اثر نوع فیلر بر حساسیت رطوبتی مخلوط‌های آسفالتی تحت چرخه‌های ذوب و یخبندان و مقایسه با اجزای انرژی آزاد سطحی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشکده مهندسی عمران و محیط زیست، دانشگاه صنعتی امیرکبیر، تهران، ایران

2 مهندسی عمران (راه و ترابری) - دانشکده مهندسی عمران و محیط زیست - داتشگاه صنعتی امیرکبیر - تهران - ایران

چکیده

با توجه به نقش اساسی فیلر بر مشخصات مخلوط آسفالتی، این پژوهش به بررسی اثر فیلر بر حساسیت رطوبتی مخلوط‌های آسفالتی، تحت چرخه‌های متوالی ذوب و یخبندان می‌پردازد. علاوه بر این، اثر تغییر نوع فیلرهای سنگی بر مقاومت در برابر رطوبت مخلوط‌های آسفالتی به خصوص جایگزینی آن با مصالح بازیافتی بتنی، با رویکرد توسعه پایدار ارزیابی می‌شود. در تحقیق پیشرو، در ابتدا انجام آزمایش‌های مقاومت کشش غیر مستقیم و مدول برجهندگی با 1 ،3 ،6 و 10 چرخه ذوب و یخبندان انجام می‌شود و سپس انرژی شکست در آزمایش کشش غیر مستقیم محاسبه می‌شود. از طرف دیگر، مولفه‌های انرژی آزاد سطحی ماستیک حاوی انواع فیلرهای مدنظر به کمک روش اندازه‌گیری زاویه تماس محاسبه می‌شود. نتایج همه آزمایش‌های حساسیت رطوبتی نشان می‌دهد، جایگزینی تمام فیلر مصالح سنگی با سیمان پرتلند منجر به بهترین عملکرد در مقایسه با فیلر شاهد، فیلر سنگ آهک و فیلر بتن بازیافتی است. از طرفی روند تغییرات خصوصیات مکانیکی برای سایر فیلرهای جایگزین، وابسته به تعداد چرخه‌های ذوب و یخبندان است. نتایج حاکی از بهبود 15 درصدی نسبت مقاومت کششی مخلوط‌های آسفالتی حاوی فیلر بتن بازیافتی در مقایسه با فیلر سنگ آهک پس از نخستین چرخه ذوب و یخبندان است. اگرچه نتایج انرژی آزاد سطحی با نتایج خصوصیات مکانیکی نخستین چرخه ذوب و یخبندان هعخوانی دارد، ولی نمی‌تواند بیانگر رفتار بلند مدت مخلوط آسفالتی در چندین چرخه ذوب و یخبندان متوالی باشد.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Effect of Filler Type on Moisture Susceptibility of Asphalt Mixtures by Successive Freeze-Thaw Cycles and Comparing Results with Components of Surface Free Energy

نویسندگان [English]

  • Fereydoon Moghaddasnezhad 1
  • Mohammad Arbabpour Bidgoli 2
  • Koorosh Naderi 1
  • Seyedeh Zahra Mirtabar 1
1 Department of Civil Engineering and Environmental, Amirkabir University of Technology
2 School of Civil and Environmental Engineering, Road and Transportation Engineering, AmirKabir University of Technology, Tehran, Iran
چکیده [English]

Based on the important effects of filler on performance-related properties of asphalt mixtures, this study investigates the influence of filler type on moisture susceptibility of asphalt mixtures under multiple freeze-thaw cycles. Furthermore, the effect of changing the type of mineral fillers, especially replacing fillers with recycled concrete materials on moisture resistance of asphalt mixture, with sustainable development approach, is evaluated. In this study, first, the indirect tensile strength and the resilient modulus tests are conducted following 1, 3, 6, and 10 cycles of freeze-thaw and then the fracture energy is calculated through the results of indirect tensile test. Next, the surface free energy components of mastics with different types of filler are calculated using the static contact angle measurement method. The results of performance-based moisture susceptibility tests showed that replacing natural filler with Portland cement can result in the best performance compared to control mixture, limestone filler, and RCA filler. However, the evolution of mechanical properties of control filler, limestone filler, and RCA filler depends on the number of freeze/thaw cycles. At higher conditioning cycles, TSR values demonstrate a different behavior such that the TSR values of the asphalt mixture containing RCA filler increase up to 15% on average compared to the asphalt mixture containing limestone filler after the first cycle. Although the results of mechanical properties in initial freeze-thaw cycles are similar to surface free energy results. However, these results cannot predict the behavior of asphalt mixtures at higher freeze-thaw cycles.

کلیدواژه‌ها [English]

  • Asphalt Mixture
  • Moisture Susceptibility
  • Recycled Concrete Filler
  • surface free energy
  • Freeze-Thaw Cycles
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