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مطالعه آزمایشگاهی خصوصیات مکانیکی و ریزساختار ملات سیمانی حاوی پودرهای شیشه، پوسته تخم مرغ، آهن و لاستیک تحت شرایط محیطی اسیدی، خنثی و بازی | ||
| نشریه مهندسی عمران امیرکبیر | ||
| مقاله 2، دوره 55، شماره 12، 1402، صفحه 2365-2404 اصل مقاله (3.65 M) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22060/ceej.2023.21291.7677 | ||
| نویسندگان | ||
| جواد محسنی پور اصل؛ مجید قلهکی* ؛ محمدکاظم شربتدار | ||
| دانشکده عمران، دانشگاه سمنان، سمنان، ایران | ||
| چکیده | ||
| در این مقاله به بررسی خصوصیات مکانیکی و ریزساختار ملات سیمانی حاوی ضایعات بازیافتی مختلف تحت شرایط محیطی اسیدی، خنثی و بازی پرداخته شده است. ضایعات بازیافتی شامل پودرهای شیشه، پوسته تخم مرغ، آهن و لاستیک در مقادیر 7، 14 و 21 درصد وزنی جایگزین سیمان شدند. پس از انجام آزمایش روانی (مینیاسلامپ)، کلیه نمونه ها در سنین 7، 28 و 90 روزه تحت آزمایشات مقاومت فشاری، کششی و خمشی و جذب آب و همچنین آزمایشات ریزساختار شامل آزمایش میکروسکوپ الکترونیکی(SEM) و آزمایش پراش اشعه ایکس (XRD) قرار گرفتند. محیط اسیدی با PH=2.5 و محیط بازی با PH=12.5 و محیط خنثی (آب معمولی) با PH=7 برای انجام عمل آوری نمونهها در نظر گرفته شدند. نتایج حاکی از آن است که بیشترین میزان افزایش مقاومت فشاری، کششی و خمشی نسبت به نمونه مرجع، به ترتیب برابر 33% در محیط اسیدی، 90% در محیط خنثی و اسیدی و 67% در محیط اسیدی ملات سیمانی می باشد و حضور ضایعات بازیافتی کمک شایانی در بهبود مشخصات مکانیکی در شرایط عمل آوری اسیدی می کند. همچنین افزودن پودر لاستیک به ترکیب ملات سیمانی سبب کاهش مقاومت فشاری، کششی و خمشی تا 6/11، 2 و2/6 برابر نسبت به نمونه مرجع شده است که استفاده از آن در پروژه های عمرانی، به لحاظ فنی توصیه نمی شود. با استفاده از پودرهای شیشه، آهن و پودر پوسته تخم در مقادیر 7 درصد، می توان میزان جذب آب نمونه ها را در سنین 7، 28 و 90 روزه تا 7/11، 13/22 و9/29 درصد نسبت به نمونه مرجع کاهش داد. نتایج آزمایشات ریزساختار نیز نشان از کاهش 3 برابری عرض ترکها و حفرات موجود در نمونه های حاوی پودرهای شیشه، آهن و پوسته تخم مرغ داشته و پیوند خمیر سیمان و افزودنی ها نیز قویتر شده است. | ||
| کلیدواژهها | ||
| ملات سیمانی؛ ضایعات بازیافتی؛ خصوصیات مکانیکی؛ میکروسکوپ الکترونیکی؛ پراش اشعه ایکس؛ محیط های اسیدی و بازی | ||
| موضوعات | ||
| تکنولوژی بتن؛ مواد و مصالح | ||
| عنوان مقاله [English] | ||
| An Experimental Investigation into the Mechanical Performance and Microstructure of Cementitious Mortars Containing Recycled Waste Materials Subjected to Various Environments | ||
| نویسندگان [English] | ||
| javad mohseni pour asl؛ majid gholhaki؛ Mohammad Kazem Sharbatdar | ||
| MSc, Semnan University, Semnan, Iran. | ||
| چکیده [English] | ||
| This paper deals with an experimental investigation into the mechanical performance and microstructure characteristics of cementitious mortars containing recycled waste materials subjected to acidic, neutral, and alkaline environments. The recycled waste materials include glass, eggshell, iron, and rubber powder in various amounts, namely 7, 14, and 21% by volume, as the replacement for ordinary Portland cement (OPC). In this respect, to examine the mechanical performance of the specimens, the compressive, tensile, and bending strength tests as well as water absorption tests were carried out at the ages of 7, 28, and 90 days. Moreover, to study the microstructure of the specimens, scanning electron microscopy (SEM) and x-ray diffraction (XRD) tests were conducted accordingly. For curing the specimens, three different environments with PH values of 2.5, 12.5, and 7 representing the acidic, alkaline, and neutral environments, were taken into account. Promisingly, it was observed that the inclusion of recycled waste materials significantly enhanced the mechanical properties of the mortar when exposed to acidic curing conditions. Lastly, the results derived from the microstructure tests revealed that as a result of replacing cement with glass, iron, and eggshell powders, the width of cracks and volume of the pores decreased by three times, and importantly, the bonding between the cement paste and additives was strengthened. | ||
| کلیدواژهها [English] | ||
| Cementitious Mortar, recycled waste materials, mechanical properties, Scanning Electron Microscopy (SEM), X-Ray Diffraction (XRD), acidic and alkaline environments | ||
| مراجع | ||
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