بررسی مقاومت فشاری و کاهش وزن در بتن قلیافعال حافظ محیط زیست، تحت حرارت بالا
محورهای موضوعی : اقتصاد محیط زیست
محمدحسین منصورقناعی
1
(دانشجوی دکتری عمران سازه، گروه مهندسی عمران، واحد چالوس، دانشگاه آزاد اسلامی، چالوس، ایران )
کلید واژه: بتن معمولی, بتن قلیافعال, مقاومت فشاری, کاهش وزن, میکروسکوپ الکترونیک روبشی.,
چکیده مقاله :
حفظ محیط زیست نقش موثری را در سلامت انسان ها ایفا می کند. در این راستا در دهه های اخیر، بتن قلیافعال به منظور برتری خواص مکانیکی و دوام و رفع معایب محیط زیستی (ناشی از تولید گاز سمی دی اکسید کربن) در بتن معمولی، مورد توجه محققین رشته مهندسی عمران قرار گرفت. در این پژوهش آزمایشگاهی، یک طرح اختلاط از بتن معمولی حاوی سیمان پرتلند با عیار 500 کیلوگرم بر متر مکعب و یک طرح اختلاط از بتن قلیافعال بر پایه سرباره کوره آهنگدازی ساخته شد. به منظور بررسی خواص مکانیکی و دوام، آزمون های مقاومت فشاری و کاهش وزن بتن تحت دمای 21 و 600 درجه سلسیوس در سن عمل آوری 90 روزه در بتن انجام گرفت. اعمال حرارت بالا در نمونه های بتنی موجب افت نتایج در آزمون مقاومت فشاری در بتن معمولی و بتن قلیافعال به ترتیب به میزان 31/42 و 9/14 درصد گردید و در آزمون کاهش وزن به ترتیب به میزان 0067/0 و 0064/0 درصد افت وزن در بتن معمولی و بتن قلیافعال کسب شد. بتن قلیافعال در آزمون مقاومت فشاری تحت دمای 21 و 600 درجه سلسیوس، به میزان 41/11 و 35/64 درصد برتری را نسبت به بتن معمولی از خود نشان داد. نتایج حاصل از آزمون تصویر برداری میکروسکوپ الکترونیک روبشی، در هماهنگی و همپوشانی با نتایج سایر آزمون ها در این پژوهش قرار گرفت.
Environmental protection plays an effective role in human health. In this regard, in recent decades, high-strength concrete in order to excel mechanical properties and durability and eliminate environmental disadvantages (due to the production of toxic carbon dioxide) in ordinary concrete, has been considered by civil engineering researchers. In this laboratory study, a mixing plan was made of ordinary concrete containing Portland cement with a grade of 500 kg/m3 and a mixing plan was made of alkaline concrete based on slag from a composing furnace. In order to evaluate the mechanical properties and durability, compressive strength and weight reduction tests of concrete were performed at 21 and 600 °C at a 90-day curing age in concrete. Applying high heat in concrete samples caused a decrease in the results of compressive strength test in ordinary concrete and reinforced concrete by 42.31% and 14.9%, respectively, and in weight loss test by 0.0067 and 0.0064%, respectively. Weight loss was achieved in ordinary concrete and alkaline concrete. Alkaline reinforced concrete in the compressive strength test at 21 and 600 degrees Celsius, showed an advantage of 11.41 and 64.35 percent compared to ordinary concrete. The results of scanning electron microscopy imaging test were in coordination with the results of other tests in this study.
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