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Archiv článků od 19.6.2020 do 20.2.2022

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20.2.2022
Ing. Martin Nguyen, Ing. Martin Sedlačík, doc. Ing. Radomír Sokolář, Ph.D., doc. Ing. Tomáš Opravil, Ph.D.

This article deals with the manufacturing process of inorganic foam glass with utilization of waste diatomite as a raw material. The waste diatomite was first subjected to an analysis of chemical and mineralogical composition. The foam glass was formed by a powder sintering method by pressing into pellets with the addition of a foaming agent. After firing, the properties of the foam glass were investigated using an X-ray diffraction analysis, scanning electron microscopy, bulk density, and compressive strength. The possibility of utilization of waste diatomite in raw material mixtures was investigated in accordance with the influence of firing temperature and the resulting properties of inorganic foam glass.

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27.12.2021
doc. Ing. Jana Marková, CSc., ČVUT Praha, Kloknerův ústav

The new Eurocodes for basis of design and actions are almost completed and the final phases of their minor modifications are underway within the working groups of technical subcommittees SC1 and SC10. Their national availability for translations and preparation of national annexes is planned between 2023 and 2025, their implementation and withdrawal of the current Eurocodes in 2028. For the operational implementation of the new generation of Eurocodes, it will soon be necessary to prepare new national annexes and optimally set the values of nationally determined parameters, including calibrations of partial factors for loads and material properties, to ensure reliability, safety and economy of our buildings. It is expected to use the potential of our experts, as well as the considerable financial resources will be needed for the national implementation of the new Eurocodes and the publication of new manuals with practical applications.

Císařský špitál na Pražském hradě
22.12.2021
doc. Ing. Eva Burgetová, CSc., Ing. Denisa Boháčová

The article presents a structural survey of the historic building of the Imperial Hospital at Prague Castle. The aim of the survey was to determine the functional capability and durability of the building, including an assessment of its usability and evaluation of the condition of historical materials. The research was focused mainly on the issue of inappropriate interventions performed in the past and the associated increased moisture of structures.

Stěna porostlá zelení
19.12.2021
Ing. Jana Bartlová, VUT FAST v Brně, Ústav stavitelství

Greening of the cities (Green Architecture) is one of the current trends in the development of urban architecture. Apart from the system elements of facades overgrown or planted with vegetation, which are a question of the current century, the Green Architecture also includes the traditional use of plants - direct planting near building structures, with their gradual connection using climbing and attachment mechanisms of plants. The effects of such a surface on traditional and modern building surfaces have not yet been precisely defined. The paper presents the results of moisture measurement of the outer surface of traditional building structures in order to evaluate the effect of vegetation surface on the structure.

14.12.2021
doc. Ing. Jaroslav Sandanus, PhD., doc. Ing. Kristián Sógel, PhD.

This paper deals with the diagnostics of a timber load-bearing structure before planned renovation of covering structures. The roof and facade cladding can also change the load conditions, therefore, the inspection static design in this case is necessary. The planned object renovation is an opportunity for elaboration of diagnostic inspection of the supporting structure.

8.8.2021
Ing. Jan Vystrčil, Ing. arch. Tatiana Rebrova

The article describes the development of a prototype vegetation facade panel using parametric modelling. Parametric modelling was then most used for the design of individual parts of the panel, especially the visual part of the panel, which consists of a mathematically generated mesh, and also to create a supporting structure for vegetation. The production of individual prototypes of panels, their parts and components was performed with the help of FDM 3D printing. Individual prototypes were further subjected to testing in real conditions to verify the functionality of the proposed prototype and to identify the strengths and weaknesses of the panel, which will be used for further development.

13.4.2021
Ing. David Průša, prof. RNDr. Ing. Stanislav Šťastník, CSc., Ph.D., doc. Ing. Karel Šuhajda, Ph.D.

This task deals with the properties and the possibility of recycling of thermal insulation materials such as polystyrene and mineral wool, not only from buildings after demolition but also from discarded materials left over after the construction of new buildings. This newly developed material is being tested as a filler for ultra-lightweight concrete where it fills the cavities of ceramic hollow bricks, as a filler for self-compacting concrete (SCC) and for the production of acoustic facing.

12.4.2021
prof. Ing. Peter Turček, PhD., Stavená fakulta STU, Bratislava, Katedra geotechniky

The paper offers an overview of the performed analyses, which evaluated the leakage into underground garages in the densely built-up area of the Prague city centre. Only after a comprehensive reassessment of geological conditions, the project and other available information was it possible to determine the probable causes of leakage into large underground parking spaces.

28.12.2020
prof. Ing. Pavel Kuklík, CSc., ČVUT v Praze, Fakulta stavební, katedra mechaniky

This contribution deals with damage to buildings and building materials due to bad manage of rainwater regime. Effects are divided according to location of damage. First, the damage of roofs and roof trusses is presented, which are followed by examples of damage to the enclosure walls. The most attention, including numerical 3D modeling, is devoted to damage to foundation structures and foundations.

