Naršyti pagal autorių "Aleknevičius, Marius"
Dabar rodomi įrašai 1-20 iš 20
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Calorimetric investigations of high aluminate cement hydration in the presence of waste oil-cracking catalyst
Aleknevičius, Marius; Antonovič, Valentin (Cheminė technologija, 2009)Aluminosilicate-based zeolitic waste catalyst (fluidized catalytic cracking catalyst, FCCC) is produced by petrochemical industry in the fluidized bed catalytic cracking process. The present work shows that FCCC zeolitic ... -
Early hydration of calcium aluminate cement blended with spent FCC catalyst at two temperatures
Pacewska, Barbara; Nowacka, Mariola; Aleknevičius, Marius; Antonovič, Valentin (Procedia Engineering. 11th international conference on modern building materials, structures and techniques (MBMST), May 16-17, 2013, Vilnius, Lithuania, 2013)The early hydration (up to 24h) of calcium aluminate cement (Al2O3 min. 40%) blended with spent FCC catalyst at two temperatures i.e. 10 ̊C and 25 ̊C was investigated. The calorimetric measurements were used to study cement ... -
Early hydration of calcium aluminate cement blended with spent FCC catalyst at two temperatures
Pacewska, Barbara; Nowacka, Mariola; Aleknevičius, Marius; Antonovič, Valentin (Procedia Engineering, 2013)The early hydration (up to 24h) of calcium aluminate cement (Al2O3 min. 40%) blended with spent FCC catalyst at two temperatures i.e. 10 °C and 25 °C was investigated. The calorimetric measurements were used to study ... -
The effect of temperature on the formation of the hydrated calcium aluminate cement structure
Antonovič, Valentin; Kerienė, Jadvyga; Boris, Renata; Aleknevičius, Marius (Procedia Engineering, 2013)The effect of temperature on the formation of the structure and phase composition of the Gorkal 70 grade calcium aluminate cement (CAC) during its hydration (W/C=1) at the temperature of +5 ºC, +20 ºC and +40 ºC is ... -
Influence of waste oil-cracking catalyst on structure of alumina cement based binder
Antonovič, Valentin; Aleknevičius, Marius; Pundienė, Ina; Stonys, Rimvydas (Energia i środowiskwo w technologiach materialów budowlanych, ceramicznych, szklarskich i ogniotrwałych : praca zbiorowa. Warszawa-Opole, 2010 / Instytut Ceramiki i Materialów Budowlanych, 2010)The development of new advantageous refractory materials with required properties, obtained due to the additive of oil refinery waste catalyst, could give ecological and economical benefit. In this work the influence of ... -
Investigating the hydration of deflocculated calcium aluminate cement-based binder with catalyst waste
Antonovič, Valentin; Aleknevičius, Marius; Kerienė, Jadvyga Regina; Pundienė, Ina; Stonys, Rimvydas (Journal of thermal analysis and calorimetry, 2012)The hydration of the binder, consisting of calcium aluminate cement (CAC) with Al2O3[70% and with or without the additives of the FCC catalyst waste and polycarboxylate deflocculant Castament FS-20, is investigated. The ... -
Investigation of early hydration of high aluminate cement-based binder at different ambient temperatures
Pacewska, Barbara; Nowacka, Mariola; Antonovič, Valentin; Aleknevičius, Marius (Journal of thermal analysis and calorimetry, 2012)The effect of spent FCC catalyst on early hydration (up to 48 h) of high aluminate cement (Al2O3 [70%) at different ambient temperatures (10, 20, and 30 C) was investigated. Cement pastes with constant ratio of water/binder ... -
Katalitinio krekingo katalizatoriaus atliekų įtaka aliuminatinio cemento hidratacijai
Aleknevičius, Marius (12-osios Lietuvos jaunųjų mokslininkų konferencijos „Mokslas – Lietuvos ateitis“ 2009 m. teminės konferencijos " Statyba" : 2009 m. kovo 25-27 d., Vilnius : straipsnių rinkinys [CD] / Vilniaus Gedimino technikos universitetas, 2009)Naftos pramonės įmonėse susidaro nemažų katalitinio krekingo katalizatoriaus atliekų. Tai smulkiagrūdė (dalelių dydis – apie 40 μm) aliumosilikatinė medžiaga, kuri gali buti utilizuojama ugniai atspariose medžiagose su ... -
Modeling the evolution of agricultural land markets
Aleknevičius, Marius (2006) -
Modification of petrochemical fluid catalytic cracking catalyst waste properties by treatment in high temperature
Antonovič, Valentin; Baltrėnas, Pranas; Aleknevičius, Marius; Pundienė, Ina; Stonys, Rimvydas (10th International Conference Modern Building Materials, Structures and Techniques: selected papers : [CD], Vol. 1. May 19-21, 2010, 2010)Approximately 400 000 tons of waste catalysts are produced by petrochemical industry in fluidized bed catalytic cracking (FCC) process annually. In Lithuania (Mažeikiai Oil Refinery) the waste amounts up to about 200 ... -
