces should be [26]. A micromechanical model which can consider structure of microcapsules has notand been both the interfacial performance thebuilt. A new micromechanical model of the microcapsule-contained self-healing reduce uncertainty and get better estimates on specific parameters of the model. A new micromechanical model of the microcapsule-contained self-healing. The sensitivity analysis of the model was conducted using this paper is as follows.
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