ارزیابی مقاومت ضربه ای بتن ژئوپلیمر سرباره ای حاوی نانوسیلیس و الیاف پلی الفین تحت حرارت

نوع مقاله : مقاله کامل پژوهشی

نویسندگان

1 گروه مهندسی عمران، واحد چالوس، دانشگاه آزاد اسلامی، چالوس

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

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

چکیده

امروزه به ­منظور کاهش اثرات منفی محیط زیستی ناشی از به­ کارگیری سیمان در بتن، استفاده از نانو ذراتی که حاوی مواد آلومینوسیلیکاتی (Aluminosilicate) باشند به­ عنوان جایگزین بخشی از سیمان دارای اهمیت فراوان می­ باشد. در این مطالعه به بررسی آزمایشگاهی مقاومت بتن ژئوپلیمر (Geopolymer Concrete) سرباره­ای در برابر ضربه ­های چکش افتان در دمای اتاق و پس از در معرض قرار گرفتن حرارت 300 و 600 درجه سلسیوس در دوره عمل­ آوری 90 روزه پرداخته شده است، در این راستا سه طرح اختلاط از بتن ژئوپلیمر سرباره­ای حاوی 0 تا 8 درصد نانوسیلیس (Nanosilica) ساخته شد و پس از انجام آزمایش مقاومت ضربه ­ای و انتخاب طرح بهینه به ­لحاظ مقاومت، به­ منظور افزایش خواص مقاومتی در طرح بهینه، دو طرح حاوی 1 و 2 درصد از الیاف پلی­الفین (Polyolefin Fibers) ساخته شد و مجدد نمونه ­ها مورد آزمایش قرار گرفتند، نتایج حاصل از پنج طرح اختلاط با یک طرح اختلاط از بتن کنترل حاوی سیمان پرتلند مورد مقایسه و ارزیابی قرار گرفت. در ادامه جهت مقایسه و بررسی ریزساختاری بتن ژئوپلیمری و بتن کنترل از آنالیز SEM و XRD استفاده گردید. نتایج حاصله حاکی از مقاومت بالای نمونه ­های بتن ژئوپلیمر حاوی الیاف پلی­الفین در برابر ضربات چکش افتان بود و بررسی­ های ریزساختاری در هم ­پوشانی با نتایج حاصل از ارزیابی مقاومت ضربه ­ای چکش افتان در بتن قرار داشت.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Evaluation of Impact Strength of Heated Slag Geopolymer Concrete

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]

     In this study, 6 mixing designs including 1 design of control concrete containing Portland cement, 3 designs of geopolymer concrete containing 0 to 8% nanosilica and 2 designs of slag geopolymer concrete containing nanosilica and 1 and 2% of polyolefin fibers were made (Mansourghanaei et. al., 2022; Mansourghanaei et. al., 2022; Mansourghanaei et al., 2022). In line with the prepared mixing plan, 54 concrete specimens were made for impact test (each test averaged the results of 3 concrete specimens) and 24 concrete specimens were made for compressive strength test (each test averaged the results of 4 concrete specimens) which at the age of 90 Fasts were tested and evaluated. It should be noted that for SEM and XRD tests, shredded tests were used. Concrete compressive strength test was performed at room temperature and impact weight test at room temperature and temperature of 300 and 600℃. In the drop weight test, parameters such as impact energy due to initial cracking and failure, adsorbed energy and flexibility index of concrete samples were calculated and evaluated. In order to study the microstructure and verification of the results of hammer impact test, XRD and SEM tests were used on concrete samples.

کلیدواژه‌ها [English]

  • Geopolymer concrete
  • Blast furnace slag
  • Nanosilica
  • Polyolefin fibers
  • Drop weight hammer

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نشریه مهندسی عمران و محیط زیست دانشگاه تبریز
دوره 53.1، شماره 110 - شماره پیاپی 110
بهار 1402
خرداد 1402
صفحه 87-101

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