ارزیابی آزمایشگاهی عملکرد آسفالت حفاظتی میکروسرفیسینگ حاوی الیاف پلی‌پروپیلن

نوع مقاله : علمی - پژوهشی

نویسندگان

1 دانشکده مهندسی عمران، دانشکده مهندسی عمران، دانشگاه علم‌و‌صنعت ایران، تهران، ایران

2 دانشجوی کارشناسی ارشد گرایش راه و ترابری، دانشکده مهندسی عمران، دانشگاه علم‌و‌صنعت ایران، تهران، ایران

3 دانشجوی دکتری گرایش راه و ترابری، دانشکده مهندسی عمران، دانشگاه علم‌و‌صنعت ایران، تهران، ایران

چکیده

با توجه به اهمیت راه‌ها در ایجاد ارتباط بین نواحی مختلف، همواره مسئله تعمیر و نگهداری راه‌ها امری حیاتی برای سازمان‌های حمل‌ونقل محسوب می‌شود. یکی از مهم‌ترین روش‌های تعمیر و نگهداری پیشگیرانه راه‌ها استفاده از میکروسرفیسینگ است. هدف از این پژوهش بررسی تأثیر اضافه نمودن الیاف پلی‏پروپیلن در طرح اختلاط میکروسرفیسینگ جهت سنجش عملکرد آن است. در این راستا، به‌منظور ارزیابی عملکرد مخلوط میکروسرفیسینگ، از ۵ ترکیب مختلف حاوی صفر، 05/0، 10/0، 15/0 و 20/0 درصد الیاف پلی‏پروپیلن بر اساس وزن کل سنگدانه استفاده گردید. ارزیابی نمونه‌های میکروسرفیسینگ به‌واسطه آزمایش‌های چسبندگی مرطوب، چرخ بارگذاری شده و سایش در شرایط مرطوب مطابق با استاندارد ASTM D6372  انجام شد. نتایج طراحی نشان داد که مخلوط‌های اصلاح‏شده با الیاف پلی‏پروپیلن، موجب بهبود عملکرد میکروسرفیسینگ می‌شوند. به‌طوری که در میان مخلوط‌ها، مخلوط میکروسرفیسینگ حاوی 10/0 درصد الیاف موجب افزایش چسبندگی به قیر در مدت‌زمان 30 و 60 دقیقه به ترتیب به میزان 6/20 و 1/21 درصد، کاهش جابه‌جایی عمودی و جانبی به ترتیب به میزان 2/38 و 9/28 درصد، بهبود مقاومت در برابر سایش به میزان 6/35 درصد و کاهش قیرزدگی به میزان 4/25 درصد گردید. مخلوط حاوی 10/0 درصد الیاف نسبت به نمونه شاهد دارای 6/1 درصد قیر امولسیون بیشتر به‌منظور دستیابی به چسبندگی مناسب در زمان مشخص است. از سوی دیگر طبق نتایج بدست آمده، استفاده بیش از مقدار بهینه‏ی الیاف پلی‏پروپیلن در مخلوط میکروسرفیسینگ، باعث پخش نشدن مناسب الیاف در مخلوط و تشکیل توده‌های گلوله‏ای از الیاف شده که ممکن است باعث کاهش عملکرد مناسب مخلوط ‏شود.

کلیدواژه‌ها


عنوان مقاله [English]

Experimental Performance Evaluation of Microsurfacing Surface Treatment Containing Polypropylene Fibers

نویسندگان [English]

  • Hassan Ziari 1
  • Mohammad Javad Mahdizadeh 2
  • Mahdi Zalnejad 3
1 Professor, Faculty of Civil Engineering, Iran University of Science and Technology, Tehran, Iran
2 M.Sc. Highways and Transportation, Faculty of Civil Engineering, Iran University of Science and Technology, Tehran, Iran
3 PhD Candidate, Faculty of Civil Engineering, Iran University of Science and Technology, Tehran, Iran
چکیده [English]

Appreciating the crucial importance of roads in keeping different areas connected to one another, road maintenance and repair represent a vital role of any road transportation management. Microsurfacing is an important preventive method for paved road maintenance. The present research is aimed at investigating the effect of adding polypropylene fibers into microsurfacing mix on its performance. For this purpose, performance evaluation of the microsurfacing mix was conducted by preparing five different mixes containing polypropylene fibers at different dosages, namely 0, 0.05, 0.10, 0.15, and 0.20% by weight to the weight of total aggregate. Analyses were performed by doing wet cohesion test, loaded wheel test, and wet track abrasion test according to ASTM D6372. Results showed that the polypropylene fiber-reinforced mixes exhibited improved microsurfacing performance. Among other mixes, the one containing the fibers at 0.10% showed 20.6 and 21.1% higher bitumen cohesion in the 30- and 60-min cohesion tests, respectively. Also using this mix, vertical and lateral displacements could be reduced by 38.2 and 28.9%, respectively, resistance to abrasion improved by 35.6%, and bleeding decreased by 25.4%. Compared to the control specimen, the mix containing polypropylene fibers at 0.10% exhibited 1.6% higher bitumen emulsion, providing for achieving the desired cohesion within a predefined period of time. The other results showed that excessive incorporation of the polypropylene fibers into the microsurfacing mix would inhibit optimal dispersion of the fibers across the mix, leading to accumulation of the fibers in the form of nodules and hence deteriorating the mix performance.

کلیدواژه‌ها [English]

  • Surface Treatment
  • Polypropylene Fiber
  • Preventive Maintenance
  • Microsurfacing
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