Статті КБВ

Permanent URI for this collection

http://crust.ust.edu.ua/handle/123456789/684
ENG: Articles

Browse

Browsing Статті КБВ by Author "Bordun, Maryna"

Now showing 1 - 2 of 2
  • Thumbnail Image
    Item
    Development of Test Methods in the Process of Electrically Conductive Concrete Production
    (IOP Publishing Ltd, 2024) Savytskyi, Mykola V.; Pang, Weixiang; Sun, Lijun; Savytskyi, Oleksandr M.; Bordun, Maryna; Li, Yang; Xia, Yanfang; Wang, Haojie
    ENG: Prevention of climate change, implementation of sustainable development principles in building industry, creation of Green buildings, Three-zero buildings (zero energy, zero emissions, zero waste), energy independent buildings maybe on the base of Smart Concrete. Electrically Conductive Concrete as type of Smart Concrete have the possibilities to create multifunctional hybrid structures for various purposes. The production of electrically conductive concrete is usually based on the introduction of carbon materials and carbon nanomaterials (CNMs) as electrically conductive fillers into its concrete composition. The theory of conductive percolation is used for design of electrically conductive concrete. To select electrically conductive carbon filler, it is necessary to summarize their electrically conductive characteristics. Today, there is no standard for determining the electrical conductivity of carbon fillers, nor is there a method for designing the composition of electrically conductive concrete; the development of both is imperative. Features of the preparation of electrically conductive concrete with hydrophobic carbon nanoparticles prone to aggregation are indicated. To obtain high quality electrically conductive products an operating system for quality control at the stages of the technological process of manufacturing must be proposed. Homogenization of the electrically conductive filler is very important. It is necessary to propose a method for assessing the stability of an aqueous suspension of a hydrophobic carbon material used for homogeneous distribution of a filler. Due to the lack of a standard, a method for determining the electrical conductivity of concrete is also needed.
  • Thumbnail Image
    Item
    How Much Is Needed? Discussion on Benchmarks for Primary Energy Input and Global Warming Potential Caused by Building Construction
    (MDPI, Basel, Switzerland, 2025) Rabenseifer, Roman; Kalivodová, Martina; Kononets, Yevhen; Mahas, Nataliia; Minarovičová, Katarína; Provazník, Robert; Bordun, Maryna; Shekhorkina, Svitlana; Savytskyi, Mykola V.; Savytskyi, Oleksandr M.; Semko, Volodymyr
    ENG: The operational energy efficiency of new buildings in the EU should be at the level of ultra-low or near-zero energy buildings. It is therefore relatively difficult to achieve further energy savings. However, the pre-operational phase—raw material sourcing, manufacturing, transportation, and construction—offers significant energy savings and greenhouse gas reduction opportunities, referred to as embodied energy and equivalent CO2 emissions. Unlike operational energy, no standard or legislative criteria have yet been established for embodied energy. Setting maximum embodied energy values converted to the unit of heated building area, accounting for building shape factor, and differentiating between high-mass and lightweight constructions are proposed. This study illustrates assessing environmental indicators based on building shape, highlighting the necessity of relative assessments over absolute values to favour energy efficiency. It also emphasizes that precise criteria should derive from authentic data collected during the energy certification and building permitting processes. Integrating assessments of embodied energy and operational energy demand facilitates a comprehensive evaluation of buildings’ environmental performance.