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بررسیآزمایشگاهیمشخصات و مقاومت بتن پوزولانی معدنی محلّی در برابر آتش و ارزیابی توانایی آن درکاهش انتشار گاز گلخانهای CO2 | ||
نشریه مهندسی عمران و محیط زیست دانشگاه تبریز | ||
مقاله 18، دوره 54، شماره 114، خرداد 1403، صفحه 211-224 اصل مقاله (771.27 K) | ||
نوع مقاله: یادداشت پژوهشی | ||
شناسه دیجیتال (DOI): 10.22034/ceej.2023.30485.2146 | ||
نویسندگان | ||
مهدی رفتاری* 1؛ رحمت مدندوست2؛ رضا محجوب1؛ مجتبی رنگرزیان3 | ||
1گروه مهندسی عمران، واحد خرمآباد، دانشگاه آزاد اسلامی، خرمآباد | ||
2استاد گروه مهندسی عمران، دانشکده فنی، دانشگاه گیلان، رشت و استاد مدعو گروه مهندسی عمران، واحد خرمآباد، دانشگاه آزاد اسلامی، خرمآباد | ||
3گروه مهندسی عمران، واحد خرمآباد، دانشگاه آزاد اسلامی، خرمآباد | ||
چکیده | ||
یافتن راهی جهت کاهش تولید و مصرف سیمان در بتن به عنوان پرمصرفترین مصالح ساختمانی، که درنتیجه آن از انتشارگاز گلخانهای CO2 کاسته شود، اولویت دارد. در این مقاله، یک پوزولان طبیعی از ایران با خواص فیزیکی و شیمیایی مناسب برای جایگزینی بخشی از سیمان در بتن، معرفی و خواص مهندسی آن بررسی و توانایی آن در کاهش مقدار انتشار CO2 مورد ارزیابی قرار گرفت. در آزمایشات، از الیاف فولادی و پلیپروپیلن به صورت جداگانه و هیبرید با پوزولان معدنی جدید استفاده گردید. با توجّه به بهینه سازیهای قبلی، پوزولان معدنی با کسر وزنی 15 درصد معوض سیمان، در بتن استفاده شد. آزمایشات نشان داد نمونههای بتنی حاوی پوزولان معدنی محلّی و الیاف فولادی، از مقاومت فشاری بیشتری برخوردار بودند. نمونههای بتن پوزولانی حاوی ترکیبی از الیاف فولادی و پلیپروپیلن عملکرد بهتری در مقاومت خمشی داشتند. بررسی مقاومت نمونه ها پس از قرارگیری در دمای °C600 صورت پذیرفت. نمونه های حاوی الیاف فولادی مقاومت فشاری بهتری از خود نشان دادند. بررسیها ثابت کرد، افزودن 15 درصد وزنی پوزولان معدنی محلی معوض سیمان در بتن میتواند 20/15 درصد انتشار گاز گلخانه ای CO2 را کاهش دهد. مطالعات بر روی نمونه های حاوی پوزولان معدنی محلی نشان داد که این پوزولان با ایجاد واکنش مطلوب پوزولانی با پرتلندیت، از افزایش اندازه مقدار پرتلندیت در نزدیکی سنگدانه ها جلوگیری کرده و بهاین ترتیب ناحیه انتقال مرزی (ITZ) (Interfacial Transition Zone) را تقویت کرد و پیوند بین کل و ماتریس را بهبود می بخشد. کاهش انتشار آلایندگی با مدنظر قراردادن مقیاس تولید و مصرف سیمان در صنعت ساختمان، در حفظ محیط زیست اثرگذار می باشد، به گونه ای که پوزولان معدنی مورد مطالعه، ضمن بهبود مشخصات مهندسی بتن، مصرف سیمان را تا حدّ زیادی کاهش می دهد و کارا در حفاظت از محیط زیست و ساخت و تولید بتن سبز است. | ||
کلیدواژهها | ||
بتن الیافی پوزولانی؛ مشخصات مکانیکی بتن؛ اثر آتش؛ گاز گلخانهای؛ پتانسیل گرمایش جهانی (GWP)؛ بتن سبز | ||
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مراجع | ||
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