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Laser Welded Rail ZnNi Coating Adhesive Strength Evaluation
Flieger, Vít ; Skrutek, Ivo (referee) ; Ramík, Pavel (advisor)
The aim of this bachelor thesis is drafting and testing of methods for evaluation of adhesive strength ZnNi coating on laser welded rail. In individual parts is descriped function of common rail system focusing on high pressure tray – rail. Then are described several methods for evaluation of adhesive strength. Theree methods are selected to testing on rail. The experimental part describe the resutls of this tests and modifications for better results. In the last is chosen one method with best results and is complied draft of specification for this method.
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Elastomer fillers as a potential raw material for concrete and mortar products
Jankech, Filip ; Balog, Oliver (referee) ; Bodnárová, Lenka (advisor)
To attain a sustainable development in the field of building materials, it is necessary to consider environmental, economic, and social aspects of the industrial production. This thesis addresses the first two aspects. Both theoretical and practical research were implemented in order to study the possibility to replace the commonly used RDPs, that are being used in the dry-mix mortar industry as a primary additive, with the industrially processed elastomer waste materials, such as recycled tire rubber. The review of the scientific literature processed within the theoretical research discloses the state of the art in the field of polymer modification of the mortar products and the effect of the commonly used modifiers and elastomer fillers on the performance of mortar and concrete products. The experimental research was implemented to study the possibility of the replacement of the RDPs for the elastomer fillers. The performance of fresh and hardened mortar containing various amounts of elastomer particles was studied. The results indicate, that the partial replacement could be feasible without worsening the performance of the product.
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Influence of Water-Retentive Admixtures on the Adhesive Strength of Mortars
Žižlavský, Tomáš
The article studies the influence of viscosity-modifying admixtures with water-retentive function on the adherence of natural hydraulic lime-based mortars to traditional fired-clay brick substrate. The substrate was either dried or water-saturated. High water retention value and water/binder ratio led to inferior performance while applied on saturated substrate. On the other hand those properties were found beneficial on the dried substrate. The failure in the mortar during the pull-off test is far more common while the mortars are applied on dried substrate. Each of the admixtures studied proved to be useful in improving the performance of the mortar in at least one of the studied conditions.
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Laser Welded Rail ZnNi Coating Adhesive Strength Evaluation
Flieger, Vít ; Skrutek, Ivo (referee) ; Ramík, Pavel (advisor)
The aim of this bachelor thesis is drafting and testing of methods for evaluation of adhesive strength ZnNi coating on laser welded rail. In individual parts is descriped function of common rail system focusing on high pressure tray – rail. Then are described several methods for evaluation of adhesive strength. Theree methods are selected to testing on rail. The experimental part describe the resutls of this tests and modifications for better results. In the last is chosen one method with best results and is complied draft of specification for this method.
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Elastomer fillers as a potential raw material for concrete and mortar products
Jankech, Filip ; Balog, Oliver (referee) ; Bodnárová, Lenka (advisor)
To attain a sustainable development in the field of building materials, it is necessary to consider environmental, economic, and social aspects of the industrial production. This thesis addresses the first two aspects. Both theoretical and practical research were implemented in order to study the possibility to replace the commonly used RDPs, that are being used in the dry-mix mortar industry as a primary additive, with the industrially processed elastomer waste materials, such as recycled tire rubber. The review of the scientific literature processed within the theoretical research discloses the state of the art in the field of polymer modification of the mortar products and the effect of the commonly used modifiers and elastomer fillers on the performance of mortar and concrete products. The experimental research was implemented to study the possibility of the replacement of the RDPs for the elastomer fillers. The performance of fresh and hardened mortar containing various amounts of elastomer particles was studied. The results indicate, that the partial replacement could be feasible without worsening the performance of the product.
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