بررسی مقاومت ضربه‌ای، ریزساختاری و کاهش وزن در بتن ژئوپلیمر پوزولانی حاوی الیاف، تحت حرارت بالا

منصورقناعی, محمدحسین; بیک لریان, مرتضی; مردوخ پور, علیرضا

بررسی مقاومت ضربه‌ای، ریزساختاری و کاهش وزن در بتن ژئوپلیمر پوزولانی حاوی الیاف، تحت حرارت بالا

نوع مقاله : مقاله پژوهشی

نویسندگان

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

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

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

چکیده

امروزه ساخت سازههایی با اهمیت خیلی زیاد (نظیر سازههای نظامی، تاسیسات هستهای، بیمارستانها و تأسیسات زیربنایی)، با مقاومت بالا در برابر بارهای ضربهای و حرارت زیاد، در حوزه پدافند غیرعامل از اهمیت ویژهای برخوردار است. در این راستا، تولید بتن پر مقاومت و دوستدار طبیعت به‌عنوان مصالح اصلی به‌کار رفته در این نوع از سازهها نقش مهمی را ایفاء میکند. در این مقاله به بررسی آزمایشگاهی خصوصیات بتن ژئوپلیمر سربارهای حاوی0 الی 8 درصد نانوسیلیس و 1 الی 2 درصد الیاف پلیاولفین پرداخته شده است. نمونههای بتنی ساخته شده در سن عملآوری 90 روزه و در دمای 25 و 500 درجه سلسیوس تحت آزمون ضربه وزنهافتان، کاهش وزن، تصویربرداری میکروسکوپ الکترونی روبشی (SEM) و طیفسنجی پراش اشعهایکس (XRD) قرار گرفتند، آنالیز طیفسنجی فلورسانس اشعهایکس (XRF) نیز در دمای 25 درجه سلسیوس و در سن 7 روز عملآوری بر روی نمونههای بتنی انجام گرفت. نتایج حاصله حاکی از تضعیف ریزساختار بتن در معرض حرارت بالا است، بهبود نتایج حاصل از آزمونها در بتن ژئوپلیمری نسبت به بتن معمولی مشهود است. بهترین و ضعیفترین عملکرد در آزمون کاهش وزن نمونهها متعلق به بتن ژئوپلیمری حاوی 8 درصد نانوسیلیس و بتن ژئوپلیمری حاوی 8 درصد نانوسیلیس و 2 درصد الیاف، به ترتیب به میزان 061/0 و 12/0 درصد افت وزن نمونه میباشد. بهترین عملکرد در میزان جذب انرژی ضربه وزنهافتان در دمای 25 و 500 درجه سلسیوس متعلق به بتن ژئوپلیمری (حاوی 8 درصد نانوسیلیس و 2 درصد الیاف) به ترتیب به میزان 25/2928 و 44/773 ژول است. بیشترین و کمترین میزان افت در انرژی جذبشده نمونههای بتنی تحت دمای500 درجه سلسیوس نسبت به دمای 25 درجه سلسیوس، متعلق به بتن معمولی و بتن ژئوپلیمری (حاوی 8 درصد نانوسیلیس) به ترتیب به میزان 33/83 و 33/53 درصد است.

کلیدواژه‌ها

20.1001.1.20086849.1401.13.3.2.9

عنوان مقاله [English]

Investigation of the Impact Resistance, Microstructure and Weight Loss in Fibrous Pozzolanic Concrete Containing Fibers, Under High Temperatures

نویسندگان [English]

Mohammadhossein Mansourghanaei ¹
Morteza Biklaryan ²
Alireza Mardookhpour ³

¹ 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]

Today, the construction of highly critical structures (such as military and nuclear structures, hospitals and infrastructures), with high resistance to impact loads and high temperatures, is of particular importance in the field of passive defense. In this regard, the production of high-strength and nature-friendly concrete as the main material used in these types of structures plays a significant role. In this paper, the laboratory properties of the slag geopolymer concrete containing 0 to 8% nanosilica and 1 to 2% polyalphin fibers have been investigated. The concrete samples made at 90 days of curing age at 25 and 500 °C Celsius underwent weightlifting, weight loss, scanning electron microscopy (SEM), X-ray diffraction (XRD) spectroscopy, and X-ray fluorescence (XRF) at 25 °C. At the age of seven days, the processing was performed on the concrete samples. The results indicate the weakening of the microstructure of concrete exposed to high temperatures. Also, the improvement of test results in the geopolymer concrete compared to ordinary concrete is evident. The best and worst performance in the weight loss test of the samples belonged to the geopolymer concrete containing 8% nanosilica and the geopolymer concrete containing 8% nanosilica and 2% fibers, by 0.061% and 0.12% weight loss of the sample, respectively. The best performance in the energy absorption of falling weight at 25 and 500 degrees Celsius belongs to the geopolymer concrete (containing 8% nanosilica and 2% fiber) at 2928.25 and 773.44 joules, respectively. The highest and lowest energy loss of concrete samples at 500 °C compared to 25 °C belong to the ordinary concrete and the geopolymer concrete (containing 8% nanosilica) by 83.33% and 53.33%, respectively.

کلیدواژه‌ها [English]

Geopolymer Concrete
Blast Furnace Slag
Nano Silica
Polyolefin Fibers
Weight Loss

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