پژوهشنامه حمل و نقل

پژوهشنامه حمل و نقل

بررسی خواص مکانیکی مخلوط‌های آسفالتی گرم با قیر حاوی خاکستر ساقه جو

نوع مقاله : مقاله پژوهشی

نویسندگان
محدثه ابراهیمی 1
مهیار عربانی 2
محمد یوسف پور طالقانی 1
1 دانش آموخته کارشناسی ارشد، گروه مهندسی عمران، دانشکده فنی، دانشگاه گیلان، گیلان، ایران
2 استاد، گروه مهندسی عمران، دانشکده فنی، دانشگاه گیلان، گیلان، ایران
10.22034/tri.2024.430557.3215
چکیده
در سالیان اخیر تحقیقات زیادی به منظور استفاده از مواد تجدیدپذیر زیستی؛ مانند پسماندهای کشاورزی به‌عنوان اصلاح‌کننده قیر در روسازی های آسفالتی انجام شده است. سوزاندن زیست توده ها برای تأمین انرژی یا برای حذف آن‌ها، همواره با تولید پسماندی به شکل خاکستر همراه است. دفع خاکستر می‌تواند به‌مرورزمان به یک بحران زیست‌محیطی تبدیل شود. این مواد زیستی دارای خواص عالی برای اصلاح قیر، هزینه کم و سازگار با محیط‌زیست هستند. هدف از این مطالعه بررسی اثر افزودن خاکستر ساقه جو (BSA) بر خواص مکانیکی مخلوط آسفالتی است. قیر با 5%، 10%، 15% و 20% اصلاح‌کننده مخلوط شد. پس از بررسی خواص شیمیایی و مورفولوژی قیر و خاکستر، آزمایش‌های فیزیکی قیر، آزمایش بازگشت خزشی در چند سطح تنش (MSCR)، مقاومت مارشال، بارمحوری مکرر در دمای بالا و آزمایش خمش نیم‌دایره‌ای در دمای میانی و دمای پایین انجام گرفت. نتایج نشان داد که BSA درجه نفوذ و شکل پذیری را کاهش و نقطه نرمی و سفتی قیر را افزایش می‌دهد. همچنین نتایج MSCR نشان داد قیر اصلاح شده تغییر شکل های دائمی کمتری را در دمای بالا تجربه می کند. نتایج آزمایش بار محوری مکرر نیز نشان داد BSAعملکرد دمای بالا مخلوط آسفالتی را بهبود بخشیده و آن را برای استفاده در مناطق گرمسیر مناسب تر می سازد. نتایج آزمایش خمش نیم دایره ای نشان داد که خاکستر ساقه جو اثر کاهنده بر مقاومت خستگی مخلوط آسفالتی در دمای میانی و ترک‌خوردگی دمای پایین دارد.
کلیدواژه‌ها
خواص مکانیکی‌
خاکستر ساقه جو
قیر اصلاح شده
مخلوط آسفالتی گرم

موضوعات

عنوان مقاله English

Investigation of Mechanical Properties of Asphalt Mixtures Containing Barley Stalk Ash

نویسندگان English

Mohadeseh Ebrahimi 1
Mahyar Arabani 2
Mohammad Yousefpour Taleghani 1
1 M.Sc., Grad., Department of Civil Engineering, University of Guilan, Rasht, Iran.
2 Professor‌, Department of Civil Engineering, University of Guilan, Rasht, Iran.
چکیده English

In recent years, much research has been conducted on using bio-renewable materials. For instance, agricultural residues are used as a bitumen modifier in asphalt pavements. Burning biomass to provide energy or to remove it is always associated with waste production in the form of ash. Ash disposal can become an environmental crisis over time. These natural materials exhibit outstanding characteristics for enhancing bitumen, while being cost-effective and environmentally friendly. The present research investigates the effect of adding barley stalk ash (BSA) on the mechanical properties of asphalt mixture. To this end, bitumen was mixed with 5%, 10%, 15%, and 20% modifier. After examining the chemical properties and morphology of bitumen and ash, conventional asphalt binder tests, multiple stress creep recovery test (MSCR), Marshall Resistance, repeated load axial test (RLA) at high temperatures, and semi-circular bend test at intermediates and low temperatures were conducted. The results showed that BSA reduces the degree of penetration and plasticity and increases the softening point and hardness of bitumen. MSCR results also showed that modified bitumen experiences fewer permanent deformations at high temperatures. Furthermore, the repeated axial load test results revealed that BSA improves the high-temperature performance of the asphalt mixture and makes it more suitable for use in tropical regions. The results of the semi-circular bending test showed that barley stalk ash lowers the fatigue resistance of asphalt mixture at intermediate temperatures and cracking at low temperatures.

کلیدواژه‌ها English

Mechanical Properties
Barley Stalk Ash
Modified Bitumen
Hot Mix Asphalt
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