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بهینهسازی طرح اختلاط بتن سیمانی حاوی درصدهای مختلفی از مواد بازیافتی و ضایعاتی گرانول لاستیک تایر و تراشه آسفالت بازیافتی (رپ) | ||
مهندسی زیر ساخت های حمل و نقل | ||
مقاله 3، دوره 11، شماره 1 - شماره پیاپی 41، فروردین 1404، صفحه 39-57 اصل مقاله (2.58 M) | ||
نوع مقاله: مقاله پژوهشی | ||
شناسه دیجیتال (DOI): 10.22075/jtie.2025.37190.1720 | ||
نویسنده | ||
دین محمد ایمانی* | ||
دانشکده مهندسی صنایع، دانشگاه علم و صنعت ایران، تهران، ایران | ||
تاریخ دریافت: 28 اسفند 1403، تاریخ بازنگری: 11 فروردین 1404، تاریخ پذیرش: 17 فروردین 1404 | ||
چکیده | ||
بتن یکی از مواد بسیار متداول جهت ساخت سازههای عمرانی میباشد و در سرتاسر جهان هر ساله مقادیر زیادی از این ماده مورد استفاده قرار میگیرد. استفاده از مواد بازیافتی و ضایعاتی در طرح اختلاط مخلوط بتنها یکی از روشهای مناسب و اقتصادی جهت تولید بتنهای سبز و با صرفه اقتصادی میباشد که میتواند مشکلات زیستمحیطی مربوط به امحا و انبارش ضایعات صنعتی را نیز کاهش دهد. گرانول لاستیک تایرهای بازیافتی و نیز تراشههای آسفالت بازیافتی و ضایعاتی است که در حجمهای زیاد قابل تولید است و جایگزینی این دو ماده با سنگدانههای طبیعی میتواند به تولید بتنهای سیمانی سبز و ارزان قیمت کمک نماید. با این وجود لازم است که بتن ساخته شده با این مواد بازیافتی به لحاظ استحکام و خواص مکانیکی نیز عملکرد مناسب داشته باشد. یکی از شاخصهای تعیین کننده عملکرد دوام و عمر سازههای بتنی میزان مقاومت در برابر ترکخوردگی مخلوط بتنی میباشد که با پارامتری به نام چقرمگی شکست اندازهگیری و سنجیده میشود. در این مقاله، به بررسی رفتار رشد ترک مخلوطهای بتن سیمانی مختلف حاوی درصدهای مختلفی از گرانول لاستیک و RAP (رپ) در طرح اختلاط آنها پرداخته میشود. بدین منظور، با استفاده از روش طراحی آزمایش تاگوچی، محدوده افزودنی گرانول از صفر درصد حجمی تا ۹ درصد حجمی و محدوده افزودنی رپ از صفر درصد تا ۴۰ درصد حجمی تغییر داده شده و ۱۶ ترکیب مختلف از بتن حاوی درصدهای مختلف سنگدانه گرانول و رپ مورد ارزیابی قرار گرفت. تستهای چقرمگی شکست با استفاده از نمونه دیسک ترکدار خمشی روی مخلوطهای مختلف بتنی انجام شد. نتایج تستها نشاندهنده تأثیر قابل ملاحظه نوع و درصد افزودنیها بر میزان مقاومت ترکخوردگی بتنهای سیمانی است. برای بررسی اثرگذاری رپ و گرانول بر مقدار شاخص چقرمگی شکست از آزمونهای آماری استفاده شد. در ابتدا از آنالیز واریانس (ANOVA) جهت بررسی تأثیرگذاری عامل استفاده شد و سپس این تأثیرگذاری با استفاده از نمودار پارتو نشان داده شد. بر اساس تحلیلهای آماری، هر دو افزودنی تأثیر معنادار و قابل توجهی بر رفتار شکست بتنهای سیمانی دارند؛ اما تأثیر افزودنی رپ از افزودنی گرانول لاستیک تایر بیشتر است. همچنین، بر اساس بهینهسازی انجام شده، طرح اختلاط حاوی 30 درصد رپ، 70 درصد سنگدانه آهکی و صفر درصد گرانول لاستیک، بیشترین مقدار چقرمگی شکست بتن را بهدست میدهد. | ||
کلیدواژهها | ||
بتن سیمانی؛ افزودنیهای مواد بازیافتی؛ رپ؛ گرانول لاستیک تایر؛ شاخص مقاومت ترک-خوردگی؛ طراحی آزمایش؛ طرح اختلاط بهینه؛ روشهای آماری | ||
عنوان مقاله [English] | ||
Optimization of Cementitious Concrete Mix Design Containing Various Percentages of Recycled Tire Rubber Granules and Reclaimed Asphalt Pavement (RAP) | ||
نویسندگان [English] | ||
Din Mohammad Imani | ||
Department of Industrial Engineering, Iran University of Science and Technology, Tehran, Iran | ||
چکیده [English] | ||
Concrete is one of the most widely used Mater. in civil engineering Struct., with large quantities being utilized globally each year. Incorporating recycled and waste Mater. into concrete mixtures is an effective and economical approach for producing green and cost-efficient concrete while also addressing environmental concerns related to industrial waste disposal and storage. Recycled tire rubber granules and reclaimed asphalt pavement (RAP) are two waste Mater. available in large quantities, and their substitution for natural aggregates can contribute to the development of eco-friendly and low-cost cementitious concrete. However, it is essential to ensure that concrete containing these recycled Mater. maintains adequate strength and mechanical properties. One of the key indicators of the durability and service life of concrete Struct. is their resistance to cracking, which is measured using the fracture toughness parameter. This study investigates the crack growth behavior of cementitious concrete mixtures incorporating different percentages of tire rubber granules and RAP in their mix designs. Using the Taguchi experimental design method, the rubber granule content was varied from 0% to 9% by volume, while the RAP content ranged from 0% to 40% by volume, resulting in 16 different concrete mixtures with varying proportions of rubber granules and RAP aggregates. Fracture toughness tests were conducted on pre-notched flexural disk specimens for different concrete mixtures. The results indicate a significant effect of the type and percentage of additives on the crack resistance of cementitious concrete. Statistical analyses were performed to assess the influence of RAP and rubber granules on the fracture toughness index. Initially, an analysis of variance (ANOVA) was conducted to evaluate the significance of the factors, followed by a Pareto chart to illustrate their effects. The statistical analysis revealed that both additives had a significant impact on the fracture behavior of cementitious concrete, with RAP having a greater effect than tire rubber granules. Additionally, based on the optimization results, the optimal mix design consisting of 30% RAP, 70% limestone aggregate, and 0% tire rubber granules exhibited the highest fracture toughness. | ||
کلیدواژهها [English] | ||
Cementitious concrete, Recycled additives, RAP, Tire rubber granules, Crack resistance index, Experimental design, Optimal mix design, Statistical methods | ||
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