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Determination of characteristics and conditions of timber in structures
Drdácký, Miloš
Technological survey of historic timber and selected non/destructive or minor destructive methods are presented, e.g. technological traces from carpentry tools, X-ray diagnostics, ultrasonics, microdrilling, videoscopy, and assessement of mechanical characteristics from tests on small size non/standard specimens – drilled cores and cut strands.
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Tests for desing of mortars and renders compatible with existing historic material
Válek, Jan ; Slížková, Zuzana
Design of masonry mortars and renders for repair of historic structures includes tests and testing procedures which serve for evaluation of compatibility between existing material and repair mixtures. Paper describes current possibilities of tests and analysis of historic and new mortars. The authors stem from published definitions of compatibility and emphasize a necessity to take into account also more detailed technical specifications, e.g. position of evaluated material in structure, type of structure, material exposure conditions, degree of deterioration of material and its ability to serve its original function.
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Modelový výzkum větru pro památkovou péči
Pospíšil, Stanislav ; Drdácký, Miloš ; Slížková, Zuzana ; Lesák, Jaroslav ; Knotková, D.
The paper presents by means of case studies some possibilities of wind tunnel model research into the action of wind on monuments. The first case describes investigations of the behaviour of gothic sandstone pinnacles during cyclic action of various combinations of climatic loads. Further, the problems of wind pressure and eddies and flow around historic buildings are presented. The last example studies surface degradation of complex architectural forms due to atmospheric pollution.
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