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Wyświetlanie 1-2 z 2
Tytuł:
Influence of hybrid fibers on toughness behavior of high strength flowing concrete
Autorzy:
Dawood, E. T.
Ramli, M.
Powiązania:
https://bibliotekanauki.pl/articles/231175.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
włókno hybrydowe
ciągliwość
beton wysokiej wytrzymałości
beton płynny
hybrid fiber
toughness
high strength concrete
flowing concrete
Opis:
This study investigates the use of steel fibers and hybrid composite with a total fibers content of 2% on the high strength flowing concrete and determines the density, compressive strength, static modulus of elasticity, flexural strength and toughness indices for the mixes. The results show that the inclusion of more than 0.5% of palm fibers in hybrid fibers mixes reduces the compressive strength. The hybrid fibers can be considered as a promising concept and the replacement of a portion of steel fibers with palm fibers can significantly reduce the density, enhance the flexural strength and toughness. The results also indicates that the use of hybrid fibers (1.5 steel fibers + 0.5% palm fibers) in specimens increases significantly the toughness indices and thus the use of hybrid fibers combinations in reinforced concrete would enhance their flexural toughness & rigidity and enhance their overall performances.
Źródło:
Archives of Civil Engineering; 2011, 57, 3; 249-260
1230-2945
Pojawia się w:
Archives of Civil Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
X-Ray CT inspection of subsurface areas of concretes exposed to fast flowing liquids
Autorzy:
Sitek, Libor
Hlaváček, Petr
Souček, Kamil
Bodnárová, Lenka
Foldyna, Josef
Zajícová, Vendula
Berčáková, Andrea
Foldyna, Vladimír
Powiązania:
https://bibliotekanauki.pl/articles/2064423.pdf
Data publikacji:
2019
Wydawca:
STE GROUP
Tematy:
erosion
concrete
fast flowing liquid
high-speed water jets
X-Ray CT
erozja
konstrukcja betonowa
beton
przepływy wody
badania rentgenowskie
Opis:
Concrete structures affected for a long time by flowing liquids are exposed to gradual erosion in surface layers caused by a combination of several degradation processes: abrasion, cavitation and chemical or bacterial impacts. Due to the complex phenomena and difficult-to-define initial and boundary conditions, the whole process cannot be easily simulated using the conventional computing tools. Laboratory experimental research is thus the most appropriate approach for the investigation of a suitable composition of concrete resistant to the flowing liquids. However, the methods used are often very time consuming and last even several years. High-speed water flows can be elegantly used for the acceleration of the mechanical simulation of a real situation. Several experiments on the effects of the high-speed water flows on concrete surfaces have been carried out. Using the X-Ray CT methods, subsurface structures of concretes exposed to the accelerated mechanical simulation of the erosion wear caused by fast flowing liquids were investigated and presented in the article. It has been shown that the simulation does not cause initiation of new fractures or cracks in the original concrete structure. The pure water flow mainly removes the hardened cement paste and reveals the aggregate grains. The water flow with abrasive particles disintegrates in greater depths and washes out entire aggregate grains, eventually amputates them and finally smoothens entire surface.
Źródło:
New Trends in Production Engineering; 2019, 2, 1; 450--459
2545-2843
Pojawia się w:
New Trends in Production Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-2 z 2

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