Browsing by Author "Kusák, Ivo"
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Carbon admixtures influence on the electrical properties of slag mortars focusing on alternating conductivity and permittivity
Luňák, Miroslav; Kusák, Ivo; Chobola, Zdeněk (Elsevier, 2016-08-01)New materials based on alkali-activated slag mortars may be an important contribution of applied research, which strives to offer the use of waste materials as a full replacement for the currently used binders and explores ... -
Comparison of results of impedance spectroscopy methods with results of impact-echo method in investigation of high-temperaturedegraded concrete
Luňák, Miroslav; Kusák, Ivo; Štefková, Daniela (Elsevier, 2016-08-01)The growth in the transport industry results in more accidents, which often include fire in locations with the concrete structures, which also effects its lifetime and its functionality. After any case of fire loading it ... -
Electric conductivity changes in geopolymer samples with added carbon nanotubes
Kusák, Ivo; Luňák, Miroslav; Rovnaník, Pavel (Elsevier, 2016-08-01)By incorporation of nanotubes to the current composite materials, their properties can be significantly improved. Carbon nanotubes can act as filler, which minimizes the air gaps content in the matrix. The denser structure ... -
Electrical and Self-Sensing Properties of Alkali-Activated Slag Composite with Graphite Filler
Rovnaník, Pavel; Kusák, Ivo; Bayer, Patrik; Schmid, Pavel; Fiala, Lukáš (MDPI, 2019-05-16)The electrical properties of concrete are gaining their importance for the application in building construction. In this study, graphite powder was added to alkali-activated slag mortar as an electrically conductive filler ... -
Electrical properties of alkali-activated slag composite with combined graphite/CNT filler
Rovnaník, Pavel; Míková, Maria; Kusák, Ivo (IOP Publishing Ltd., 2017-10-25)Alkali-activated industrial by-products such as blast furnace slag are known to possess properties which are comparable to or even better than those observed for ordinary Portland cement. The combination of alkali-activated ... -
Impact of graphite admixture on electrical properties of alkali-activated slag mortars
Kusák, Ivo; Luňák, Miroslav; Rovnaník, Pavel (EDP Sciences, 2017-05-24)One of the objectives of the applied research's striving consists in providing the users with new slag-mortar-based materials. Basic research, in its turn, aims at examining the newly created materials from the viewpoint ... -
Low-frequency noise measurements used for quality assessment of GaSb based laser diodes prepared by molecular beam epitaxy
Chobola, Zdeněk; Luňák, Miroslav; Vaněk, Jiří; Hulicius, Eduard; Kusák, Ivo (Faculty of Electrical Engineering and Information Technology of the Slovak University of Technology, 2015-08-01)The paper reports on a non-destructive method of reliability prediction for semiconductor lasers diodes GaSb based VCSE. Transport and noise characteristic of forward biased were measured in order to evaluate the new MBE ... -
Monitoring of concrete hydration by electrical measurement methods
Kusák, Ivo; Luňák, Miroslav; Chobola, Zdeněk (Elsevier, 2016-08-01)Analysis of impedance spectra of inhomogeneous materials is a part of the impedance spectroscopy which is still waiting for its development. Materials having higher electric resistance values (over 500 kohm) can be considered ... -
Nonlinear Elastic Wave Spectroscopy with MLS Perturbation Signal
Carbol, Ladislav; Martinek, Jan; Kusák, Ivo; Kucharczyková, Barbara (Výzkumný ústav stavebních hmot,a.s., 2016-05-31)The article describes a test procedure based on the fundamental principle of Nonlinear Elastic Wave Spectroscopy. Without integration of all test stages into one automated measurement station and without Maximum Length ... -
On the effect of addition of carbon nanotubes on the electric conductivity of alkali-activated slag mortars
Kusák, Ivo; Luňák, Miroslav (IOP Publishing, 2017-10-18)This paper presents basic electric properties of laboratory prepared alkali-activated composite materials on the basis of finely ground granular high furnace slag to which various quantities of carbon nanotubes (CNT) have ... -
Senzorické vlastnosti alkalicky aktivovaných struskových kompozitů při namáhání v tlaku
Míková, MariaVýroba stavebních materiálů vyžaduje velké množství energie. Její spotřeba může být snížena užitím druhotných surovin. Tato diplomová práce se zabývá senzorickými vlastnostmi stavebních materiálů. Jsou prezentovány elektrické ... -
Vliv ohybového namáhání na elektrické vlastnosti alkalicky aktivovaných struskových kompozitů
Šimko, LukášKlasický beton je nejpoužívanějším stavebním materiálem. Dnešní doba si ovšem žádá stále vyšší nároky na nízkou energetickou náročnost, na trvanlivost konstrukcí spojenou s jednoduchou diagnostikou stavu konstrukce a velmi ...