ارزیابی آزمایشگاهی شاخص خودترمیمی در مخلوط های آسفالتی

نوع مقاله : علمی - پژوهشی

نویسندگان

1 دانشجوی کارشناسی ارشد، دانشکده مهندسی عمران، دانشگاه صنعتی شاهرود، ایران

2 استادیار، دانشکده مهندسی عمران، دانشگاه صنعتی شاهرود، ایران

چکیده

دراین تحقیق به منظور ساخت مخلوط‌های آسفالتی سبز دوستدار محیط زیست از سرباره فولادی با اندازه 75/4-5/9 میلیمتر به نسبت حجمی 60 درصد مصالح سنگی و پسماند گل قرمز با نسبت های 50 و 100 درصد از فیلر به عنوان جایگزین فیلر آهکی استفاده گردیده و شاخص خودترمیمی و حساسیت رطوبتی این مخلوط‌ها مورد ارزیابی قرار گرفته است. به منظور ارزیابی شاخص خودترمیمی، آزمایش خمش 3 نقطه‌ای بر روی نمونه‌های نیمه استوانه‌ای به صورت 7 سیکل ترمیم با استفاده از روش گرمادهی امواج ماکروویو انجام گرفته است. نتایج حاکی از آن بود که سرباره و 50 درصد گل قرمز در اولین سیکل ترمیم، مقدار نرخ ترمیم بهینه را نسبت به نمونه شاهد به ترتیب؛ 01/53 و 35/32 درصد افزایش داده‌اند. همچنین نتایج آزمایش حساسیت رطوبتی نشان دادکه میزان مقاومت خرابی رطوبتی در مخلوط‌های حاوی سرباره و 50 درصد گل قرمز نسبت به نمونه شاهد به ترتیب 16 و 21 درصد کاهش داشته است. استفاده از50 و 100 درصد گل کربناته به صورت جایگزین فیلر مصالح آهکی در مخلوط‌های حاوی سرباره مقاومت رطوبتی را به ترتیب 9 و 13 درصد افزایش داده است. همچنین این ضعف مقاومتی در نمونه شامل 50درصد گل قرمز به کمک استفاده از 50درصد گل کربناته جبران گردیده و مقاومت رطوبتی به میزان 12 درصد افزایش یافته است. باتوجه به نتایج بدست آمده استفاده از این مواد ضایعاتی به جای منابع طبیعی تجدیدناپذیر نظیرمصالح سنگی، علاوه بر کمک به حفظ محیط زیست باعث بهبود عملکرد ترمیم مخلوط‌های آسفالتی خواهد شد.

کلیدواژه‌ها


عنوان مقاله [English]

Laboratory Evaluation of Self-Healing Index in Asphalt Mixtures

نویسندگان [English]

  • Hassan Azargohar 1
  • Sayyed Ali Hosseini 2
  • Mohamad Yosefi mpghadam 1
1 Postgraduate Student, Faculty of Civil Engineering, Shahrood, Iran
2 Assistant Professor at Shahrood University of Technology, Shahrood, Iran
چکیده [English]

In this research, in order to construct environmentally friendly green asphalt mixtures, steel slag with a size of 9.5-4.75 mm to a volume ratio of 60% of aggregates and red mud waste with 50 and 100% ratios of filler has been used as an alternative to limestone filler, and self-healing index and moisture sensitivity of these mixtures have been evaluated. To do that, the semi-circular bending test (SCB) was performed by seven damage-healing cycles using the microwave irradiation heating method. Results indicated that the steel slag and 50% red mud waste in the first healing cycle increased the optimum healing ratio compared to the control sample, respectively; 53.01% and 32.35%. Also, the moisture susceptibility test results showed that the amount of moisture resistance in mixtures containing steel slag and 50% red mud decreased by 16% and 21%, respectively, compared to the control sample. Using 50% and 100% carbonation cake as a replacement for limestone filler in mixtures containing steel slag has increased the moisture resistance by 9% and 13%, respectively. Also, this weakness of moisture resistance in the sample containing 50% of red mud was compensated by using 50% of carbonation cake, and moisture resistance was increased by 12%. According to the obtained results, the use of these waste materials instead of non-renewable natural resources such as aggregates, in addition to preserve the non-renewable natural resources, will improve the healing performance of asphalt mixtures.

کلیدواژه‌ها [English]

  • Moisture sensitivity
  • Self-healing
  • Steel Slag
  • Red mud
  • Carbonation cake
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