نوع مقاله : علمی - پژوهشی
نویسندگان
1 دانشجوی دکتری، گروه مهندسی عمران، واحد شاهرود، دانشگاه آزاد اسلامی، شاهرود، ایران
2 استادیار دانشکده فنی و مهندسی، واحد شاهرود، دانشگاه آزاد اسلامی، شاهرود، ایران
3 استادیار، گروه مهندسی عمران، واحد شاهرود، دانشگاه آزاد اسلامی، شاهرود، ایران
4 دکتری مهندسی عمران، دانشکده عمران و محیط زیست (آزمایشگاه بتن و مصالح ساختمانی)، دانشگاه صنعتی امیرکبیر، تهران، ایران
چکیده
کلیدواژه‌ها
موضوعات
عنوان مقاله [English]
نویسندگان [English]
Concrete is one of the most widely used materials in the current century. At high temperatures, due to high thermal stresses and low tensile strength, this material suffers from problems such as cracking, crumbling, or disintegration. In this research, concrete samples have been reinforced using steel and polypropylene fibers and subjected to different temperatures from 25 degrees to 800 °C, and compressive and tensile strength tests have been performed on the samples. In order to better examine the results, a concrete sample containing lightweight aggregate was also prepared and tested along with other samples. The test results showed that with the addition of steel and polypropylene fibers, the compressive strength up to the temperature of 200 °C is higher or similar to the control sample. Also, the tensile strength test results showed that samples containing steel fibers had the highest tensile strength at all temperatures. The results of the compressive and tensile strength test also displayed that at temperatures of 600 °C and above, the lightweight concrete sample has a higher or similar strength to the control sample. Polypropylene fibers start to melt at 400 °C, which has caused a drop in compressive and tensile strength in samples containing this type of fibers at temperatures above 400 °C.
کلیدواژه‌ها [English]
)