About: The Effect of High Temperatures on Toughness and Porosity of Concrete

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An Entity of Type : http://linked.opendata.cz/ontology/domain/vavai/Vysledek, within Data Space : linked.opendata.cz associated with source document(s)

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rdf:type	skos:Concept http://linked.opendata.cz/ontology/domain/vavai/Vysledek
Description	Mikrostruktura a tím pádem I mechanické vlastnosti betonu jsou významně ovlivňovány působením vysokých teplot. V této práci byly působení vysokých teplot do 900 °C vystaveny vzorky portlanského betonu. Byly stanoveny zbytkové mechanické vlastnosti betonu a jeho mikrostruktura. Bylo zjištěno, že nejvýznamnější změny v materiálu probíhají v intervalu teplot 180 - 440 °C (cs) Mechanical properties as well as microstructure of concrete is significantly influenced by heating. In this paper, unsealed samples of ordinary Portland cement concrete were subjected to elevated temperatures up to 900°C. Major mechanical properties were determined. Complete load-displacement curves were measured and fracture toughness of concrete was evaluated by means of several parameters including specific fracture energy, true specific fracture energy, effective critical stress intensity factor, energy release rate, softening index and coefficient. Analysis of porous structure of fragments of hardened cement paste from the same concrete samples was carried out by means of nitrogen sorption measurements. Specific volume and surface of nanopores are a good indicator of structural changes of concrete. In our experiments major texture changes in this range of pores take place in temperature range 180 - 440°C Mechanical properties as well as microstructure of concrete is significantly influenced by heating. In this paper, unsealed samples of ordinary Portland cement concrete were subjected to elevated temperatures up to 900°C. Major mechanical properties were determined. Complete load-displacement curves were measured and fracture toughness of concrete was evaluated by means of several parameters including specific fracture energy, true specific fracture energy, effective critical stress intensity factor, energy release rate, softening index and coefficient. Analysis of porous structure of fragments of hardened cement paste from the same concrete samples was carried out by means of nitrogen sorption measurements. Specific volume and surface of nanopores are a good indicator of structural changes of concrete. In our experiments major texture changes in this range of pores take place in temperature range 180 - 440°C (en)
Title	The Effect of High Temperatures on Toughness and Porosity of Concrete The Effect of High Temperatures on Toughness and Porosity of Concrete (en) Účinky vysokých teplot na houževnatost a porozitu betonu (cs)
skos:prefLabel	The Effect of High Temperatures on Toughness and Porosity of Concrete The Effect of High Temperatures on Toughness and Porosity of Concrete (en) Účinky vysokých teplot na houževnatost a porozitu betonu (cs)
skos:notation	RIV/68407700:21110/08:01147504!RIV09-MSM-21110___
http://linked.open...avai/riv/aktivita	Z
http://linked.open...avai/riv/aktivity	Z(MSM6840770020)
http://linked.open...vai/riv/dodaniDat	2009
http://linked.open...aciTvurceVysledku	Vydra, Vítězslav Vodák, František Trtík, Karel
http://linked.open.../riv/druhVysledku	D - Článek ve sborníku
http://linked.open...iv/duvernostUdaju	S - Úplné a pravdivé údaje nepodléhající ochraně podle zvláštních právních předpisů
http://linked.open...titaPredkladatele	České vysoké učení technické v Praze / Fakulta stavební
http://linked.open...dnocenehoVysledku	365111
http://linked.open...ai/riv/idVysledku	RIV/68407700:21110/08:01147504
http://linked.open...riv/jazykVysledku	eng - angličtina
http://linked.open.../riv/klicovaSlova	fracture toughness; porosity; temperature load (en)
http://linked.open.../riv/klicoveSlovo	porosity temperature load fracture toughness
http://linked.open...ontrolniKodProRIV	[8C50FFC34F57]
http://linked.open...v/mistoKonaniAkce	Dundee
http://linked.open...i/riv/mistoVydani	Bracknell
http://linked.open...i/riv/nazevZdroje	Concrete for Fire Engineering
http://linked.open...in/vavai/riv/obor	JI
http://linked.open...ichTvurcuVysledku	3 (xsd:int)
http://linked.open...cetTvurcuVysledku	3 (xsd:int)
http://linked.open...UplatneniVysledku	2008
http://linked.open...iv/tvurceVysledku	Trtík, Karel Vodák, František Vydra, Vítězslav
http://linked.open...vavai/riv/typAkce	WRD - Světová
http://linked.open.../riv/zahajeniAkce	2008-07-10 (xsd:date)
http://linked.open...n/vavai/riv/zamer	BEZPEČNOST JADERNÝCH ZAŘÍZENÍ
number of pages	12 (xsd:int)
http://purl.org/ne...btex#hasPublisher	IHS BRE Press
https://schema.org/isbn	978-1-84806-041-8
http://localhost/t...ganizacniJednotka	21110

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