چکیده مقاله
A major weakness of concrete is its brittleness, especially in tension Using fibers has been an effective way for improving concrete toughness The use of fiber reinforced concrete FRC is thus increasing and the most widely used has been steel fibers The common polymeric micro fibers do not have a significant effect on concrete toughness This is mainly due to the restriction on the volume fraction of these fibers that can be used before severing difficulties with regards to their dispersion and concrete workabilityoccurs In recent years, new generation of polymer fibers Macro fibers mainly based on polypropylene with modified performance have became available to the construction industry With increased diameter and length, possibility of using higher volume fraction of these macro fibers is possible Furthermore the enhanced mechanical properties of macro polymer fibers have provided a potential for significantimprovement of concrete toughness In this research the influence of different fibers including steel, and polymeric micro fiber and macro fibers, on concrete mechanical properties including first crack strength and flexural toughness has been investigated Results show that macro fibers improve the toughness of concrete for in excess of that by performance of macro fibers in improving toughness of concrete is considerably lower than steel fibers, however at higher deformation levels the macro fibers have same performance as steel fibers
کلیدواژهها
نویسندگان
علیرضا باقری
Assistant professor, Khaje Nasir Toosi university of technology
Hamed Zanganeh
Lecturer, Khaje Nasir Toosi university of technology
Mostafa Shahmoradi
M Sc structural engineering, Khaje Nasir Toosi university of technology
Ali Tadayon
AliReza Bagheri Assistant professor, Khaje Nasir Toosi university of technologyHamed Zanganeh Lecturer, Khaje Nasir Toosi university of technologyMostafa Shahmoradi M.Sc. structural engineering, Khaje Nasir Toosi university of technology
شیوه ارجاع
Bagheri, AliReza and Zanganeh, Hamed and Shahmoradi, Mostafa and Tadayon, Ali,1391,The influence of new generation of polymer fibers (Macro fibers) on concrete flexural toughness,9th International Congress on Civil Engineering,Isfahan
ارائهشده در
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