Naršyti pagal autorių "Balčiūnas, Giedrius"

Dabar rodomi įrašai 1-20 iš 52

    • Alkali-silica reactivity of Portland-composite cements and gravel aggregates 

      Žvironaitė, Jadvyga; Pranckevičienė, Jolanta; Kligys, Modestas; Balčiūnas, Giedrius; Macanovskis, Arturs (Ceramics-Silikáty, 2019)
      The potential alkali-silica reactivity (ASR) of various combinations of Portland-composite cements CEM II/A, and Lithuanian aggregates from three gravel deposits are investigated in this work. These aggregates which contain ...

    • Assessment of structure influence on thermal conductivity of hemp shives composite 

      Balčiūnas, Giedrius; Vėjelis, Sigitas; Lekūnaitė-Lukošiūnė, Lina; Kremensas, Arūnas (Environmental engineering and management journal, 2016)
      In past ten years area of green technologies and materials was the most growing industry sector in the world. It is related wit h global warming, air pollution and energy saving. Building sector intensively increased air ...

    • Brushite mineralised Scots pine (Pinus sylvestris L.) sapwood – revealing mineral crystallization within a wood matrix by in situ XRD 

      Garškaitė, Edita; Balčiūnas, Giedrius; Drienovsky, Marian; Sokol, Denis; Sandberg, Dick; Bastos, Alexandre C.; Salak, Andrei N. (RSC Advances, 2023)
      Dicalcium phosphate dihydrate (CaHPO 4 ·2H 2 O, DCPD, brushite) crystals were synthesised within Scots pine sapwood via a wet-chemistry route from aqueous solutions of Ca(CH 3 COO) 2 and NH 4 H 2 PO 4 salts. SEM/EDS analysis ...

    • Closed cell rigid polyurethane foams based on low functionality polyols: research of dimensional stability and standardised performance properties 

      Kairytė, Agnė; Kremensas, Arūnas; Balčiūnas, Giedrius; Czlonka, Sylwia; Strąkowska, Anna (Materials: Special issue: Performance research of polyurethane foams and composites, 2020)
      Currently, polyurethane foam producers come across the several problems when petroleum-based polyols are replaced with low functionality biomass, or waste-based, polyols. In addition, the dilemma is intensified with ...

    • Development of thermal insulation from local agricultural waste 

      Vėjelienė, Jolanta; Gailius, Albinas; Vėjelis, Sigitas; Vaitkus, Saulius; Balčiūnas, Giedrius (8th International Conference "Environmental Engineering", May 19-20, 2011, Vilnius, Lithuania : selected papers. Vol. 1. Environmental protection, 2011)
      In Lithuania yearly composes large quantity of waste during processing of agricultural plants. Large quantity of these waste amounts a straw. A small part of straw is used for biofuel, the remaining part of straw is chopped ...

    • Development of thermal insulation from local agricultural waste 

      Vėjelienė, Jolanta; Gailius, Albinas; Vėjelis, Sigitas; Vaitkus, Saulius; Balčiūnas, Giedrius (8th International Conference "Environmental Engineering", May 19-20, 2011, Vilnius, Lithuania CD, 2011)
      In Lithuania yearly composes large quantity of waste during processing of agricultural plants. Large quantity of these waste amounts a straw. A small part of straw is used for biofuel, the remaining part of straw is chopped ...

    • Development of thermal insulation from local agricultural waste 

      Vejelienė, Jolanta; Gailius, Albinas; Vėjelis, Sigitas; Vaitkus, Saulius; Balčiūnas, Giedrius (8th International Conference “Environmental Engineering” (ICEE-2011), 2011)
      In Lithuania yearly composes large quantity of waste during processing of agricultural plants. Large quantity of these waste amounts a straw. A small part of straw is used for biofuel, the remaining part of straw is chopped ...

    • Ecological, thermal and acoustical insulating composite from hemp shives and sapropel binder 

      Balčiūnas, Giedrius; Žvironaitė, Jadvyga; Vėjelis, Sigitas; Jagniatinskis, Aleksandras; Gaidučis, Sergejus (Industrial crops and products : an international journal, 2016)
      The technological parameters for the production of hemp shives (HS) composite with organic sapropel binder and reinforcement additive – paper production waste (PPW) is developed and properties of this composite are ...

    • Effect of propylene glycol, rapeseed glycerine, and corn starch modified polyol blends parameters on the properties of thermal insulating polyurethane foams 

      Kairytė, Agnė; Vaitkus, Saulius; Pundienė, Ina; Balčiūnas, Giedrius (Journal of cellular plastics, 2019)
      Water-blown polyurethane foams have some drawbacks such as intensive shrinkage, relatively high density, skin peeling phenomena post blowing, and longer demold time. These drawbacks can be partially or fully eliminated by ...

    • Evaluation of self-thermally treated wood plastic composites from wood bark and rapeseed oil-based binder 

      Kairytė, Agnė; Kremensas, Arūnas; Balčiūnas, Giedrius; Matulaitienė, Ieva; Czlonka, Sylwia; Sienkiewicz, Natalia (Construction and building materials, 2020)
      In order to construct sustainable and approachable buildings it is necessary to develop efficient building materials (thermal insulation, structural and sound-absorbing) with lower environmental impact, especially regarding ...

