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Study of the possibilities of using superabsorbent additives in concrete
Kubíček, Matyáš ; Jančář,, Josef (referee) ; Hela, Rudolf (advisor)
This bachelor's thesis deals with the study of self-healing of cracks in cement composites. In the theoretical part, four chapters describe the mechanisms that influence the durability of concrete or can extend it. In the first chapter, I deal with concrete additives that affect the water consumption in concrete. This chapter is focused on plasticizers. In the second chapter, I deal with the treatment of concrete, how long to treat it and what are the ways of treating it. In the third chapter, I write about rehabilitation, about the additional life extension of building structures using various technologies and mechanisms. The fourth and last chapter of the theoretical part is the most comprehensive and discusses the self-healing mechanisms of concrete with the help of several types of microorganisms that heal cracks with their products. Then about calcium lactates, which are often combined with microorganisms to improve the effects of self-healing. About non-metallic polymer fibers, both natural and synthetically produced, added to concrete to improve properties. In the last subsections, I mention the use of colloidal SiO2 solutions and especially superabsorbent polymers, the investigation of which plays a significant role in this thesis. In the experimental part, the influence of the amount of superabsorbent additive in concrete on the ability of self-healing is investigated. The ability to heal cracks, which will be artificially created after mixing the concrete mixture, when placing the concrete in the forms, is investigated. Furthermore, the influence of the effect of the superabsorbent additive in different deposits will be investigated. Subsequently, the samples will be tested for tensile strength after bending and compressive strength.
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