National Repository of Grey Literature 20 records found  previous11 - 20  jump to record: Search took 0.00 seconds. 
Designing of all-wooden carpentry joints for reconstruction of historical structures
Kunecký, Jiří ; Hasníková, Hana ; Fajman, P. ; Tippner, J.
The article introduces the new method „Lapped Scarf Joints for Repairs of Historical Structures“ that deals with the design of the lapped scarf joint suitable for the reconstruction of valuable historical timber structures, with help of making the prosthesis for the damaged parts of the beams. The method is the result of the four-year research project supported by the Czech Ministry of Culture within NAKI program. Institute of Theoretical and Applied Mechanics AS CR, Faculty of Civil Engineering CTU and Faculty of Forestry and Wood Technology of Mendel University participated on the research.
The efficacy assessment of water repellent agent POLYMEMBRAN applied on natural stone and hardened lime mortar
Hasníková, Hana ; Mordanova, Anna ; Drdácký, Miloš ; Slížková, Zuzana
The subject of the study was assess the influence of water repellent agent on the properties of four different natural stones that are frequently used building material in the Czech Republic. Besides color change were primarily assessed changes in the microstructure, which significantly influences the transport of water and water vapour through treated material.
The determination of material characteristics of natural and artificial stone samples from Marian Column at Hradčany Square in Prague
Slížková, Zuzana ; Zeman, Antonín ; Petráňová, Veronika ; Viani, Alberto ; Pérez-Estébanez, Marta ; Frankeová, Dita ; Ševčík, Radek ; Mácová, Petra ; Janotová, Dana ; Hasníková, Hana ; Niedoba, Krzysztof ; Hauková, Petra
Within the survey before restoration intervention material properties of natural and artificial stones that are part of the Marian Column at Hradcany Square in Prague were determined. 15 samples were subjected to extensive instrumental analysis, whose output is not only chemical and mineralogical composition of the samples, but also the degree of degradation including a description of the porous system and the level of salinity.
New devices for diagnostics of historical structures
Hasníková, Hana ; Kloiber, Michal ; Zíma, Pavel
Two new devices developed at ITAM AS CR for non-destructive testing of materials, especially from historical structures, are presented below. So called microtube is a semi-automatic portable tool for water absorption measurements. The natural stones, mortars and other porous materials can be measured and it is very useful to assess the efficiency of various hydrophobic treatments used within the restoration also. The diagnostic device for in-situ assessment of timber enables direct determination of conventional compressive strength and modulus of deformation in arbitrary depth along timber profile. The semi-destructive method causes a very gentle damage on the structural members.
New devices for diagnostics of historical structures
Hasníková, Hana ; Kloiber, Michal ; Zíma, Pavel
The aim of the paper is to present a few new devices that were developed at ITAM AS CR for non-destructive testing of materials, especially those from historically valuable structures. So called microtube is a semi-automatic portable tool for water absorption measurements. It consists of box with microprocessor where the time is recorded and the plastic “pistol” – a part that is in contact with the material surface and where the scaled micro-tube is fixed on. The natural stones, mortars and other porous materials can be measured by the microtube; it is very useful to assess the efficiency of various hydrophobic treatments used within the restoration. The diagnostic device for in-situ assessment of timber in existing structures enables direct determination of conventional compressive strength and modulus of deformability in arbitrary depth along timber profile. The semi-destructive method causes a very gentle damage on the structural members.
Assessment of the efficiency of various consolidation agents based on the evaluation of changes of material properties of Kutna Hora limestone from Church of St. James in Kutna Hora
Slížková, Zuzana ; Hasníková, Hana
The report describes the procedure of assessment of efficiency of two consolidation agents used on limestone from Church of St. James in Kutná Hora. It includes photographic documentation and all the results with final evaluation and conclusion. Two non-destructive methods were used in-situ on the church – water absorption measurement by microtube and so called peeling test. The locations of the tests are mentioned in the report.
Assessment of the efficiency of various consolidation agents based on the evaluation of changes of material properties of plaster from the Imperial Palace in the Karlštejn Castle
Slížková, Zuzana ; Drdácký, Miloš ; Hasníková, Hana ; Frankeová, Dita
The report describes the procedure of assessment of efficiency of four consolidation agents used on plaster from the Imperial Palace in the Karlštejn Castle. It includes photographic documentation and all the results with final evaluation and conclusion. Three non-destructive methods were used in-situ in the Karlštejn Castle – water absorption measurement by Karsten tube, water absorption measurement by microtube and so called peeling test. The locations and way of taking samples are mentioned in the report also. Mechanical tests, (compression test, three point bending test) have been performed on the samples and also bulk density, open porosity and water absorption of treated and untreated material according to ČSN EN 1015-10 have been investigated in laboratories of ITAM AS CR.
Material characteristics assessment of the stone sample from the decorative vase. Technical report
Slížková, Zuzana ; Zeman, Antonín ; Petráňová, Veronika ; Niedoba, Krzysztof ; Janotová, Dana ; Hasníková, Hana ; Frankeová, Dita
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.
Comparative testing of natural stones used as a building material
Hasníková, Hana ; Zíma, Pavel
Further presentation of some destructive and non-destructive methods for investigation of mechanical and humidity properties of natural stone quarried and used as a building material in Bohemia in the medieval ages is the aim of the paper.
Testing of mechanical properties of natural stones used as a building material
Hasníková, Hana
Further presentation of some destructive and non-destructive methods for investigation of mechanical properties of natural stone quarried and used as a building material in Bohemia in the past is the aim of the paper.

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