    • Evaluation of structure influence on thermal conductivity of thermal insulating materials from renewable resources 

      Vėjelienė, Jolanta; Gailius, Albinas; Vėjelis, Sigitas; Vaitkus, Saulius; Balčiūnas, Giedrius (Materials science = Medžiagotyra, 2011)
      The development of new thermal insulation materials needs to evaluate properties and structure of raw material, technological factors that make influence on the thermal conductivity of material. One of the most promising ...

    • Fabrication and investigation of high-quality glass-ceramic (GC)–polymethyl methacrylate (PMMA) composite for regenerative medicine 

      Golubevas, Ričardas; Žarkov, Aleksej; Alinauskas, Laurynas; Stankevičiūtė, Živilė; Balčiūnas, Giedrius; Garškaitė, Edita; Kareiva, Aivaras (RSC advances, 2017)
      The preparation of a glass-ceramic (GC)–polymethyl methacrylate (PMMA) composite material is reported. Precursor GC powders were synthesised via sol–gel method at 600 C. XRD analysis revealed the formation of sodium calcium ...

    • Flammability studies of a pine sawdust coated with multicomponent suspension 

      Augaitis, Nerijus; Vaitkus, Saulius; Kairytė, Agnė; Balčiūnas, Giedrius; Kremensas, Arūnas; Vėjelis, Sigitas (International conference for young scientists on biorefinery technologies and products (BTechPro!2022), April 27-29, 2022, Riga, Latvia : book of abstracts, 2022)
      This paper reports results of developed multicomponent suspension for pine sawdust, which improves physical properties, resistant to fire. Currently, wood and agricultural wastes are used for biofuel production thus providing ...

    • Impact of cellulolytic fungi on biodegradation of hemp shives and corn starch-based composites with different flame-retardants 

      Vasiliauskienė, Dovilė; Boris, Renata; Balčiūnas, Giedrius; Kairytė, Agnė; Urbonavičius, Jaunius (Microorganisms, 2022)
      Biocomposite boards (BcBs) composed of hemp shives and corn starch are known as thermal insulating or structural building materials. Therefore, they must be stable during exploitation. However, BcBs are exposed to ...

    • Impact of hemp shives aggregate mineralization on physical–mechanical properties and structure of composite with cementitious binding material 

      Balčiūnas, Giedrius; Pundienė, Ina; Lekūnaitė-Lukošiūnė, Lina; Vėjelis, Sigitas; Korjakins, Aleksandrs (Industrial crops and products : an international journal, 2015)
      This article analyses the possibility of fibre hemp shives (FHS) to be used as lightweight aggregate in composite with cement binding material. Cement and plant origin aggregates are hardly compatible, because water-soluble ...

    • Influence of Micro additives on Macrostructure of Autoclavedaerated Concrete 

      Lekūnaitė-Lukošiūnė, Lina; Balčiūnas, Giedrius; Kligys, Modestas (International journal of engineering science invention, 2017)
      Autoclaved aerated concrete (AAC) is a construction material with porous macrostructure prepared of finely milled siliceous aggregate, lime, water and Portland cement with the addition of aluminium powder and being steam-cured ...

    • Influence of multicomponent suspension on assessment of physical properties of loose-fill thermal insulating materials from pine sawdust 

      Augaitis, Nerijus; Vaitkus, Saulius; Kairytė, Agnė; Kremensas, Arūnas; Vėjelis, Sigitas; Balčiūnas, Giedrius (International conference binders and materials, ICBM, 2 December 2021, Brno University of Technology, Czech Republic, 2021)
      Currently, wood and agricultural wastes are used for biofuel production thus providing short-term benefits. The use of these waste materials in the production of thermal insulating materials would bring long-term benefits ...

    • Investigation of energy efficient thermal insulating composites from hemp shives and starch 

      Kremensas, Arūnas; Vaitkus, Saulius; Vėjelis, Sigitas; Kairytė, Agnė; Balčiūnas, Giedrius (International journal of engineering science invention, 2017)
      This work presents the investigation results of physical-mechanical properties of fibrous hemp composite specimens produced from hemp shives and starch used as a binding material. For this purpose specimens with different ...

    • Investigation of the influence of paraffin production wastes on the properties of ceramic articles 

      Pranckevičienė, Jolanta; Pundienė, Ina; Balkevičius, Valdas; Balčiūnas, Giedrius (Glass and ceramics, 2019)
      The possibility of using paraffin production wastes (PPW; 2.5 – 10 wt.%) in the production of porous ceramic was investigated. The addition of 2.5% PPW increases the strength of the ceramic in compression. Increasing PPW ...

    • Isolation and identification of fungi growing on fibre hemp shive based thermal insulation materials 

      Vasiliauskienė, Dovilė; Balčiūnas, Giedrius; Urbonavičius, Jaunius (21-osios Lietuvos jaunųjų mokslininkų konferencijos „Mokslas – Lietuvos ateitis“ teminė konferencija "Aplinkos apsaugos inžinerija", 2018 m. kovo 20 d. Vilnius = Proceedings of the 21th Conference for Junior Researchers „Science – Future of Lithuania“ "Environmental protection engineering", 20 March 2018, Vilnius, Lithuania, 2018)
      Green thermal insulation materials are ecological materials with hemp, linen, jute, wood waste, maize starch, and other types of waste added to polymer-based composites. Such kind of materials are susceptible to the microbial ...