Microscopic analyses of sgraffito sampled from house façade in Brno, Venhudova street, CR

Report presents results of microscopic characterization of sgraffito from the the fifties of the twentieth century sampled from house façade in Brno, Venhudova street, CR. Light (optical) microscopy and electron microscopy SEM-EDS were used for characterization of the aggregate and the binder of two layers of sgraffito

Survey of salinity of masonry under III. courtyard at Prague Castle

Archaeological architectural monuments in the area under III. in the courtyard of Prague Castle were monitored in 2021 in terms of the extent of salt efflorescences and their chemical composition. Salt efflorescence on the marlstone walls of the church of St. Bartholomew contain sodium carbonate and bicarbonate, sodium sulfate and calcium sulfate. Sodium nitrate and potassium nitrate were also present in some samples. The aim of the research is to propose measures to mitigate the effect of salts on the degradation of historic masonry

Design of a new mortar based on lime modified with pozzolanic materials for the repair of an historical exterior plaster floor at Karlštejn castle

The result of the report is an assessment of key characteristics (mechanical properties, absorbtion, porosity, resistance to frost) of samples taken from a mortar applied on exterior plaster floor at Karlštejn Castle as a trial test performed in 2006. The results of performed tests and a recommendation for a next conservation strategy is presented

Report of characteristics of the brick sample from the façade of the apartment building

The report brings characteristics of the brick sampled from the brick façade of the apartment building in Prague 4. Porosity, saturated water content, water absorption behaviour, water soluble salts content were determined to characterize the brick and then the effectivity of the surface protective treatment applied on the brick façade was assessed

Characterization of historical plasters sampled from town house in Cheb, CR

Report presents results of material characterization of historic plasters from townhouse in Cheb, CR. Thermal and SEM-EDS analyses were used to characterize the aggregate, the binder and painting layers on two samples of plasters

Chemical and mineralogical analyses of stone sampled from Troja Castle, baroque staircase, Prague 7

Chemical and mineralogical analyses of stone sampled from Troja Castle, baroque staircase, Prague 7

Sources of salts, their transport and action in masonry

Článek shrnuje základní informace o zdrojích solí a jejich chování ve zdivu s cílem posunout znalosti účastníků semináře o chování solí ve zdivu i o možnostech snižování vyvolaných škod

Chemical and microstructural analysis of plaster sampled from the castle Sychrov (CR) – Breton tower

The analysed mortar contains 76.5% by weight quartz sand and 23.5% wt. the lime binder - it is highly hydraulic lime. The aggregate of the mortar is made up mostly of quartz. The hydraulicity of the contained lime binder is evidenced by the presence of belitic clinkers, a strongly inhomogeneous microstructure (typical alternation of dense, Ca-enriched parts and more porous decalcified areas) and the presence of silicate components in varying degrees of reaction. It is suggested that the hydraulic binder used could have been artificially prepared by mixing lime with a hydraulic silicate additive

Material characteristics assessment of the stone sample from the decorative vase. Technical report

Two polished petrographic thin section sized 4x11mm and 5x10 mm were examined under polarizing microscope Zeiss NU 2. Pictures were taken by Olympus T 5060 camera