مطالعه آزمایشگاهی تاثیر افزودن الیاف و مصالح فرآوری شده معدنی بر روی بتن ژئوپلیمری

نوع مقاله : مقاله پژوهشی

نویسندگان

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

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

3 گروه مهندسی عمران، واحد لاهیجان، دانشگاه آزاد اسلامی، لاهیجان، ایران

چکیده

بتن ژئوپلیمری در راستای رفع معایب (نظیر استحکام پایین و مضرات محیط زیستی) ناشی از مصرف بتن معمولی در سازه‌ها مطرح گردید. در ساخت این نوع از بتن، مواد ژئوپلیمری فرآوری شده حاصل از منابع معدنی مانند سرباره و نانوسیلیس جایگزین سیمان می شود و بتن مستحکم ژئوپلیمری را تولید می کند. در این پژوهش آزمایشگاهی به ساخت یک طرح اختلاط از بتن کنترل حاوی سیمان پرتلند پرداخته شد. سپس بتن ژئوپلیمری در سه طرح تولید گردید. طرح اول، حاوی 100 درصد سرباره کوره آهنگدازی و طرح دوم و سوم حاوی 92 درصد سرباره کوره آهنگدازی و 8 درصد نانوسیلیس، به ترتیب حاوی 1 و 2 درصد الیاف پلی الفین (در مجموع 4 طرح اختلاط) است. در ادامه، آزمون های مدول الاستیسیته و مقاومت کششی در سن عمل آوری 7 و 28 روزه در دمای اتاق، بر روی نمونه های بتنی انجام گرفت. آزمون SEM در سن عمل آوری 90 روزه، بمنظور صحت سنجی با سایر نتایج، بر روی نمونه‌های بتنی انجام گرفت. نتایج حاکی از این موضوع است که افزایش سن عمل آوری در بتن، موجب بهبود نتایج شد. در آزمون مدول الاستیسیته و مقاومت کششی، افزودن الیاف به بتن ژئوپلیمری در سن 28 روزه، به ترتیب موجب بهبود 19/21 و 07/24 درصدی نتایج در طرح4 (2 درصد الیاف) نسبت به طرح2 (فاقد الیاف) شد. افزایش الیاف موجب بهبود نتایج آزمون‌های مقاومت کششی و مدول الاستیسیته بتن ژئوپلیمری در مقایسه با بتن کنترل شد. نتایج آزمون SEM در همپوشانی با نتایج سایر آزمون‌ها قرار گرفت.

کلیدواژه‌ها

عنوان مقاله [English]

Experimental study of the effect of adding fibers and mineral processed materials on geopolymer concrete

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 Department of Civil Engineering, Lahijan Branch, Islamic Azad University, Lahijan, Iran
چکیده [English]

Geopolymer concrete was proposed in order to eliminate the disadvantages (such as low strength and environmental damage) caused by the use of ordinary concrete in structures. In making this type of concrete, processed geopolymer materials from mineral sources such as slag and nanosilica replace cement and produce strong geopolymer concrete. In this laboratory research, a mixing design was made of control concrete containing Portland cement. Then geopolymer concrete was produced in three designs. The first design contains 100% of the slag of the composing furnace and the second and third designs contain 92% of the slag of the composing furnace and 8% of nanosilica, respectively, containing 1 and 2% of polyolefin fibers (4 mixing designs in total). Then, modulus of elasticity and tensile strength tests at 7 and 28 days of processing time at room temperature were performed on concrete samples. SEM test was performed on concrete samples at 90 days of age for validation with other results. The results indicate that increasing the curing age of concrete improved the results. In the modulus of elasticity and tensile strength test, the addition of fibers to geopolymer concrete at the age of 28 days, improved the results in Figure 19 (2% of fibers) compared to Figure 2 (no fibers) by 21.19 and 24.07%, respectively. Increasing the fibers improved the results of tensile strength tests and modulus of elasticity of geopolymer concrete compared to control concrete. The results of the SEM test overlapped with the results of other tests.

کلیدواژه‌ها [English]

  • Geopolymer concrete
  • Blast furnace slag
  • Nano silica
  • Polyolefin fibers
  • Tensile strength

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نشریه انجمن زمین شناسی مهندسی ایران
دوره 15، شماره 3
آذر 1401
صفحه 65-74

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سابقه مقاله

  • تاریخ دریافت: 22 آبان 1400
  • تاریخ بازنگری: 24 اردیبهشت 1401
  • تاریخ پذیرش: 09 شهریور 1401

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