ارزیابی شیارافتادگی و حساسیت رطوبتی بتن آسفالتی گرم حاوی الیاف نایلونی

نوع مقاله : علمی - پژوهشی

نویسندگان

1 استادیار، دانشکده فنی و مهندسی، دانشگاه زنجان، زنجان، ایران

2 دانشجوی کارشناسی ارشد، دانشکده فنی و مهندسی، دانشگاه زنجان، زنجان، ایران

چکیده

در این تحقیق به منظور بررسی تأثیر الیاف نایلونی بر عملکرد مخلوط­های آسفالتی، الیاف با طول ثابت 12 میلیمتر و در مقادیر 1/0، 2/0 و 3/0 درصد (بر اساس وزن مخلوط) به یک نوع بتن آسفالتی افزوده شدند. پس از تعیین قیر بهینه مربوط به ترکیب­های مختلف، خصوصیات حجمی مخلوط­های حاوی درصدهای مختلف الیاف، بررسی شد. مخلوط­های آسفالتی حاوی الیاف، تحت آزمایش­های استقامت و روانی مارشال و کشش غیر مستقیم قرار گرفتند. همچنین، آزمایش خزش دینامیکی با استفاده از دستگاه UTM-10، در سطوح تنش مختلف (kPa200 و kPa400) و دماهای مختلف (°c 40، °c 50 و °c 60)، به منظور ارزیابی تغییر شکل ماندگار (شیار افتادگی) مخلوط­های حاوی درصدهای مختلف الیاف نایلونی، به کار گرفته شد. پارامترهای تغییر شکل ماندگار، همچون منحنی خزش دینامیکی، عدد روانی و شیب کرنش خزشی (CSS)، برای تحلیل نتایج استفاده شدند. در نهایت رفتار خزشی نمونه­ها، با مدل خزش سه مرحله­ای ژو مدلسازی شدند. همچنین در این تحقیق، به منظور ارزیابی حساسیت رطوبتی مخلوط­ها، از نسبت مقاومت کششی (TSR) و نسبت مقاومت مارشال (MSR) استفاده گردید. بر اساس نتایج، استفاده از 1/0 درصد الیاف نایلونی، موجب بهبود مشخصات مکانیکی مخلوط­ها، از جمله استقامت و نسبت مارشال می­شود. همچنین، حساسیت رطوبتی مخلوط­های آسفالتی با افزایش مقدار الیاف، تا 1/0 درصد ابتدا کاهش یافته، سپس با افزایش مقدار الیاف در مخلوط، افزایش می­یابد. نتایج حاصل از آزمایش خزش دینامیکی و مدل ژو، نشان دادند که، افزودن 1/0 درصد الیاف نایلونی، طول ناحیه اول منحنی خزش و عدد روانی مخلوط­­ها را افزایش داده و شیب کرنش خزشی(CSS) را کاهش می­دهد، این نشان دهنده افزایش مقاومت مخلوط­های حاوی مقدار بهینه الیاف، در برابر تغییر شکل دایمی است.

کلیدواژه‌ها


عنوان مقاله [English]

Investigating the rutting and moisture damage properties of nylon fiber reinforced asphaltic concrete

نویسندگان [English]

  • Hosein Taherkhani 1
  • Siamak Afrouzi 2
1 Assistant Professor, Department of Engineering, University of Zanjan, Zanjan, Iran
2 MSc. Student, Department of Engineering, University of Zanjan, Zanjan, Iran
چکیده [English]

In order to investigate the effect of nylon fibers on the performance of asphaltic mixtures, 12mm long nylon fibers in different contents of 0.1, 0.2 and 0.3% (by the weight of total mixture) were added to a typical asphaltic concrete. After determination of the optimum binder content of the mixtures, the volumetric properties of the mixtures containing different percentages of nylon fibers were analyzed. Then, the fiber reinforced mixtures were subjected to Marshall Stability, flow an indirect tensile strength tests. In addition, in order to evaluate the permanent deformation behavior of the mixtures, using UTM-10, dynamic creep tests were conducted under different stress levels of 200 and 400kPa, and at different temperatures of 40, 50 and 60°C. Dynamic creep curve, flow number and the creep strain slope (CSS) were used for analysis of the results. Then, the creep behavior of the mixtures was modeled using the three-stage model developed by Zhou et al. The resistance against moisture damage of the mixtures were also evaluated using the tensile strength ratio (TSR) and Marshall Stability ratio (MSR).  The results showed that the mechanical properties of the mixture such as the Marshall stability, Marshall Quotient and the indirect tensile strength of the mixture can be improved by modifying with 0.1% of nylon fiber.  Also, the moisture sensitivity of the mixtures decreases with increasing fiber content, up to the fiber content of 0.1%, after which, increases with increasing fiber content. The results of dynamic creep tests and modelling the creep curve using the three=stage model showed that the mixture containing 0.1% of nylon fiber has the highest length of primary creep region and flow number and the lowest creep stain slope, indicating that its resistance against the permanent deformation is the highest.    

کلیدواژه‌ها [English]

  • Asphalt concrete
  • nylon fibers
  • Moisture Damage
  • Dynamic Creep
  • three-stage model
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