نوع مقاله : علمی - پژوهشی
نویسندگان
1 مربی، گروه مهندسی عمران، واحد کرمانشاه، دانشگاه آزاد اسلامی، کرمانشاه، ایران
2 کارشناسی ارشد، گروه مهندسی عمران، دانشگاه آزاد اسلامی واحد بروجرد، بروجرد، ایران
چکیده
کلیدواژه‌ها
موضوعات
عنوان مقاله [English]
نویسندگان [English]
In order to reduce the weight of structures, reduce dead load and improve seismic performance, lightweight concrete can be used. Due to the use of lightweight materials that have a brittle and porous structure, the mechanical properties and durability of lightweight concrete are weaker than ordinary concrete. To improve the weaknesses of lightweight concrete, optimal amounts of fibers can be used in lightweight concrete mix design. In this article, the effect of using different amounts of polymer fibers and basalt, single and combined, on the mechanical properties and durability was investigated. A number of 124 cylindrical samples with a size of 300 x 150 mm were made for compressive strength and tensile strength tests. Also, 248 cylindrical samples with a size of 200 x 100 mm were made for tests. Experiments were performed on different samples for the ages of 28 and 90 days. The results showed that the addition of 1% polymer fibers increased the compressive strength by 24.4% and 26.92%, and the tensile strength by 66.12% and 72.22%, as well as the addition of 1.75% basalt fibers. increases by 18.13% and 14.93% and tensile strength by 41.93% and 47.22% at the ages of 28 and 90 days compared to the sample without fibers. Also, the addition of 1.25% basalt fibers had the best performance in improving the durability of lightweight concrete, so the amount of final water absorption of lightweight concrete decreased to 31.93% and 45.38%. Adding the optimal amount of fibers increased the electrical resistance to 46.54% -46.42%, and also caused the penetration of chloride ions into lightweight concrete at the ages of 28 and 90 days by 39.67% and 43.15% respectively. be reduced to a fiber-free sample. it was concluded that polymer fibers have the greatest effect in improving the mechanical properties of lightweight concrete.
کلیدواژه‌ها [English]
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