مهندسی سازه و ساخت

مهندسی سازه و ساخت

بررسی رفتار بتن سبک سازه ای تقویت شده با الیاف به روش آزمایشگاهی

نوع مقاله : علمی - پژوهشی

نویسندگان
1 استادیار، گروه مهندسی عمران، واحد کرمانشاه، دانشگاه آزاد اسلامی، کرمانشاه، ایران
2 گروه مهندسی عمران، واحد کرمانشاه، دانشگاه آزاد اسلامی، کرمانشاه، ایران
چکیده
استفاده از مصالح سبک طبیعی و مصنوعی راه حل مناسبی برای کاهش ابعاد سازه، به حداقل رساندن نیروی لرزه ای سازه های بتنی، افزایش سرعت و سهولت اجرا و در نهایت کاهش هزینه های ساخت و نگهداری سازه های بتنی است. در این مقاله تاثیر استفاده از سبکدانه های لیکا و پرلیت بر خواص مکانیکی بتن سبک بررسی شد. در ادامه با افزودن درصدهای مختلف الیاف بازالت و پلیمری به طرح اختلاط بتن سبک، تاثیرات الیاف بر خواص مکانیکی ذکر شده و همچنین حجم مصالح مصرفی مورد بررسی قرار گرفت. نتایج نشان داد که وزن مخصوص بتن سبک ساخته شده با لیکا و پرلیت به میزان %30-25 از بتن معمولی کمتر است، که مقاومت فشاری، مقاومت کششی و مدول الاستیسیته با وزن مخصوص رابطه مستقیم دارد. بطوریکه استفاده از سبکدانه های ذکر شده باعث کاهش مقاومت فشاری، مقاومت کششی و مدول الاستیسیته به ترتیب به میزان %75-88/44، 13/17- 36% و %30-5/8 نسبت به بتن با وزن طبیعی شد. در مقابل استفاده از درصد بهینه الیاف پلیمری باعث شد که مقاومت کششی و مدول الاستیسیته به ترتیب به مقدار %65/14و %5/21 نسبت به نمونه مرجع گروه اول (بتن با وزن نرمال) افزایش و مقاومت فشاری به مقدار ناچیز کمتر باشد. از طرفی افزودن الیاف در طرح اختلاط بتن سبک، به دلیل بهبود خواص مکانیکی، باعث صرفه جویی در مصرف مصالح، کاهش هزینه ساخت بتن سبک می شود.
کلیدواژه‌ها

موضوعات


عنوان مقاله English

Investigating the behavior of lightweight structural concrete reinforced with fibers by laboratory method

نویسندگان English

Mohsen Oghabi 1
Mehdi Khoshvatan 2
1 Assistant Professor, dept. civil engineering, Islamic Azad University, Kermanshah, Iran
2 Department of Civil Engineering, Kermanshah Branch, Islamic Azad University, Kermanshah, Iran
چکیده English

The use of natural and artificial lightweight materials is a suitable solution to reduce the dimensions of the structure, minimize the seismic force of concrete structures, increase the speed and ease of implementation, and finally reduce the costs of construction and maintenance of concrete structures. In this article, the effect of the use of Leca and Perlite aggregates on the mechanical properties of lightweight concrete was investigated. In the following, by adding different percentages of basalt and polymer fibers to the light concrete mixing plan, the effects of fibers on the mentioned mechanical properties and also the volume of consumed materials were investigated. The results showed that the specific weight of lightweight concrete made with Leca and Perlite is 25-30% lower than normal concrete, which has a direct relationship with the compressive strength, tensile strength and modulus of elasticity. So that the use of the mentioned light aggregates reduced the compressive strength, tensile strength and modulus of elasticity by 44.88-75%, 17.13-36% and 8.5-30%, respectively, compared to normal weight concrete. On the other hand, the use of the optimal percentage of polymer fibers increased the tensile strength and modulus of elasticity by 14.65% and 21.5%, respectively, compared to the reference sample of the first group (normal weight concrete), and the compressive strength was slightly lower. On the other hand, the addition of fibers in the light concrete mixing plan, due to the improvement of mechanical properties, saves the consumption of materials and reduces the cost of making light concrete.

کلیدواژه‌ها English

Structural lightweight concrete
fiber concrete
concrete behavior
compressive strength
tensile strength
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  • تاریخ دریافت 23 آذر 1402
  • تاریخ بازنگری 09 خرداد 1403
  • تاریخ پذیرش 14 تیر 1403