Browsing Ústav fyziky by Author "Rovnaník, Pavel"
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Effect of carbon nanotubes on the mechanical fracture properties of fly ash geopolymer
Rovnaník, Pavel; Šimonová, Hana; Topolář, Libor; Schmid, Pavel; Keršner, Zbyněk (Elsevier, 2016-06-01)Fly ash geopolymer is amorphous aluminosilicate material which is considered as alternative to Portland cement concrete. One of the limiting factors of its utilization is an increased shrinkage and related deterioration ... -
Effect of steel fibres dosage in alkali-activated slag mortars on acoustic emission obtained during three-point bending tests
Topolář, Libor; Šimonová, Hana; Schmid, Pavel; Rovnaník, Pavel (EDP Sciences – Web of Conferences, 2017-05-24)The acoustic emission phenomenon is directly associated with nucleation of cracks in structural materials during loading. This paper analyses acoustic emission signals captured during three-point bending fracture tests of ... -
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 ... -
Experimental evaluation of the effect of carbon fibres on acoustic emission parameters obtained during compressive strength tests of alkaliactivated slag composites
Topolář, Libor; Rovnaník, Pavel; Schmid, Pavel (IOP Publishing, 2018-07-12)The generation of acoustic emission signals is directly associated with formation of cracks in materials during loading. This paper deals with possibilities of acoustic emission method application as the tool for the ... -
Fracture response of alkali-activated slag mortars reinforced by carbon fibres
Šimonová, Hana; Topolář, Libor; Schmid, Pavel; Keršner, Zbyněk; Rovnaník, Pavel (IOP Publishing, 2018-07-12)The paper reports a study of the effect of carbon fibres on the mechanical fracture parameters of alkali-activated slag mortars. The carbon fibres were added in the amount of 1, 2 and 3%, respectively with respect to the ... -
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 ... -
Impedance spectroscopy measurement of metakaolin-based alkali-activated building materials
Kusák, Ivo; Luňák, Miroslav; Mizerová, Cecílie; Rovnaník, Pavel (IOP Publishing, 2020-12-18)Cement-containing as well as cement-free building materials are regarded as dielectrics. Therefore, electrically conducting admixtures are to be added to them in order to increase their electrical conductivity. Steel or ... -
Self-sensing performance of metakaolin geopolymer with carbon nanotubes subjected to repeated compressive loading
Mizerová, Cecílie; Rovnaník, Pavel; Kusák, Ivo; Schmid, Pavel (IOP Publishing, 2021-12-21)Alkaline activated binders showing enhanced piezoresistive properties have recently attracted increased interest in research of their application in smart self-sensing components. This study is focused on metakaolin ... -
Self-Sensing Properties of Fly Ash Geopolymer Doped with Carbon Black under Compression
Mizerová, Cecílie; Kusák, Ivo; Topolář, Libor; Schmid, Pavel; Rovnaník, Pavel (MDPI, 2021-08-04)The development of smart materials is a basic prerequisite for the development of new tech-nologies enabling the continuous non-destructive diagnostic analysis of building structures. Within this framework, the piezoresistive ...