نوع مقاله : علمی - پژوهشی
نویسندگان
1 دانشجوی دکتری، دانشکده فنی مهندسی، دانشگاه آزاد اسلامی واحد قزوین، قزوین، ایران.
2 استادیار، دانشکده فنی مهندسی، دانشگاه آزاد اسلامی واحد قزوین، قزوین، ایران.
چکیده
کلیدواژه‌ها
موضوعات
عنوان مقاله [English]
نویسندگان [English]
the present study, the laboratory examination of compressive and flexural strengths of concrete samples made with recycled materials, steel fibers and PVA was done at different ages.the presence of recycled aggregates instead of natural aggregates on the compressive and flexural strengths of non-fiber concrete at the ages of 3, 7, 28, 56, and 90 days was examined.Then, by adding different percentages of steel fibers ,PVA including 0.5, 1, 1.5،, and 2 to concrete with natural and recycled materials, we compared their compressive and flexural strengths in the mentioned ages.The results revealed that the compressive and flexural strengths of concrete samples made with natural materials are always higher than recycled materials.Also, comparing the compressive strength of concrete samples with the percentage of different fibers revealed that the highest compressive strength was related to the samples made with natural materials with 0.5% and the lowest compressive strength was related to the concrete samples made with recycled materials with 2% PVA fibers.Additionally,the flexural strength of the samples with PVA fibers is far less than the steel fibers of the same age and the same fiber percentages.By increasing the percentage of steel fibers and PVA from 0.5 to 2%, the flexural strength of the samples also increases.In all ages of concrete, the highest flexural strength is related to concrete samples made with natural materials with 2% steel fibers and the lowest compressive strength is also related to samples made with recycled materials with 0.5% PVA fibers.higher percentage of steel fibers and PVA in concrete leads to a reduction in the stone materials, and thus, a reduction in the compressive strength of concrete, which is more significant in steel fibers due to the higher density of steel fibers compared to PVA fibers.Also, due to the increase in the elasticity of concrete, its flexural strength increases.
کلیدواژه‌ها [English]
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