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Smart additives for self-sealing and self-healing concrete Vrije Universiteit Brussel
Smart additives for self-healing and self-healing concrete Universiteit Gent
Like broken bones are able to heal themselves, it would be desirable that damaged concrete may be repaired autonomously as high costs are related to the repair. Actually, concrete already has some self-healing properties; when cracks appear, water enters and reacts with unhydrated cement grains which results in crack healing. However, only small cracks can be healed in this way. Therefore, we want to improve the self-healing efficiency by ...
Evaluation of the efficiency of self-healing in concrete by means of µ-CT Universiteit Gent
It has been estimated that, in Europe, 50 % of the annual construction budget is spent on refurbishment and remediation of the existing structures. Therefore, self-healing of concrete structures, which are very sensitive to cracking, would be highly desirable. In this research, encapsulated healing agents were embedded in the concrete matrix in order to obtain self-healiing properties. Upon crack appearance, the capsules break and the healing ...
Self-healing materials are coming of age Universiteit Gent
While natural materials such as bone or skin are able to heal themselves in an autonomous manner after mechanical damage, traditional man-made materials generally lack this intrinsic capacity for self-healing. In 1969, self-healing properties were for the first time built-in inside polymeric materials[1] and in the following decades publications about self-healing in thermoplastic and cross-linked systems and concrete appeared.[2] Although, it ...
Self-healing and high interfacial strength in multi-material soft pneumatic robots via reversible Diels-Alder bonds Vrije Universiteit Brussel
In new-generation soft robots, the actuation performance can be increased by using multiple materials in the actuator designs. However, the lifetime of these actuators is often limited due to failure that occurs at the weak multi-material interfaces that rely almost entirely on physical interactions and where stress concentration appears during actuation. This paper proposes to develop soft pneumatic actuators out of multiple Diels-Alder ...
Investigation of the self-healing properties of shape memory polyurethane coatings with the ‘odd random phase multisine’ electrochemical impedance spectroscopy Vrije Universiteit Brussel
The aim of this work is to study the physical self-healing properties of shape memory polyurethanes (SMPUs) with cerium ions on top of a pure aluminum substrate. To achieve this, the 'odd random phase multisine' electrochemical impedance spectroscopy (EIS) is used. The additional information given by this technique (stochastic noise, non-linear and non-stationary behavior of the sample during the measurement) has been useful to verify the ...
Crack propagation in micro-encapsulated polymer for self-healing: numerical modelling and experimental validation Universiteit Gent
Self-healing materials are currently in several areas of research, from polymers to cementitious materials. These smart materials have the ability to repair damage caused by mechanical usage, such as cracks, avoiding or delaying the mechanical failure. Although self-healing materials are very attractive for several applications, it is important to know pros and cons. We have numerically studied the crack propagation in homogenous and ...
Designing flexible and self-healing electronics using hybrid carbon black/nanoclay composites based on Diels-Alder dynamic covalent networks Vrije Universiteit Brussel
The addition of an organo-modified nanoclay to a carbon black-based electrically conductive self-healing composite showed a synergistic improvement of the electrical conductivity and healing ability. The synergistic effect was studied as a function of carbon black (primary) and nanoclay (secondary) filler loadings in a Diels-Alder-based polymer network. The synergistic effect is greatest when the carbon black particles are organized around the ...
Non-destructive evaluation of ductile-porous versus brittle 3D printed vascular networks in self-healing concrete Universiteit Gent Vrije Universiteit Brussel
Additive manufacturing (AM) can produce complex vascular network configurations, yet limited testing has been done to characterize the damage and healing behavior of concrete with embedded networks for self-healing. In this study, different AM methods and network wall materials were used to produce vascular networks for self healing concrete prisms, where their load-response behavior, healing efficiency and microstructure were evaluated using ...