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Reactive powder concretes (RPC) with redispersible polymer powders
Ondrůšková, Nela ; Másilko, Jiří (referee) ; Šoukal, František (advisor)
The thesis entitled "Reactive Powder Concretes (RPC) with Redispersible Powder Polymers" deals with the description, design and development of a material with increased ballistic resistance, i.e. with increased resistance to high-speed dynamic stresses due to interaction with a projectile. The high mechanical properties of RPC are achieved mainly by reducing the water coefficient, using a large dose of superplasticizers and high strength aggregates to achieve the densest possible structure. The aim of this work is to investigate the effect of addition of redispersible powder polymer to RPC composite and to find the optimum type and amount of polymer to form a co-matrix, thus improving material properties such as flexural tensile strength and toughness. The preparation, procedure and processing of each formulation are described in each chapter, and the properties of these materials and observations of their behaviour under ballistic loading are described. Experimentally, the thesis focused on monitoring the effect of polymer type and amount, particularly on the change in bulk density and on compressive and flexural tensile strength. The results obtained for the different formulations were compared with each other and related to a reference. SEM analysis was performed to monitor the polymer film formation in the matrix. Based on the tests, two formulations with the best comprehensive properties were selected. These two formulations were subjected to DOP ballistic test.
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