مطالعۀ آزمایشگاهی خواص مکانیکی ملات های ژئوپلیمری حاوی سرباره، پودر کائولن و پلیمر

مهندسی عمران فردوسی

مقاله 8، دوره 37، شماره 2 - شماره پیاپی 46، مرداد 1403، صفحه 25-50   

نوع مقاله: مقاله پژوهشی

شناسه دیجیتال (DOI): 10.22067/jfcei.2024.79313.1185

نویسندگان

سید حسین قاسم زاده موسوی نژاد^* ؛ آرین درویشعلی نژاد

گروه مهندسی عمران، دانشکدۀ فنی، دانشگاه گیلان، رشت، ایران

چکیده

با توجه به میزان مصرف بالای ملات و بتن در سازه ها و نیاز روز افزون به تولید سیمان، توجه به اثرات مخرب زیست محیطی این ماده ضروری به نظر می رسد. این پژوهش قصد دارد تأثیر پودر سرامیک کائولن، سربارۀ کورۀ آهنگدازی و پلیمر استایرن بوتادین رابر را بر روی خواص ‏مکانیکی بتن ژئوپلیمری بررسی کند. در این تحقیق آزمایشگاهی از پودر کائولن و سرباره با درصدهای مختلف و پلیمر استفاده شده است. به منظور دستیابی به اهداف، نمونه های 12 طرح اختلاط تحت ‏آزمایش های مختلف نظیر مقاومت فشاری، خمشی، کششی، مدول الاستیسیته، زمان گیرش بتن (سوزن ویکات) و بررسی ریزساختار میکروسکوپ الکترونی روبشی قرار گرفتند. استفاده از پلیمر در آزمایش مقاومت فشاری 7 و 28 روزه در نمونه طرح BS8 نسبت به طرح شاهد S4 به ترتیب باعث بهبود 15% و 24% مقاومت نمونه ها شد. در آزمایش مقاومت کششی نمونه طرح اختلاط SC50-4 (2.79 Mpa) نسبت به نمونه طرح شاهد S4 (2.63 Mpa) باعث بهبود 6% مقاومت نمونه شد. در آزمایش مقاومت خمشی بین نمونه طرح شاهد S4 نسبت به نمونه طرح BS8 تفاوت معناداری مشاهده نشد. با آزمایش ریزساختار در نمونه های حاوی 75% پودر کائولن نسبت به نمونه های حاوی 50% پودر کائولن، به علت آگلومره شدن نانو ذرات، افت خواص مکانیکی در آنها مشاهده شد که به دلیل تجمع نانو ذرات در این درصد وزنی است.

کلیدواژه‌ها

ملات ژئوپلیمر؛ سرباره؛ کائولن؛ مقاومت فشاری؛ خواص مکانیکی

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