بررسی رفتار مقاومتی بتن غلتکی حاوی مصالح خرده آسفالت بازیافتی و نانوسیلیس

نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه مهندسی عمران، دانشگاه خلیج فارس، بوشهر، ایران.

2 گروه مهندسی عمران، دانشگاه محقق اردبیلی، اردبیل، ایران.

3 دانشکده فناوری‌های نوین، دانشگاه محقق اردبیلی، اردبیل، ایران.

چکیده

بتن غلتکی، بتنی با اسلامپ صفر است که کاربرد آن در روسازی راه‌ها، رو به افزایش است. از طرفی، استفاده از خرده آسفالت بازیافتی در بتن غلتکی راهکاری زیست‌محیطی برای کاهش آلایندگی‌ها می‌باشد. در این تحقیق، اثر خرده آسفالت و نانوسیلیس بر رفتار مقاومتی بتن غلتکی بررسی شده است. بدین منظور، نمونه‌های استوانه‌ای، برای تعیین رطوبت بهینه و وزن مخصوص تهیه شده، سپس مقاومت فشاری نمونه‌ها و منحنی تنش و کرنش آنها در رطوبت بهینه به‌دست آمده است. آنگاه مقدار سطح زیر نمودار تنش- کرنش و مقدار جذب انرژی اندازه‌گیری گردیده است. نتایج نشان داده است که افزودن خرده آسفالت، مقدار رطوبت بهینه در ساخت نمونه‌های بتن غلتکی را کاهش می‌دهد. در نقطه مقابل، افزودن نانوسیلیس میزان رطوبت بهینه نمونه‌ها را افزایش داده و حداکثر وزن مخصوص خشک آن‌ها را بیشتر می‌نماید. جایگزین کردن خرده آسفالت به‌جای مصالح سنگی نشان داده است که مقاومت فشاری نمونه‌های بتن غلتکی در سن 7 و 90 روزه کاهش می‌یابد. از طرفی نانوسیلیس نتوانسته است مقاومت فشاری کاهش یافته را بهبود دهد، به‌طوری که تأثیر منفی نانوسیلیس بر مقاومت فشاری در سن 90 روزه بیشتر از سن 7 روزه است. در این پژوهش مشاهده شده است که افزودن خرده آسفالت سطح زیر نمودار تنش- کرنش را افزایش داده و میزان جذب انرژی را بهبود می‌دهد. در نقطه‌ مقابل، افزودن نانوسیلیس به نمونه شاهد و نمونه‌های حاوی خرده آسفالت، شکل‌پذیری و میزان جذب انرژی را افزایش نمی‌دهد.  

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Mechanical Performance of Roller-compacted Concrete Containing Recycled Asphalt Aggregate and Nano-Silica

نویسندگان [English]

  • Mahmoud Malakouti Olounabadi 1
  • Milad Jahanbazi 1
  • Seyed Shaker Hashemi 1
  • Babak Golchin 2
  • Ramin Meshkabadi 3
1 Department of Civil Engineering, Persian Gulf University, Bushehr, Iran.
2 Department of Civil Engineering, University of Mohaghegh Ardabili, Ardabil, Iran.
3 Faculty of Advanced Technologies, University of Mohaghegh Ardabili, Ardabil, Iran.
چکیده [English]

Roller-compacted concrete, a type of concrete with zero slump, is being used in road pavement construction. The use of recycled asphalt in roller-compacted concrete is an enviromental approach for reducing emissions. This study examines the impact of recycled asphalt aggregate and nano-silica on the strength behavior of roller-compacted concrete. Cylindrical samples were fabricated to determine optimal moisture content and maximum dry density. The compressive strength, along with stress and strain curves at optimal moisture, were evaluated. Additionally, the surface area under the stress-strain curve and energy absorption were measured. Results indicate that adding asphalt aggregates decreases the optimal moisture content in roller-compacted concrete. Conversely, nano-silica increases the optimal moisture content and enhances the maximum dry density of the samples. Replacing recycled asphalt with coarse aggregate revealed a decrease in compressive strength of roller-compacted concrete samples at both 7 and 90 days. Moreover, nano-silica did not improve the reduced compressive strength, with its negative impact being more pronounced at 90 days than at 7 days. The study also found that recycled asphalt increases the area under the stress-strain curve and enhances energy absorption. However, adding nano-silica to control samples and those with recycled asphalt does not improve ductility or energy absorption.

کلیدواژه‌ها [English]

  • Roller-compacted Con-crete
  • Recycled Asphalt Aggre-gate
  • Nano-silica
  • Optimal Humidity
  • Resistance
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