نشریه مهندسی عمران امیرکبیر

نشریه مهندسی عمران امیرکبیر

بررسی دوام بتن غلتکی حاوی نسبت‌‌های مختلف حجمی ضایعات آسفالت در برابر شرایط محیطی مخرب

نوع مقاله : مقاله پژوهشی

نویسندگان
گروه مهندسی عمران، واحد ارومیه، دانشگاه آزاد اسلامی، ارومیه، ایران
چکیده
از گذشته تاکنون در ایران، احداث راه‌های آسفالتی رایج بوده و امروزه با حجم زیادی پسماند و نخاله‌های آسفالتی ناشی از تخریب و انقضای این مسیرها مواجه هستیم. این ضایعات عمدتاً به حاشیه و اطراف شهرها منتقل می‌شوند و سازوکار خاصی برای بازیافت آن در صنایع وجود ندارد. علاوه بر آن نوسازی راه‌ها و مسیرهای جدیدی که تحت بار ترافیکی سنگین قرار ندارند، لازم نیست با مصالح دسته اول و با کیفیت ساخته شوند. زیرا رویه فعلی باعث افزایش هزینه ساخت و تخریب معادن و منابع طبیعی می‌شود. در حالیکه می‌توان بسیاری از راه‌ها و مسیرهایی که در برابر عوامل محیطی مهاجم یا خورنده قرار ندارند، از رویه‌های مصالح بازیافت شده ساخته شوند. در این تحقیق برای ساخت بتن غلتکی از نسبت‌های مختلف حجمی‌ سنگدانه آسفالت بازیافتی استفاده شد. بدین صورت از درشت‌دانه آسفالتی در نسبت‌های مختلف حجمی‌ 10%، 20%، 30%، 40% و 50% بجای درشت‌دانه طبیعی در بتن غلتکی استفاده شد. سایر ضوابط بر اساس استاندارد ملی 14830 در دستورکار قرار گرفت. همچنین برای افزایش تراکم و کیفیت بتن از میکروسیلیس به میزان 10% وزنی سیمان استفاده شد. آزمایشات انجام شده در این تحقیق شامل لس‌آنجلس سنگدانه، اسلامپ، وزن مخصوص، ضریب تراکم، میزان جذب آب (30 دقیقه و 72 ساعت)، دوام در برابر چرخه‌های ذوب-یخبندان و بررسی دوام بتن در برابر شرایط اسیدی می‌باشد. جمع‌بندی نتایج این تحقیق نشان داد که میزان کاهش دوام طرح AS-10% عمدتاً کمتر از 10% می‌باشد و می‌تواند در ساخت روسازی بتن غلتکی برای استفاده در مسیرهای کم تردد مورد استفاده قرار گیرد.
کلیدواژه‌ها
موضوعات

عنوان مقاله English

Investigation of the Durability of RCCP Concrete Containing Various Volumetric Ratios of Asphalt Waste Against Harsh Environmental Conditions

نویسندگان English

Ashkan KhodaBandehLou
yaser safaralizadeh
Associate Professor, Department of Civil Engineering, Ur.C., Islamic Azad University, Urmia, Iran
چکیده English

Over the years, asphalt road construction has been common in Iran, and today, These wastes are mainly transported to the outskirts and surrounding areas of cities, and there is no specific system for recycling them in industries. Additionally, the reconstruction of roads and new routes that are not subjected to heavy traffic does not require the use of first-grade, high-quality materials, as the current practice leads to an increase in the cost of construction and destruction of mines and natural resources. However, it is possible to construct many roads and routes that are not exposed to aggressive or corrosive environmental factors using recycled materials. In this study, different volumetric ratios of recycled asphalt aggregates were used to produce concrete. In this way, recycled asphalt coarse aggregates were used in different volumetric ratios of 10%, 20%, 30%, 40%, and 50% in place of natural aggregates in concrete. Other specifications and requirements were based on the national standard 14830. Furthermore, to increase the density and quality of the concrete, 10% by weight of microsilica was used. The tests conducted in this study included aggregate Los Angeles abrasion, slump, specific weight, compaction factor, water absorption (30 minutes and 72 hours), durability against freeze-thaw cycles, and assessment of concrete durability under acidic conditions. The summary of the results of this study showed that the reduction in the durability of the AS-10% design is mainly less than 10%, and it can be used in the construction of concrete pavement for low-traffic roads.

کلیدواژه‌ها English

Asphalt Recycling
Roller-Compacted Concrete (RCC)
Green Concrete
Concrete Durability
Recycled Materials
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