1571. Corrosion monitoring of steel structure coating degradationBojan Zajec, Mirjam Bajt Leban, Tadeja Kosec, Viljem Kuhar, Andraž Legat, Stanislav Lenart, Karmen Fifer Bizjak, Gavin Kenneth, 2018, original scientific article Abstract: An important aspect regarding the sustainability of steel structures is to ensure the structure is protected from corrosion. A number of surface coatings are availablethat play an important role in protecting these structures. An important part of the management of these structures is reliable and regular inspection along with methods forearly detection of corrosion processes. In this paper, a development and application of sensors for monitoring the steel coating degradation and corrosion damage to steelsubstrate are presented. An encapsulated corrosion kit with integrated EIS sensors and ER probes was developed. To test its efficiency, steel probes were coated withselected coatings in the laboratory and their performance was assessed under various aggressive atmospheres, including; salt, industrial and humid atmosphere.
Keywords: coatings, corrosion, electrochemical impedance spectroscopy, electrical resistance probes, railways, steel structures
Published in DiRROS: 13.12.2023; Views: 281; Downloads: 142
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1572. Potresni odziv večetažnih strižnih zidanih sten in učinek utrjevanja s kompozitnimi oblogamiPetra Triller, Miha Tomaževič, Matija Gams, 2018, original scientific article Abstract: večetažnih sten, sezidanih iz modularnih zidakov, s poudarkom na opazovanju mehanizmov odziva in porušitve, ki se razvijejo v večetažnih stenah z odprtinami. Druga tema je osredotočena na raziskave utrjevanja takšnega zidovja z malto, armirano z mrežicami iz steklenih vlaken. Za raziskave smo na Zavodu za gradbeništvo Slovenije zgradili in preiskali posamezne zidove in večji trietažni preizkušanec v naravni velikosti. V cikličnem strigu pri konstantnem tlaku smo preizkusili več referenčnih in utrjenih zidov ter trietažni model dimenzij 4 x 4 m v tlorisu in višine 6,7 m. Trietažni model smo najprej obremenili do večjih, a popravljivih poškodb. Zatem smo poškodovani preizkušanec utrdili s kompozitnimi oblogami iz malte, armirane s steklenimi vlakni (GFRP), ter ga ponovno preiskali, tokrat skoraj do porušitve. V obeh primerih je bil odziv modela na vodoravno obtežbo s t. i. etažnim mehanizmom, pri katerem se večina poškodb skoncentrira v zidovih najšibkejše etaže. V zidovih smo opazili tipične strižne poškodbe z diagonalnimi razpokami. Potresno obnašanje posameznih zidov je bilo zelo podobno odzivu zidnih slopov večetažnega preizkušanca. Rezultati kažejo, da je mogoče z ustreznim načinom utrjevanja zidov doseči občutno izboljšanje potresnega obnašanja.
Keywords: nearmirano zidovje, laboratorijske preiskave, ciklične strižne preiskave, GFRP-kompoziti, utrjevanje
Published in DiRROS: 13.12.2023; Views: 300; Downloads: 111
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1573. Polypropylene blends with m-EPR copolymers : mechanical and rheological propertiesIztok Švab, Anđela Pustak, Matjaž Denac, Andrijana Sever Škapin, Mirela Leskovac, Vojko Musil, Ivan Šmit, 2018, original scientific article Abstract: The effects of two metallocene ethylene-propylene-based elastomers (m-EPR1 and m-EPR2) differing in molecular mass and viscosity on mechanical, rheological and interfacial properties were compared. The m-EPR elastomers were added to iPP in 2.5, 5, 10, 15, and 20 vol.%. Torque values, elongation at break and impact strength measured of the iPP/m-EPR1 blends were higher than the iPP/m-EPR2 blends due to higher molten viscosity of m-EPR1 than m-EPR2 copolymer. Slight differences in Young moduli as well as in tensile strength at yield and at break might indicate that tensile properties of iPP/m-EPR blends were not significantly affected by difference in viscosity or molecular mass, miscibility and spherulite size. Optimization diagrams indicated the metallocene m-EPR copolymers are efficient impact modifiers for polypropylene and showed good balancing of mechanical properties in iPP/m-EPR blends.
Keywords: isotactic polypropylene, metallocene ethylene-propylene-based elastomers, blend, mechanical properties, adhesion parameters
Published in DiRROS: 13.12.2023; Views: 342; Downloads: 163
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1579. "Kruha in dela" : o reševanju socialnih vprašanj v Istri in Trstu 19. stoletjaUrška Bratož, 2022, review article Abstract: Članek skuša predstaviti nekatere značilnosti habsburškega socialnega ‘sistema’ na območju Istre v 19. stoletju, kakor jih je mogoče zaznati predvsem skozi perspektivo delovne (ne)zmožnosti kot ključnega kriterija za ugotavljanje upravičenosti do socialne pomoči. Avtorica opazuje naslavljanje socialnih vprašanj v tem času, pri čemer se kot eden temeljnih spodbujevalcev socialnih podpor – zlasti v primerih starosti, bolezni in brezposelnosti – izkazujejo predvsem krizne okoliščine. Pozornost je posvečena tudi vprašanju financiranja dobrodelnosti, ki je v večji meri slonelo na posameznih občinah, obenem pa tudi pomembnemu segmentu ubožnih fondov – zasebni dobrodelnosti, ki jo je mogoče razumeti v kontekstu meščanske etike.
Published in DiRROS: 12.12.2023; Views: 326; Downloads: 118
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1580. Tehnične smernice za ohranjanje in rabo genskih virov : hrasti = Quercus spp.Hojka Kraigher, Mojca Bogovič, Marjana Westergren, 2010, professional article Keywords: genski viri, drevesne vrste, tehnične smernice, hrast, Quercus spp., Slovenija
Published in DiRROS: 12.12.2023; Views: 425; Downloads: 82
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