نوع مقاله : مقاله پژوهشی
نویسندگان
1 استادیار، گروه مهندسی عمران و معماری، موسسه آموزش عالی رجا، قزوین، ایران
2 کارشناسی ارشد، جهاد دانشگاهی، همدان، ایران
3 کارشناسی ارشد، گروه مهندسی عمران، دانشگاه تهران، تهران، ایران
4 کارشناسی ارشد، گروه مهندسی عمران، موسسه آموزش عالی پارسیان، قزوین، ایران
کلیدواژهها
موضوعات
عنوان مقاله English
نویسندگان English
In recent years, metakaolin is used in concrete to improve the short-term and long-term properties of concrete. Considering the importance of compressive strength and bonding between concrete and rebar in reinforced concrete structures, a new method for evaluating bonding strength between concrete and reinforcement is presented in this research. Also, the optimal percentage of metakaolin along with steel fibers has been determined in order to achieve maximum bonding and compressive strength. In this research, 20 different mixing designs with four different percentages of metakaolin (0%, 10%, 15% and 20%) and five different percentages of steel fibers (0%, 0.75%, 1%, 1.5% and 2%) were considered and slump test on fresh concrete and compressive strength and bonding strength tests on 28-day samples were conducted. The results showed that the new method presented for measuring the bonding strength between concrete and rebar is very practical. Also, minor addition of metakaolin and steel fibers significantly reduced the compressive strength, and by increasing the percentage of fibers, the compressive strength was increased and then decreased. Also, adding metakaolin up to 15% significantly increased the bonding strength of concrete, but by increasing the amount of metakaolin up to 20%, bonding strength of concrete was decreased. On the other hand, both metakaolin and steel fiber reduced the flowability of fresh concrete. Finally, the sample containing 15% metakaolin and 1.5% steel fibers showed the highest bonding strength.
کلیدواژهها English
