Advanced Materials Research Vol. 923

Abstract: This paper presents the results of research focused on the modification of composition of the polymer-cement mortars. The use of these materials is quite wide. The greatest use can be found in the production of reinforced concrete repair materials. Specifically, the article analyzes problems of lightweight aggregate effect on the resistance of polymer-cement mortars to extremely high temperatures. The link is particularly evident with the risk of fire. Attention was given to the two different types of aggregates - from primary raw materials (Liapor) and alternative sources of raw materials (fly ash aggloporite). The study was carried out by the laboratory analyzing the basic material characteristics of prepared samples which were exposed to temperatures up to 1200 ° C.

Abstract: From the earliest times of human history are used portable light sources. First advanced devices were torches and candles, and then human population started using kerosene lamps and other more sophisticated portable light sources based on biology or electricity. Light source based on a chemical reaction has one common denominator and that is the release of fumes while fuel combustion. In these cases, it is the source of its own, which is referred to such bodies or substances in which structure is formed light. Nowadays, historically valuable buildings more often server different purpose than they were originally built. This change in use can lead to a significant influence on historical building and its life span. One of the many factors negatively affecting the life of monuments are fumes from candle combustion. Massive use of candles releases toxic substances into the environment, which in high concentrations can affect human health and can also damage due to chemical reactions historically valuable monuments

Abstract: Nowadays the use of authentically, natural building materials for the preservation of monuments ends, where moisture and steam arises: in climatically challenging rooms like baths, kitchens, saunas, SPAs By reference to two of the oldest steam bathes of Morocco we can try a more scientific view on the problem by focussing this kind of ancient architecture, which presents us the capability to protect earth building units by compressed, hydrophobized lime plasters. Reported are the preliminary results achieved with non-destructive prospection of the old steam bathes by use of a 3D laser scanner with integrated colour camera.

Abstract: Microorganisms on the facades of buildings (eg, algae and cyanobacteria) are the harmful factors that cause destruction of the surface of building materials in exterior (facade paints, plasters, masonry, stone, concrete, etc.). One of the properties of listed biological factors is the production of thermal energy, which can vary in different species. Mentioned energy can be recorded using infrared thermography. The paper contains the results of the examined expressions of the biological pests on the insulated facades of the buildings using infrared thermography.

Abstract: The reflected radiation significantly negatively influences the results of the quantitative infrared thermographic measurement in the exterior. The paper deals the method of elimination of reflected radiation using appropriate equipment including examples of practical results of measurements.

Abstract: Verification of reach of grouting masonry using infrared thermography. Chemical grouting masonry is a progressive, modern restoration technique. Verification of reach (efficiency) of injection media by nondestructive methods have not been established and verified, yet. The article deals with the presentation of the results of the pilot thermography measurements.

Abstract: The contribution deals with possibilities of using waste from the production of stone wool for modification of the existing composition of cement boards . Waste - the fibres from the production of stone wool - was used as an alternative to the standardly used wooden filler (chips, sawdust). The waste was tested in laboratory and then added to the mixture for the production of cement-bonded particleboards as a substitute for wood filler. The physical and mechanical properties of laboratory-made boards with a modified recipe were monitored.

Abstract: Connection of new steel rods to original iron tongs in historic buildings is largely carried out by screwing. This solution requires drilling holes into the original iron element. Another solution - special welding - is also irreversible intervention into the original historic material. Clamp joints as a non-invasive solution were used to connect new steel rods to iron tongs originated from the late 17th Century in Teplá Monastery, Czech Republic.

Abstract: The degradation of laminated glass as a result of increased temperature has become one of the important problem of reconstructions and designs of new glass structures, for instance high-rise buildings that are exposed to the impacts of an intensive heating caused e. g. by sunshine. The temperatures during heating can reach very high values, commonly from 60 to 70 °C. The effect of heating was simulated using the thermal chamber where the glass panes with the size of 120 x 1100 mm were heated. The deformation course under the increase of temperature was continually monitored by a measuring unit. In total six types of foils joining particular layers of glass were examined. In this paper the experimentally gained results are compared with a numeric computer analysis and the particular kinds of interlayers are evaluated using the loss of shear interaction.

Abstract: Historic structures are made of different types of masonry with significantly different properties. As a rule the information on mechanical properties of masonry components has to be obtained by testing. Estimation of masonry strength from measurements with due regard to relevant uncertainties may be a key issue of the reliability assessment. The probabilistic model of masonry strength is developed considering uncertainties in basic variables and testing procedures. It appears that the characteristics of masonry strength can be well estimated using fundamental statistical methods.