بررسی ریزساختار بتن ژئوپلیمری در سازه‌ها، با رویکرد مدیریت بحران

نوع مقاله : مقاله پژوهشی

نویسنده

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

چکیده

مدیریت بحران از شاخصه‌های ایجاد امنیت ملی در کشور است. به‌منظور کاهش آسیب‌پذیری مراکز حیاتی و زیرساخت‌های عمرانی کشور در برابر بروز بحران‌های مختلف، بهبود خواص مکانیکی و دوام بتن مصرفی در سازه-های بتن‌آرمه این‌گونه از مراکز، راه‌کاری موثر و کاربردی خواهد بود. بهبود بخش ریزساختار بتن کمک شایانی به افزایش استحکام بتن در برابر بروز عوامل مختلف تخریب بتن دارد. در این پژوهش آزمایشگاهی، یک طرح مخلوط از بتن معمولی حاوی سیمان پرتلند با عیار500 کیلوگرم بر متر مکعب و یک طرح مخلوط از بتن ژئوپلیمری بر پایه سرباره کوره آهنگدازی ساخته شد. به‌منظور بررسی ریزساختاری بتن، آنالیز تصاویر میکروسکوپ الکترونی روبشی (SEM) در سن عمل‌آوری 90 روزه بر روی نمونه‌های بتنی انجام گرفت، در ادامه به‌منظور بررسی و صحت‌سنجی نتایج SEM، آزمون غیرمخرب نفوذپذیری آب و آزمون مخرب مقاومت فشاری در سن عمل‌آوری 7، 28 و 90 روزه در بتن انجام گردید. نتایج حاصل از آنالیز SEM حاکی از برتری تراکم در بخش ریزساختار بتن ژئوپلیمری به-واسطه تولید حجم بالایی از ژل‌های هیدراته نسبت به بتن معمولی است. نتایج حاصل از آزمون مقاومت فشاری و نفوذپذیری آب، نشان از تکمیل بخش اعظمی از فرایند ژئوبسپارش در سن عمل‌آوری 90 روزه در بتن است، در این راستا بهبود نتایج در سن عمل‌آوری 90 روز نسبت به سن عمل‌آوری 7 روزه در بتن معمولی و بتن ژئوپلیمری در آزمون مقاومت فشاری به‌ترتیب به‌میزان 79/48 و 93/10 درصد کسب گردید، در آزمون نفوذپذیری، این برتری به-ترتیب به‌میزان 44/19 و 81/14 درصد حاصل گردید.

کلیدواژه‌ها

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مطالعات مدیریت بحران
دوره 15، شماره 2
فصلنامه تابستان
مرداد 1402
صفحه 149-169

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سابقه مقاله

  • تاریخ دریافت: 29 خرداد 1402
  • تاریخ بازنگری: 21 تیر 1402
  • تاریخ پذیرش: 21 تیر 1402

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