Yazar "Szechynska-Hebda, Magdalena" seçeneğine göre listele

Listeleniyor 1 - 3 / 3
  • Küçük Resim Yok
    Öğe
    Eco-Friendly Fired Brick Produced from Industrial Ash and Natural Clay: A Study of Waste Reuse
    (Mdpi, 2021) Dogan-Saglamtimur, Neslihan; Bilgil, Ahmet; Szechynska-Hebda, Magdalena; Parzych, Slawomir; Hebda, Marek
    Bottom ash (BA) is an industrial solid waste formed by the burning of coal. The environmental problems and storage costs caused by this waste increase with every passing day. In this study, the use of BA as an additive (clay substitute) in fired brick production was investigated. The study consisted of two stages. In the first stage, cylinder blocks were produced from clay used in brick production. The second stage was the examination of the experimental substitution of clay with 10, 20, 30 and 40% BA. Samples were fired at 900, 1000, 1100 and 1150 degrees C to produce fired brick samples. The unit weight, compressive strength (before and after freeze-thawing) and water absorption were analyzed for the samples. The unit weight values decreased in the samples containing BA. The mechanical properties met the conditions prescribed in the relevant standards; i.e., all of the samples fired at 1100 and 1150 degrees C had a sufficient compressive strength over 20 MPa. The high potential of fired bricks for the construction industry was proved. BA can be used as a clay substitute, while the developed protocol can be used to effectively produce fired bricks.
  • Küçük Resim Yok
    Öğe
    Let's Print an Ecology in 3D (and 4D)
    (Mdpi, 2024) Szechynska-Hebda, Magdalena; Hebda, Marek; Dogan-Saglamtimur, Neslihan; Lin, Wei-Ting
    The concept of ecology, historically rooted in the economy of nature, currently needs to evolve to encompass the intricate web of interactions among humans and various organisms in the environment, which are influenced by anthropogenic forces. In this review, the definition of ecology has been adapted to address the dynamic interplay of energy, resources, and information shaping both natural and artificial ecosystems. Previously, 3D (and 4D) printing technologies have been presented as potential tools within this ecological framework, promising a new economy for nature. However, despite the considerable scientific discourse surrounding both ecology and 3D printing, there remains a significant gap in research exploring the interplay between these directions. Therefore, a holistic review of incorporating ecological principles into 3D printing practices is presented, emphasizing environmental sustainability, resource efficiency, and innovation. Furthermore, the 'unecological' aspects of 3D printing, disadvantages related to legal aspects, intellectual property, and legislation, as well as societal impacts, are underlined. These presented ideas collectively suggest a roadmap for future research and practice. This review calls for a more comprehensive understanding of the multifaceted impacts of 3D printing and the development of responsible practices aligned with ecological goals.
  • Küçük Resim Yok
    Öğe
    Process Design for a Production of Sustainable Materials from Post-Production Clay
    (Mdpi, 2021) Lach, Michal; Gado, Reda A.; Marczyk, Joanna; Ziejewska, Celina; Dogan-Saglamtimur, Neslihan; Mikula, Janusz; Szechynska-Hebda, Magdalena
    Alkali activated cement (AAC) can be manufactured from industrial by-products to achieve goals of zero-waste production. We discuss in detail the AAC production process from (waste) post-production clay, which serves as the calcium-rich material. The effect of different parameters on the changes in properties of the final product, including morphology, phase formation, compressive strength, resistance to the high temperature, and long-term curing is presented. The drying and grinding of clay are required, even if both processes are energy-intensive; the reduction of particle size and the increase of specific surface area is crucial. Furthermore, calcination at 750 degrees C ensure approximately 20% higher compressive strength of final AAC in comparison to calcination performed at 700 degrees C. It resulted from the different ratio of phases: Calcite, mullite, quartz, gehlenite, and wollastonite in the final AAC. The type of activators (NaOH, NaOH:KOH mixtures, KOH) affected AAC mechanical properties, significantly. Sodium activators enabled obtaining higher values of strength. However, if KOH is required, the supplementation of initial materials with fly ash or metakaolin could improve the mechanical properties and durability of AAC, even c.a. 28%. The presented results confirm the possibility of recycling post-production clay from the Raciszyn II Jurassic limestone deposit.