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بررسی فرآیند اندرکنش خاکستر بادی و خاکهای رسی با دامنه خمیری زیاد از دیدگاه ریزساختاری | ||
نشریه مهندسی عمران و محیط زیست دانشگاه تبریز | ||
مقاله 1، دوره 49.4، شماره 97، اسفند 1398، صفحه 1-14 اصل مقاله (1.09 M) | ||
نوع مقاله: مقاله کامل پژوهشی | ||
شناسه دیجیتال (DOI): 10.22034/ceej.2020.9482 | ||
نویسندگان | ||
وحید رضا اوحدی* 1؛ مرتضی دیرانلو2؛ پوریا رسولی2 | ||
1دانشکده مهندسی، دانشگاه بوعلی سینا، همدان | ||
2گروه عمران، دانشکده مهندسی، دانشگاه بوعلی سینا، همدان | ||
چکیده | ||
خاکستر بادی پسماند سوزاندن زغال سنگ در نیروگاههای برقی حرارتی است. تولید زیاد این پسماند معضلات زیستمحیطی برای دفن ایمن آن را بههمراه داشته است. خاکستر بادی به دلیل داشتن مقادیر زیادی سیلیسیوم و آلومینیوم دارای خواص پوزولانی است که استفاده از آن را در مباحث بتن، تثبیت خاکها و تثبیت و جامدسازی آلایندهها امکانپذیر میکند. با وجود انجام تحقیقات متعدد، همچنان نوع عملکرد فیزیکی و یا شیمیایی خاکستر بادی در ترکیب با خاکهای رسی بخوبی مشخص نمیباشد. بر این اساس هدف این تحقیق بررسی نوع عملکرد خاکستر بادی کلاس F در رس متورم شونده بنتونیت است. خصوصیات مکانیکی ترکیبات بنتونیت و خاکستر بادی تا 30% وزنی بنتونیت، با استفاده از آزمایشهای حدود اتربرگ، تراکم، و آزمایش مقاومت فشاری محدود نشده ارزیابی شده است. همچنین از مطالعات ریزساختاری هیدرومتری، XRD و مقادیر کاتیونهای استخراج شده خاکستر بادی تحت شرایط محیطی اسیدی تا بازی، برای بررسی رفتار شیمیایی خاکستر بادی استفاده شده است. نتایج نشان داده است که مقادیر انحلال کاتیونهای Si و Al خاکستر بادی تابع pH است و در pH حدود 9 با استفاده از آزمایش استخراج به ترتیب 4/0 و cmol/kg-soil 01/0 به دست آمده است. به دلیل غلظت کم انحلال این کاتیونها امکان شکلگیری واکنش پوزولانی وجود ندارد. همچنین مقاومت فشاری محدود نشده نمونه بنتونیت-30% خاکستر بادی با افزایش زمان مراقبت از 7 تا 90 روز با اندکی افزایش به ترتیب از 444 به kPa 515 رسیده است. نتایج بررسی XRD نمونهها نشان میدهد که با افزایش زمان مراقبت نمونه بنتونیت -30% خاکستر بادی، هیچگونه محصولات پوزولانی تشکیل نشده است. | ||
کلیدواژهها | ||
خاکستر بادی؛ بنتونیت؛ UCS؛ pH؛ اشعه ایکس | ||
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