Prohlížení ČVUT - elektronické publikace dle autora "268112fc-5546-4b63-8dc6-b5e3ec99c09c"
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MICROSCOPIC AND PHASE ANALYSIS OF CEMENT PASTE CONTAINING WASTE MICRONIZED MARBLE POWDER
Autor: Prošek, Zdeněk; Tesárek, Pavel; Trejbal, Jan
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2018)The article focuses on the impact of waste marble powder on resulting cement composites. We investigate of influence waste marble powder on the hydration process and hence the resulting phase composition. The hydration ... -
MICROSCOPICAL AND MICROMECHANICAL FEATURES OF HIGH PERFORMANCE CONCRETE CONTAINING LOW LEVELS OF FLY ASH
Autor: Hrbek, Vladimír; Prošek, Zdeněk; Chylík, Roman; Vráblík, Lukáš
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2019)Alkali activated fly ash is a widely used admixture to the concrete. Due to the pozzolanic activity, the fly ash can replace up to 60 mass percentage. The impact of fly ash on the concrete depend on the level of it content, ... -
New possibilities for recycling of mineral wool separated from thermal insulation waste
Autor: Trejbal, Jan; Zobal, Ondřej; Domonkos, Mária; Prošek, Zdeněk
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)It has become increasingly clear, that the recent consumption of mineral resources is unsustainable. The Czech Republic produces more than 217,000 tones of mineral wool annually, while its recycling stays unacceptably ... -
PERFORMANCE OF CEMENT COMPOSITES REINFORCED WITH SURFACE-MODIFIED POLYPROPYLENE MICRO- AND MACRO-FIBERS
Autor: Antoš, Jakub; Dejdar, Lukáš; Trejbal, Jan; Prošek, Zdeněk
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2017)This paper focuses on the mechanical properties investigation of cement pastes reinforced with surface treated polymer fibers. The cement matrix was composed of Portland cement (CEM I 42.5 R, w/c ratio equal to 0.4). Two ... -
PLASMA MODIFICATION OF MICROFIBERS - APPLICATION TO LIGHTWEIGHT CEMENT COMPOSITE CONTAINING RECYCLED CONCRETE
Autor: Ďureje, Jakub; Prošek, Zdeněk; Trejbal, Jan; Tesárek, Pavel; Potocký, Štěpán
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2021)The article deals with the optimalization of composition for reinforced lightweight cement composite containing micronized recycled concrete, which will be used to produce masonry blocks. The composite material is reinforced ... -
PLASMA MODIFICATION OF POLYVINYL ALCOHOL MICROFIBERS TO IMPROVE COHESION WITH CEMENT MATRIX
Autor: Ďureje, Jakub; Prošek, Zdeněk; Trejbal, Jan; Tesárek, Pavel
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2019)The article describes plasma modifications of the surface of polyvinyl alcohol (PVA) microfibers using oxygen and hydrogen plasma in order to improve the properties of the composite material containing modified microfibers, ... -
PLASMA TREATMENT IMPACT ON PHYSICAL AND CHEMICAL PROPERTIES OF POLYMERIC FIBERS
Autor: Hlůžek, Radim; Prošek, Zdeněk; Trejbal, Jan; Fládr, Josef; Potocký, Štepán
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2017)Presented work focuses on chemical and physical properties of plasma modified polymeric macro-fibers. Polyethylene terephthalate (PET) and polypropylene (PP) fibers having approx. 300 μm in diameter were modified using ... -
PULLOUT BEHAVIOR OF OXYGEN PLASMA TREATED POLYMER FIBERS FROM CEMENT MATRIX
Autor: Trejbal, Jan; Horová, Tereza; Prošek, Zdeněk
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2017)The aim of this work is to describe bonding properties between surface treated polymer fibers and a cement matrix. In order to increase an interaction between the matrix and fiber surfaces, two fiber types having approx. ... -
RECYCLING AND ITS USE IN CONCRETE WASTE PROCESSING BY HIGH-SPEED MILLING
Autor: Prošek, Zdeněk; Tesárek, Pavel; Trejbal, Jan
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2019)This article discusses the possibility of recycling of concrete waste using the high-speed milling method. The resulting of milling is micronize old concrete. Used old concrete was created by crushing of old concrete, which ... -
RECYCLING OF CONSTRUCTION WASTE USING HIGH-SPEED MILLING PROCESS: DETERMINATION OF WASTE CONCRETE
Autor: Prošek, Zdeněk; Tesárek, Pavel; Trejbal, Jan; Horová, Tereza
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2019)This paper deals with the use of high-speed milling process for recycling old concrete and direct determination of the potential of input waste. For this purpose, three different types of waste concrete were used: prefabricated ... -
SHORT-TERM CORROSION RESPONSE OF METALS IN LIME MORTAR
Autor: Bauerová, Pavla; Prošek, Zdeněk; Krejsová, Jitka; Keppert, Martin
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2019)Even though the corrosion of steel in concrete is very well described, the corrosion processes in lime environment studied very rarely. This environment is obviously also basic and its pH decreases in time, but the obtained ... -
Sulphate corrosion of cement pastes with a high content of waste marble powder
Autor: Prošek, Zdeněk; Tesárek, Pavel
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)The article focuses on sulphate corrosion of cement pastes with a high content of waste micronized marble powder. Micronized marble powder is used as a substitute for Portland cement CEM I 42.5R. The amount of micronized ... -
THE EFFECT OF MICRO-SILICA ON THE MICROSCOPIC FEATURES OF THE UHPC COMPOSITE AND ITS INTER-FACIAL TRANSITION ZONE
Autor: Hrbek, Vladimír; Prošek, Zdeněk; Chylík, Roman; Vráblík, Lukáš
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2018)The uplift of concrete overall macroscopic performance by way of alternative additives is commonly used technique. In case of ultra high performance concrete (UHPC), micro-silica is added to the mixture as a micro-filler ... -
THE EFFECT OF PLASTICIZER ON MECHANICAL PROPERTIES OF THE CEMENT PASTE WITH FINE GROUND RECYCLED CONCRETE
Autor: Hrůza, Jaromír; Prošek, Zdeněk
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2017)This article deals with the usage of recycled concrete, which arises from the demolition of concrete structures. The work is focused on the development of mechanical properties (Young's modulus, compressive and flexural ... -
THE INFLUENCE OF THE USE OF RECYCLED GYPSUM ON THE PROPERTIES OF GYPSUM PRODUCTS IN LABOR CONDITIONS
Autor: Sekavová, Hana; Herrmann, Jakub; Prošek, Zdeněk; Nyč, Miroslav; Karra’a, George
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2020)The article presents the first results from research, which is deal with recycling of plaster boards and use of the resulting material. The research is carried out within the project MPO Trio c. FV30359 “Recyklace ... -
Thermal properties of mineral wool insulation recovered from construction and demolition waste
Autor: Domonkos, Mária; Zobal, Ondřej; Prošek, Zdeněk; Trejbal, Jan
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)Mineral wool is one of the most commonly used types of thermal insulation in the European Union at the present, however, it generates massive amounts of waste. From an environmental standpoint, recycling or reuse of ... -
Treatment of polypropylene microfibers by atmospheric and low-pressure plasma – application to a reinforced cement composite containing recycled concrete
Autor: Ďureje, Jakub; Prošek, Zdeněk; Trejbal, Jan; Potocký, Štěpán; Hlůžek, Radim
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2023)The effect of atmospheric and low-pressure plasma modification on polypropylene (PP) microfibers was examined. Mechanical changes on the microfiber surfaces were observed using scanning electron microscopy (SEM). Next, ...