About: Alkali-activated fly ash foams – synthesis, chemo-physical properties and microstructure modeling

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rdf:type	skos:Concept http://linked.opendata.cz/ontology/domain/vavai/Vysledek
Description	Inorganic foams offer several unique properties such as low thermal conductivity, fire resis- tance, or UV stability. Inorganic foam specimens were synthesized from fly ash and aluminium powder through an alkali-activation process. Depending on mix proportions, bulk densities ranged between 400 and 800 kg/m 3 . Thermal treatment at 80 ° C for 12 hours accelerated curing process. Compressive strength was found in the range 4.5-9.0 MPa, flexural strength 0.6-1.7 MPa, Young's modulus 0.6-1.1 GPa, thermal conductivity 0.14-0.16 W/m/K and thermal capacity around 1100 J/kg/K. Exposing the foams to temperature 800 ° C led to a small decrease of compressive strength while exposure to 1100 ° C sintered the foam to higher strength of 13 MPa. Volumetric shrinkage 20% occurred at 1100 ° C with- out further disintegration. Residual compressive strength was determined after exposure to NaCl, HCl, Na 2 SO 4 , MgSO 4 , H 2 SO 4 . The highest reduction to 20% occured in both acids with pH=2 after one year of exposition. Digitized microstructures entered finite element analysis to validate a stress-strain diagram. Inorganic foams offer several unique properties such as low thermal conductivity, fire resis- tance, or UV stability. Inorganic foam specimens were synthesized from fly ash and aluminium powder through an alkali-activation process. Depending on mix proportions, bulk densities ranged between 400 and 800 kg/m 3 . Thermal treatment at 80 ° C for 12 hours accelerated curing process. Compressive strength was found in the range 4.5-9.0 MPa, flexural strength 0.6-1.7 MPa, Young's modulus 0.6-1.1 GPa, thermal conductivity 0.14-0.16 W/m/K and thermal capacity around 1100 J/kg/K. Exposing the foams to temperature 800 ° C led to a small decrease of compressive strength while exposure to 1100 ° C sintered the foam to higher strength of 13 MPa. Volumetric shrinkage 20% occurred at 1100 ° C with- out further disintegration. Residual compressive strength was determined after exposure to NaCl, HCl, Na 2 SO 4 , MgSO 4 , H 2 SO 4 . The highest reduction to 20% occured in both acids with pH=2 after one year of exposition. Digitized microstructures entered finite element analysis to validate a stress-strain diagram. (en)
Title	Alkali-activated fly ash foams – synthesis, chemo-physical properties and microstructure modeling Alkali-activated fly ash foams – synthesis, chemo-physical properties and microstructure modeling (en)
skos:prefLabel	Alkali-activated fly ash foams – synthesis, chemo-physical properties and microstructure modeling Alkali-activated fly ash foams – synthesis, chemo-physical properties and microstructure modeling (en)
skos:notation	RIV/68407700:21110/14:00221387!RIV15-GA0-21110___
http://linked.open...avai/riv/aktivita	P
http://linked.open...avai/riv/aktivity	P(GA13-22230S), P(GAP104/12/0102)
http://linked.open...iv/cisloPeriodika	0
http://linked.open...vai/riv/dodaniDat	2015
http://linked.open...aciTvurceVysledku	Hlaváček, Petr Šmilauer, Vít
http://linked.open.../riv/druhVysledku	J - Článek v odborném periodiku
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	2187
http://linked.open...ai/riv/idVysledku	RIV/68407700:21110/14:00221387
http://linked.open...riv/jazykVysledku	eng - angličtina
http://linked.open.../riv/klicovaSlova	alkali-activation; fly ash; foam; chemical durability; mechanical properties (en)
http://linked.open.../riv/klicoveSlovo	fly ash mechanical properties alkali-activation foam chemical durability
http://linked.open...odStatuVydavatele	CH - Švýcarská konfederace
http://linked.open...ontrolniKodProRIV	[6B9C350038D9]
http://linked.open...i/riv/nazevZdroje	Advances in Science and Technology
http://linked.open...in/vavai/riv/obor	JH
http://linked.open...ichTvurcuVysledku	2 (xsd:int)
http://linked.open...cetTvurcuVysledku	3 (xsd:int)
http://linked.open...vavai/riv/projekt	Aluminosilicate polymer foams A hybrid multiscale predictive modelling tool for heterogeneous solids
http://linked.open...UplatneniVysledku	2014
http://linked.open...v/svazekPeriodika	92
http://linked.open...iv/tvurceVysledku	Hlaváček, Petr Škvára, F. Šmilauer, Vít
issn	1662-0356
number of pages	6 (xsd:int)
http://localhost/t...ganizacniJednotka	21110

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