بررسی تاثیر حرارت بر خواص مکانیکی بتن ژئوپلیمر سرباره ای حاوی نانوسیلیس و الیاف پلی اُلفین

نوع مقاله : علمی - پژوهشی

نویسندگان

1 دانشجوی دکتری عمران سازه، گروه مهندسی عمران، واحد چالوس، دانشگاه ازاد اسلامی، چالوس، ایران

2 گروه مهندسی عمران، واحد چالوس، دانشگاه ازاد اسلامی، چالوس، ایران

3 دانشگاه آراد اسلامی واحد لاهیجان،ایران

چکیده

تولید سیمان همواره با چالش های زیست محیطی ناشی از انتشار گاز دی اکسید کربن همراه بوده است، از طرفی تولید سیمان فرایندی انرژی بر است و منجر به مصرف سوخت های فسیلی فراوان می گردد، در راستای حل این مشکل، تولید بتن ژئوپلیمر در دستور کار محققین قرار گرفت تا ضمن کاهش اثرات منفی ناشی از تولید سیمان، دارای خواصی برتر نسبت به بتن معمولی باشد. ماتریس سیمان ژئوپلیمری به دلیل تولید ژل های هیدراته فراوان، دارای تراکم و انسجام بیشتری نسبت به ماتریس سیمان پرتلند می باشد و این امر دلیل اصلی افزایش مقاومت این نوع از بتن در مواجهه با حرارت بالا نسبت به بتن معمولی است. در این پژوهش به بررسی آزمایشگاهی تاثیر حرارت بر خصوصیات مکانیکی بتن ژئوپلیمر سرباره ای حاوی0 تا 8 درصد نانوسیلیس و 1 تا 2 درصد الیاف پلی الفین در سن عمل آوری 90 روزه پرداخته شد و بمنظور بررسی ریزساختاری از آزمایش هایXRF، XRD و SEM استفاده گردید. در طرح بهینه بتن ژئوپلیمر سرباره ای(حاوی 8 درصد نانوسیلیس و فاقد الیاف)، شاهد کاهش 8 و 44 درصدی مقادیر نتایج بعد و قبل از حرارت در آزمون های مقاومت فشاری و تعیین سرعت پالس التراسونیک بتن بودیم در حالیکه در بتن کنترل، کاهش نتایج به میزان 38 و 37 درصد رسید. در بتن ژئوپلیمر سرباره ای حاوی 8 درصد نانوسیلیس و 2 درصد الیاف، مقاومت کششی و مدول الاستیسیته برابر 14 و 34 درصد کاهش نتایج بعد و قبل از حرارت را نشان داد، برای بتن کنترل این ارقام به میزان 51 و 59 درصد کاهش در نتایج حاصله رسید، نتایج آزمون ضربه چکش افتان نیز کاهش مقاومت بتن در معرض حرارت در برابر ضربات چکش را دارا بود. در پایان، بررسی های ریزساختاری در همپوشانی و هماهنگی با نتایج حاصله از آزمون های این پژوهش بودند.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Evaluate Effect Of Temperature On mechanical properties of Geopolymer Concretes blast furnace slag by using nanosilica and polyolefin fiber

نویسندگان [English]

  • mohammadhossein mansourghanaei 1
  • morteza biklaryan 2
  • Alireza Mardookhpour 3
1 Ph.D Student in Civil Engineering, Department of Civil Engineering, Chalous Branch, Islamic Azad University, Chalous, Iran
2 Department of Civil Engineering, Chalous Branch, Islamic Azad University, Chalous, Iran
3 Islamic Azad University of Lahijan ,Iran
چکیده [English]

Cement production has always been associated with environmental challenges due to carbon dioxide emissions. On the other hand, cement production is an energy-intensive process and leads to the consumption of abundant fossil fuels. In order to solve this problem, the production of geopolymer concrete is on the agenda. The researchers decided to reduce the negative effects of cement production and have superior properties than ordinary concrete . Geopolymer cement matrix, due to the production of abundant hydrated gels, has a higher density and cohesion than the Portland cement matrix, and this is the main reason for increasing the resistance of this type of concrete to high heat compared to ordinary concrete. In this study, the effect of heat on the mechanical properties of slag geopolymer concrete containing 0 to 8% nanosilica and 1 to 2% polyolefin fibers at 90 days of processing age was investigated and XRF, XRD and SEM experiments were used to study the microstructure. In the optimal design of slag geopolymer concrete (containing 8% nanosilica and free of fibers), we saw a decrease of 8 and 44% in the values after and before heating in compressive strength tests and determination of ultrasonic pulse speed of concrete, while in control concrete, the results decreased Reached 38 and 37 percent. In slag geopolymer concrete containing 8% nanosilica and 2% fibers, tensile strength and modulus of elasticity equal to 14 and 34% showed results after and before heating, for control concrete these figures decreased by 51 and 59% in the results. Received, the results of the falling hammer impact test also had a reduction in the resistance of heat-exposed concrete to hammer blows. In the end, the microstructural studies were in overlap and in coordination with the results of the tests of this study.

کلیدواژه‌ها [English]

  • Geopolymer concrete
  • Blast furnace slag
  • nanosilica
  • Polyolefin fibers
  • Mechanical properties
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