Viktor Hlavička

Viktor Hlavička
Budapest University of Technology and Economics · Department of Construction Materials and Technologies

PhD

About

26
Publications
4,689
Reads
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247
Citations
Additional affiliations
March 2020 - July 2024
Budapest University of Technology and Economics
Position
  • Professor (Assistant)

Publications

Publications (26)
Article
Full-text available
Computed tomography (CT) is an excellent tool to solve certain engineering problems connected to material science (such as sulfate swelling, internal degradation due to freezing, and alkali silicate swelling) and to understand specific processes (frost peeling, acid action). Albeit borne and mostly used in the medical domain, CT is increasingly use...
Conference Paper
Full-text available
In the present study, we investigated recycled concrete's residual compressive and flexural tensile strength after high temperatures. In the experiment, concrete mixtures were prepared using three different water/cement ratios and then crushed into concrete aggregate. Then, we used the concrete aggregate to make recycled concrete mixes. Our researc...
Article
Full-text available
The objective of our research was to develop an optimum concrete mix for fire resistance, that is usable for hollow core slab prefabrication. Small-scale and full-scale tests were done, and the results were used to calibrate a numerical model that can be used to determine the temperature and load capacity reduction of steel reinforcement. With the...
Article
To date, only 1 746 bridges have been reported to collapse due to various effects. Of these accidents, 1 001 are due to hydraulic causes (friction, leaching), 520 collisions or overloads, 52 fires and only 19 times an earthquake caused the damage. Currently, there is no standard specifically developed for the fire behaviour of bridges. Therefore th...
Article
Full-text available
Geo-polymer concrete (GPC) can be obtained by chemical reactions in industrial products and naturally available alumino silicate sources. The main drawback of GPC is that there are no standard or specific guidelines for mix production. Even though the lack of a proper mix design method limits the geo-polymer acceptance in the industry. In the case...
Article
Full-text available
Fire protection of steel structures is playing an increasingly important role nowadays. The fire protection of steel structures can be solved with intumescent paint, mortar, fire protection coating and concrete coating. Several fire tests have been performed to check these solutions. Combined structures, which consist of insulation material and fir...
Article
Full-text available
Our paper analysed the residual fracture mechanical properties (fracture energy, KIC critical stress intensity factor) of normal and lightweight concrete subjected to elevated temperature. Sand and quartz aggregate were used for normal concretes (NC), and two types of expanded clay aggregates (ECA) with different densities were used for lightweight...
Article
A 2001. szeptember 11-i terrortámadás óta a kiemelt építményeket megnövekedett biztonsági elvárások mellett szükséges tervezni. Ez az előírás az újonnan épített nukleáris létesítményekre, köztük a Paks II. atomerőmű-beruházásra is vonatkozik. Ezen megnövekedett biztonsági igények meghatározzák, hogy a tervezett atomerőmű konténmentjének ellen kell...
Article
Full-text available
In this study the behaviour of double sheared doweled connections was analysed, regarding the temporal changes in fire performance. Based on literature of special features of fire performance of timber and timber connections, a timber-steel-timber connection was used with dowels and bolts in the analysis. A natural fire model was created with the O...
Article
A 2001. szeptember 11-i terrortámadás óta a kiemelt építményeket megnövekedett biztonsági elvárások mellett szükséges tervezni. Ez az előírás az újonnan épített nukleáris létesítményekre, köztük a Paks II. atomerőmű-beruházásra is vonatkozik. Ezen megnövekedett biztonsági igények meghatározzák, hogy a tervezett atomerőmű konténmentjének ellen kell...
Article
Full-text available
The primary application of the notched three point bending test (3PBT) is to determine the fracture energy of concrete. However, the measurement setup is also suitable for determining additional mechanical parameters: flexural tensile strength, modulus of elasticity, and indirectly the compressive strength also. The aim of this paper is to present...
Article
Full-text available
Purpose During the building designing, it is very important to deal with the fire resistance of the structures. The designed materials for escape routes should be selected to ensure the usability of the structures until the time of escape. Planning affects the glass structures similarly, so these can also be partition walls and load bearing structu...
Article
In our research, stones were tested after exposing them to temperature load to get information about the changes in their properties and about the limits of applicability. The tested stones are types that are widely used as tiles in Hungary (granite, marble, travertine, labradorite). Beside flexural strength, among our laboratory tests uniaxial com...
Article
Bond between concrete and reinforcement is investigated in this project after a thermal cycle at high temperature to measure bond residual properties. Six mixes were prepared with either quartzitic gravel or expanded-clay aggregates, and two types of fibers were adopted as well. Cubes were cast to measure the residual compressive strength of the va...
Article
Full-text available
Az utóbbi évtizedekben számos épületkatasztrófa igazolta, hogy a tűzteherre való méretezés kérdései továbbra is aktuálisak. A különböző hőmérsékleti tartományokban a betonban lejátszódó legfontosabb fizikai és kémiai folyamatok jelentősen befolyásolják a beton magas hőmérséklet hatására kialakuló anyagtulajdonságait. A beton tűzterhelés hatására be...
Article
Full-text available
Our study was directed to improve the residual flexural strength and the heat-resistant properties of concrete exposed to high temperatures using different fiber cocktail loadings including steel, polymer or cellulose fibers. At first the morphology and the thermal properties of the fibers and the fiber/cement composites were investigated by SEM an...
Conference Paper
The detailed knowledge of sedimentary features from microscopic to regional scales is regarded as crucial in reservoir characterization and prediction of deep geothermal systems. Generally, in the early stages of reservoir exploration, characterization of the reservoir is accomplished by evaluation of drilling data and seismic surveys. However, for...

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