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Decay of granites used for ashlar masonry in arch bridges
Mach, Kryštof ; Přikryl, Richard (advisor) ; Matějka, Dobroslav (referee)
This thesis deals with the decay of the granite used for ashlar masonry in arch bridges. The aging process and the functionality decrease of the granite tend to be faster in building structures than in natural conditions. Therefore, this ongoing change need to be closely researched. At the beginning, the thesis is focused on general degradation effects on building stone, which can cause for example the reduction of material or finally its damage and destruction. Further, the character of the granite is analysed with the respect to its quality and resistance to negative influences. In this chapter, this thesis also deals with the classification of granitic rocks according to the composition and the structure, which determine the specific name of the rock. Finally, the granite stone is also used in the constructions of arched bridges as their supporting elements, namely vaults and pillars. This type of construction has been widely used in the past. One of the subchapters focuses on the case study of the Legií bridge in Prague, which is a stone arch bridge made of granite blocks. In particular, the author describes the analysis of the sample, which was processed in the petrographic laboratories at the Faculty of Science of Charles University.
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