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    Wyświetlanie 1-3 z 3
    Tytuł:
    Risk assessment of tunnel portals in the construction stage based on fuzzy analytic hierarchy process
    Autorzy:
    Deng, Xianghui
    Wang, Rui
    Xu, Tian
    Powiązania:
    https://bibliotekanauki.pl/articles/230450.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    portal tunelu
    etap budowy
    proces rozmytej hierarchii analitycznej
    FAHP
    ocena ryzyka
    tunnel portal
    construction stage
    fuzzy analytic hierarchy process
    risk assessment
    Opis:
    This study presents a fuzzy analytic hierarchy process (FAHP) by integrating analytic hierarchy process (AHP) and fuzzy cognition to evaluate the construction risks of tunnel portals. Wuguanyi Tunnel is taken as the research objective to validate the performance of the proposed method. The result shows that the proposed decision making method can effectively identify risk factors and determine the risk level during the construction of tunnel portals. Finally, the corresponding control measures during the construction of the Wuguanyi Tunnel portal are proposed according to the risk assessment results.
    Źródło:
    Archives of Civil Engineering; 2018, 64, 4/I; 69-87
    1230-2945
    Pojawia się w:
    Archives of Civil Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigating freeze-proof durability of air-entrained C30 recycled coarse aggregate concrete
    Autorzy:
    Deng, Xianghui
    Liu, Yiyuan
    Wang, Rui
    Powiązania:
    https://bibliotekanauki.pl/articles/1852544.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    domieszka napowietrzająca
    kruszywo gruboziarniste
    kruszywo z recyklingu
    cykl zamrażanie-odmrażanie
    mrozoodporność betonu
    air-entraining admixture
    recycled aggregate
    coarse aggregate
    concrete
    freeze-thaw cycle
    freeze-proof durability
    Opis:
    Incorporation of air-entraining agent has improved recycled concrete freeze-proof durability. However, it is very lacking to study the role of the entraining agent. In this paper, the influence of an air-entraining agent on freeze-proof durability for the ordinary C30 recycled coarse aggregate (RCA) concrete and air-entrained C30 RCA concrete was investigated with the laboratory comparative tests. The mass loss, the dynamic modulus of elasticity, ultrasonic wave velocity and cubic compressive strength were measured during freeze-thaw cycles. The test result showed the concrete’s performance was similar to the ordinary concrete and was better than that of other recycled concretes when the content of RCA was 50% and 0.03% of air-entraining agent was added for C30 RCA concrete. Meanwhile, the addition of air-entraining agent has an improved effect on the performance of recycled concrete, but the effect was limited.
    Źródło:
    Archives of Civil Engineering; 2021, 67, 2; 507-524
    1230-2945
    Pojawia się w:
    Archives of Civil Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Freeze-proof durability of concrete incorporating recycled coarse aggregate
    Autorzy:
    Deng, Xianghui
    Xue, Liyuan
    Wang, Rui
    Gao, Xiaoyue
    Powiązania:
    https://bibliotekanauki.pl/articles/231420.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    kruszywo recyklingowe
    kruszywo gruboziarniste
    beton
    cykl zamrażanie-odmrażanie
    mrozoodporność
    recycled aggregate
    coarse aggregate
    concrete
    freeze-thaw cycle
    freeze-proof durability
    Opis:
    The recycle of the building and demolition waste could reduce project expenses and save natural resources as well as solve problem about environmental risks incurred during the disposal of building waste. In this study, waste C30 concrete is taken an experimental material. The mass loss, ultrasonic velocity, dynamic modulus of elasticity and cubic compressive strength of recycled coarse aggregate concrete whose coarse aggregate replacement percentage is 25%, 50%, 75%, and 100% are tested and compared with NAC when the cycles of freezing and thawing are 0, 25, 50, 75, 100, 125, 150, 175, and 200 times. The results show: (1) Generally, the loss of mass, ultrasonic velocity, dynamic modulus of elasticity and cubic compressive strength constantly increase with the growth of freezing and thawing cycles. (2) Compared with the recycled concrete of other replacement percentages, the RAC50 shows relatively close performance to NAC in mass loss, the change of dynamic modulus of elasticity and cubic compressive strength. (3) Performances of RAC25 specimens are better than the other RAC specimens for the ultrasonic wave velocity.
    Źródło:
    Archives of Civil Engineering; 2019, 65, 4; 63-80
    1230-2945
    Pojawia się w:
    Archives of Civil Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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