23.11.2020
Ing. Miroslav Procházka, Technický a zkušební ústav stavební Praha, s.p.

This paper deals with the test results of shear characteristics of thermal insulation boards based on MW with longitudinal orientation of fibres of thickness 200 mm and more according to ČSN EN 13162+A1, documents serious faults in test procedure according to current ČSN EN 12090, reasons included, and proposes possible way of their solution.

10.11.2020
doc. Ing. Vladimír Tichomirov, CSc., LL.M., Inženýrská, expertní a znalecká kancelář Brno

In the expert business, the usual requirement is to find a possible fault, its cause and a proposal for how to eliminate it. More and more often, however, in expert practice I encounter the requirement to simultaneously assess the current state of the flat roof and especially the waterproofing layer and comment on its possible further functionality and durability.

2.11.2020
doc. Ing. Miloš Lavický, Ph.D., Ing. Zuzana Mastná, Ph.D.

The paper is presenting problems that are to be solved within expert opinions focused on wooden houses which foundation is designed as a crawl space.

26.10.2020
Ing. Jakub Čurpek, PhD., Ing. Jozef Bočkaj, Ing. Martina Jurigová, PhD.

The present paper deals with the assessment of several realized construction details within the renewed flat roof of the multifunctional building. The new roof structure has the composition of a single-layer flat roof with a classic order of layers, which is mounted on the original roof structure. The problematic details are closely related to the incorrect realization of the waterproof membrane and its fitting to the individual building structures within the detail. Individual factors play a significant role in the assessment: absence of additional elements (cover and anchor strips), improper drainage of rainwater from the roof surface and improper handling of accessories within the waterproof membrane. The assessment of the individual details revealed significant shortcomings that can cause rainwater penetration into the roof structure and thus endanger the reliability and durability of the roof.

© Wilm Ihlenfeld - Fotolia.com
19.10.2020
Ing. Miroslav Procházka, Technický a zkušební ústav stavební Praha, s.p.

This paper deals with the content of prepared review of ČSN 73 2902:2020 External thermal insulating composite systems (ETICS) – Design and application of mechanical fastening for fixing of ETICS in the base material. It specifies modifications made in content of standard and in particular the addition of new provisions for correct assessment of the stability of the ETICS.

5.10.2020
Ing. Marek Kervitcer, doc. Ing. Karel Šuhajda, Ph.D.

The paper deals with construction modifications of the public building complex roof, which was repeatedly flooded. The roof structure consists of a combination of a sloped roof around the perimeter of the building and a flat roof above the inner space of the floor plan. In the article the authors focus on solving the atypical detail required by the roof modifications.

17.8.2020
Ing. Jaroslav Hejl, Stavební fakulta, ČVUT v Praze

In modern building systems, sound insulation of walls is often made of multi-layer structures. This article deals with the acoustic operation of such structures and discusses the importance of proper implementation. It also warns against limited sound insulation at low frequencies, which is often not given enough attention. Software for calculating sound insulation - INSUL - was used to compare the acoustic behavior of structures and for simulations.

27.7.2020
doc. Ing. Jiří Zach, Ph.D., Ing. Vítězslav Novák, Ing. Martin Sedlmajer, Ph.D., Ing. Jan Bubeník

From the point of view of sustainable development in construction, the possibility of using easily renewable raw materials for the production of advanced thermal insulation materials currently represents an interesting way to effectively reduce the energy consumption of buildings. Insulators with ever-increasing thicknesses are being utilised in buildings; the use of these raw materials allows for the insulators’ production without the need for a substantial increase in CO2 emissions and energy consumption.
Natural fibres generally display very low thermal conductivity. Despite their relatively great thickness (in the case of technical fibres) these fibres are porous, and upon reducing pressure they show significant loss of thermal conductivity. Remarkably, it is the same in the case of materials based on glass fibres, which are used industrially in the production of vacuum insulators. When using natural materials as thermal insulators there is a common problem with their high sensitivity to humidity and consequent degradation of thermal insulating properties upon increasing their water content. In the case of using natural fibres for the production of vacuum insulators, these fibres are protected against humidity by a barrier foil that creates a vacuum insulation panel (moreover, the panel also always contains an active dryer), this is why their use in this field is so interesting.

19.6.2020
Jiří Patloka, Erika Kratochvílová

The unfavourable effects of the weather on unprotected wood and timber products can cause changes to the mechanical and chemical properties of the wood, and if unchecked can do irreversible damage. The sheathing of wooden buildings must always be supplemented with surface treatments, and in a large number of cases a contact thermal insulation system is used. The paper presents research focused on the possibility of using a commonly used cement adhesive for bonding thermal insulation to the substrate formed by oriented strand boards. The substrate is provided with several types of penetration coatings or bonding primers and subsequently their influence on the adhesion of the cement adhesive is monitored. The best values were achieved when treating the surface treatment with a modified dispersion with quartz sand. On the other hand, the penetration coating of a mixture of water, nanodispersion of styrene-acrylate copolymer and additives is inappropriate treatment.


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