Integration of Shape-Memory Alloys and Self-Healing Microcapsules to Enhance Concrete Durability
Doctor of Philosophy (PhD)
Engineering Science (Interdepartmental Program)
Self-healing is a term that has not been used for building material until a few decades ago. The concept of developing a material that mimics what living organisms do, such as identify and repair damage, rather than interesting, constitutes a necessity in today’s deteriorated infrastructure. Concrete is one of the main building blocks that support our society’s roads, buildings, and dams. Increasing the service life of such structures will have an important socio-economic benefit in our society. Self-healing methods in concrete have been studied in order to minimize human intervention in maintenance procedures. Previous research in this area has provided different self-healing strategies. These strategies include both internally and externally supplied encapsulation of healing agents, internally supplied microcapsules, expansive agent and mineral admixtures, bacteria, and shape memory materials. The presented research evaluated the self-healing effects of integration of microcapsules and shape memory alloys. The combined self-healing mechanisms in concrete were evaluated by developing a procedure to microencapsulate calcium nitrate and integrating them with Shape Memory Alloy (SMA), as a substitution for conventional steel reinforcement. In order to evaluate the structural behavior and healing efficiency, the initial stiffness, peak strength, and deformation were measured and compared with post-healing measurements. Furthermore, the study conducted crack monitoring in order to evaluate crack-healing over time, This procedure would be followed by performance analysis, using Energy-dispersive X-ray spectroscopy (EDX) in order to quantify the healing components in the cracked areas. Lastly, the current research conducted a life cycle cost analysis, using a probabilistic approach to evaluate the long-term economic efficiencies of self-healing concrete pavements as the competing alternatives to conventional pavements.
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Bonilla, Luis Adolfo, "Integration of Shape-Memory Alloys and Self-Healing Microcapsules to Enhance Concrete Durability" (2017). LSU Doctoral Dissertations. 4344.
Hassan, Marwa Mohamed