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    Wyświetlanie 1-3 z 3
    Tytuł:
    Jak zwiększyć przyczepność stal zbrojeniowa-beton?
    Influence of casting direction on bond to steel reinforcing bars in self-copmacting concrete
    Autorzy:
    Kucharska, Milena
    Dybeł, Piotr
    Powiązania:
    https://bibliotekanauki.pl/articles/128966.pdf
    Data publikacji:
    2019
    Wydawca:
    PWB MEDIA Zdziebłowski
    Tematy:
    przyczepność
    stal zbrojeniowa
    efekt top-bar
    beton samozagęszczalny
    badanie przyczepności
    kierunek betonowania
    bond
    reinforcing steel
    top-bar effect
    self-compacting concrete
    pull-out test
    casting direction
    Opis:
    The paper analyses the impact of casting direction of self-compacting concrete (SCC) on its bond quality to steel reinforcing bars. Tests were performed on high performance self-compacting concretes with different amount of silica fume to cement mass. Experiment was carried out on 480 mm height specimens, which allowed determining changes of bond condition along its height. The ribbed reinforcing bars have been placed perpendicularly to the direction of casting. Casting was performed from two points – from the bottom and the top of the form. Research has shown that casting from the bottom of the form improves bond strength and quality.
    Źródło:
    Builder; 2019, 23, 1; 65-67
    1896-0642
    Pojawia się w:
    Builder
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Evaluation of Tunnel Contour Quality Index on the Basis of Terrestrial Laser Scanning Data
    Autorzy:
    Dybeł, Piotr
    Dybeł, Katarzyna
    Cieślik, Jerzy
    Powiązania:
    https://bibliotekanauki.pl/articles/1845142.pdf
    Data publikacji:
    2021
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    TCI
    tunnel
    contour quality
    terrestrial laser scanning
    TLS
    overbreak
    contour roughness
    Opis:
    The Tunnel Contour Quality Index (TCI) is an index established by Kim and Bruland for an effective management of a tunnel contour quality. It is estimated on a basis of measurements of two contour profiles within a single blasting round, using a laser profiler. However, the representativeness of measurement results obtained that way for the assessment of a contour quality of the entire blasting round is disputable. Terrestrial laser scanning (TLS) technology, combined with available numerical surface modeling tools, enables development of three-dimensional models of a monitored surface. The article reports results of TCI calculations based on TLS data. The presented TLS technique is based not only on selected cross-sections of the tunnel contour but also on the description of the morphology of the tunnel contour surface. The case study concerns measurements of the "Mały Luboń" tunnel niche, located in Naprawa, Poland. The TCI values for three blasting rounds were determined in accordance with Kim and Bruland’s guidelines and were compared to TCI values determined with the proposed TLS technique. On a basis of this comparison, it can be concluded that the results obtained with the TLS technique are more reliable and representative for description of the contour quality of the entire blasting round than results obtained with the laser profiling technique.
    Źródło:
    Studia Geotechnica et Mechanica; 2021, 43, 3; 255-269
    0137-6365
    2083-831X
    Pojawia się w:
    Studia Geotechnica et Mechanica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Potential for tunnel technology in the development of hyperloop vacuum rail
    Autorzy:
    Piotr, Gospodarczyk
    Stopka, Grzegorz
    Dybeł, Piotr
    Powiązania:
    https://bibliotekanauki.pl/articles/2064333.pdf
    Data publikacji:
    2020
    Wydawca:
    STE GROUP
    Tematy:
    hyperloop
    tunneling
    low-pressure ultra-speed trains
    vacuum tube ultra-speed train
    system transportowy
    tunelowanie
    pociąg ultraszybki
    Opis:
    Hyperloop is a new concept of transport system the main assumption of which is to use hermetic tunnels where air pressure is very low compared to atmospheric pressure. It enables significant reduction of traffic resistance and, as a result, energy consumption. One of the most important elements of this system is land infrastructure with transport tubes. This system component has a significant impact on the construction costs related to the whole system and affects its functional parameters (e.g. capsule travel speed). Appropriate configuration of the route of a new transport system will require the use of all possible ways of leading transport tubes, including tunneling. The paper presents the key premises that prove a large potential application of tunnel technologies in the development of a new transport system.
    Źródło:
    New Trends in Production Engineering; 2020, 3, 1; 472--480
    2545-2843
    Pojawia się w:
    New Trends in Production Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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