Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Cementitious materials with hybrid fibers exposed to high temperatures
Extreme environmental conditions, such as exposure to high temperatures, are serious potential risks for buildings and structures. The behavior of concrete, after exposure to a high temperature, depends upon the specific concrete mix proportions, the constituents used and the physicochemical transformations that the heating generates. Within this context, the damage, after thermal treatments, in cement-based matrices was studied using compression and three-point bending tests. Four types of high performance cement based composites were prepared using fiber combinations of polypropylene and steel fibers. Specimens were treated in an electric furnace at 250 deg C, 500 deg C and 750 deg C. The corresponding compressive and bending strengths were determined, and fracture behavior was studied using interferometric measurements. A physical analysis was also performed by the Use of Mercury Intrusion Porosimetry (MIP) and microscopy observation (SEM). For the considered combinations, it was demonstrated that a hybrid mixture of steel and polypropylene fibers appears to be not particularly effective in enhancing the performance of concrete at high temperatures. With the considered heating rate, explosive spalling was not observed in concrete specimens during the thermal treatment, but a melting of steel fibers after the treatment at 750 deg C was detected.
Cementitious materials with hybrid fibers exposed to high temperatures
Extreme environmental conditions, such as exposure to high temperatures, are serious potential risks for buildings and structures. The behavior of concrete, after exposure to a high temperature, depends upon the specific concrete mix proportions, the constituents used and the physicochemical transformations that the heating generates. Within this context, the damage, after thermal treatments, in cement-based matrices was studied using compression and three-point bending tests. Four types of high performance cement based composites were prepared using fiber combinations of polypropylene and steel fibers. Specimens were treated in an electric furnace at 250 deg C, 500 deg C and 750 deg C. The corresponding compressive and bending strengths were determined, and fracture behavior was studied using interferometric measurements. A physical analysis was also performed by the Use of Mercury Intrusion Porosimetry (MIP) and microscopy observation (SEM). For the considered combinations, it was demonstrated that a hybrid mixture of steel and polypropylene fibers appears to be not particularly effective in enhancing the performance of concrete at high temperatures. With the considered heating rate, explosive spalling was not observed in concrete specimens during the thermal treatment, but a melting of steel fibers after the treatment at 750 deg C was detected.
Cementitious materials with hybrid fibers exposed to high temperatures
Biolzi, Luigi (Autor:in) / Guerrini, Gian Luca (Autor:in) / Bertolini, Luca (Autor:in)
2004
12 Seiten, 9 Bilder, 3 Tabellen, 18 Quellen
Aufsatz (Konferenz)
Englisch
Mischungsverhältnis , Einflussfaktor , Hochtemperaturbeständigkeit , Feuerbeständigkeit , Druckfestigkeit , Biegeversuch , Polypropylenfaser , Stahlfaser , Faserbeton , Bruchverlauf , Versuchsbeschreibung , Versuchsergebnis , Interferometrie , Porositätsmessung , REM (Rasterelektronenmikroskop) , Hybridfaser , Werkstoffeignung , Werkstoffeigenschaft , Verbundwerkstoff , Verbundwerkstoffmechanik
Cementitious materials with hybrid fibers exposed to high temperatures
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