Modification of petrochemical fluid catalytic cracking catalyst waste properties by treatment in high temperature
Antonovič, Valentin; Baltrėnas, Pranas; Aleknevičius, Marius; Pundienė, Ina; Stonys, Rimvydas (10th International Conference Modern Building Materials, Structures and Techniques: selected papers. May 19-21, 2010. Vol. 1, 2010)Approximately 400 000 tons of waste catalysts are produced by petrochemical industry in fluidized bed catalytic cracking (FCC) process annually. In Lithuania (Mažeikiai Oil Refinery) the waste amounts up to about 200 ... -
Naftos krekinge naudoto katalizatoriaus poveikis ugniai atsparių betonų savybėms
Aleknevičius, Marius (2011)Naftos krekinge naudotas katalizatorius yra ceolitinė medžiaga, kurios unikalios savybės mažai išnaudojamos cementinių medžiagų gamybos technologijoje. Ugniai atspariuose betonuose naudojami įvairūs priedai-modifikatoriai ... -
Studies on the influence of aluminosilicate additive on initiation steps of high calcium aluminate cement hydration
Pacewska, Barbara; Wilińska, Iwona; Nowacka, Mariola; Pundienė, Ina; Aleknevičius, Marius (10th International Conference Modern Building Materials, Structures and Techniques: selected papers. May 19-21, 2010. Vol. 1, 2010)Aluminate cements are applied mainly in fire-resistant concretes. The use of aluminate cements in construction materials is problematic (and sometimes even banned) because of conversion of aluminates, taking place slowly ... -
The effect of deflocculants on the structure and physical-mechanical properties of fireclay refractory castables
Pundienė, Ina; Antonovič, Valentin; Stonys, Rimvydas; Aleknevičius, Marius; Demidova-Buizinienė, Irina; Gailius, Albinas (Materials science = Medžiagotyra, 2012)For production of fireclay refractory castables, various deflocculants are used. In recent years new polycarboxylate ethers-based deflocculants appeared and so far their properties comparing to those of common deflocculants ... -
The effect of temperature on the formation of the hydrated calcium aluminate cement structure
Antonovič, Valentin; Kerienė, Jadvyga Regina; Boris, Renata; Aleknevičius, Marius (Procedia Engineering. 11th international conference on modern building materials, structures and techniques (MBMST), May 16-17, 2013, Vilnius, Lithuania, 2013)The effect of temperature on the formation of the structure and phase composition of the Gorkal 70 grade calcium aluminate cement (CAC) during its hydration (W/C=1) at the temperature of +5 °C, +20 °C and +40 °C is ... -
The effect of waste oil-cracking catalyst on the properties of MCC-type castable
Stonys, Rimvydas; Pundienė, Ina; Antonovič, Valentin; Goberis, Stasys Algimantas; Aleknevičius, Marius (Materials science = Medžiagotyra: Presented at the National conference “Materials engineering’ 2007” (Kaunas, Lithuania, November 16, 2007), 2008)In this study a possibility to use the waste oil-cracking catalyst from fluidized cracking in the production of middle cement castable (MCC) was investigated. Viscosity tests of cement paste as well as dilatometric, X-ray ... -
The influence of multi-walled carbon nanotubes additive on properties of non-autoclaved and autoclaved aerated concretes
Kerienė, Jadvyga Regina; Kligys, Modestas; Laukaitis, Antanas; Yakovlev, Grigory; Špokauskas, Alfonsas Algimantas; Aleknevičius, Marius (Construction and building materials, 2013)The influence of multi-walled carbon nanotubes (MWCNTs) additive on characteristics of non-autoclaved aerated concrete (NAC) and autoclaved aerated concrete (AAC) was investigated. It was established that MWCNTs used as ... -
The influence of oil cracking catalyst waste on the properties of refractory castables
Aleknevičius, Marius (2011)Fluidized bed catalytic cracking catalyst waste is a zeolite material. Its unique properties are underused in cementitious materials production technology. Various additives, modifiers used in refractory castables are very ... -
Ugniai atsparaus betono kompozicija : patentas
Antonovič, Valentin; Aleknevičius, Marius; Pundienė, Ina; Stonys, Rimvydas (2011)Išradimas priklauso statybos pramonės sričiai, būtent ugniai atsparių betonų kompozicijoms, tiksliau ugniai atsparių betonų su katalizatoriaus atliekų priedų kompozicijoms. Išradimo tikslas - pagerinti fizikines, eksploatacines ... -
Žemės ūkio paskirties žemės rinkų raidos modeliavimas
Aleknevičius, Marius (2007)