بررسی مدل‌های پیش‌بینی مدول دینامیک جهت تعیین خواص ویسکوالاستیک مخلوط‌های آسفالتی داغ، گرم و حاوی خرده آسفالت

نوع مقاله: مقاله پژوهشی

نویسندگان

1 دانشجوی دکتری، دانشکده مهندسی عمران، دانشگاه سمنان

2 استاد، دانشکده مهندسی عمران، دانشگاه سمنان

چکیده

یکی از نیازهای طراحی روسازی آسفالتی به روش مکانیستیک تجربی تعیین مشخصات ویسکوالاستیک مخلوط آسفالتی، از جمله مدول دینامیک و زاویه فاز، است. از آنجایی که آزمایش تعیین مدول دینامیک مخلوط آسفالتی زمان­بر و گران است، مدل­هایی جهت پیش­بینی آن توسط محققین مختلف ارائه شده است. هدف از مطالعه حاضر، بررسی برخی مدل­های پیش­بینی موجود جهت تعیین خواص ویسکوالاستیک مخلوط­های آسفالتی داغ، گرم و حاوی خرده آسفالت است. برای این منظور، مخلوط­های آسفالتی با دو نوع دانه­بندی (با اندازه سنگدانه بیشینه اسمی 5/9 و 19 میلی­متر) که معرف مخلوط­های لایه رویه و آستر هستند و نیز سه نوع قیر خالص، قیر اصلاحی با افزودنی ساسوبیت و قیر بازیافتی به روش روسازی ممتاز طراحی شدند. آزمایش­های رئومتر برشی دینامیک روی قیرها و تعیین مدول دینامیک روی مخلوط­ها انجام شدند. مدل تجربی NCHRP 1-40D و مدل­های میکرومکانیکی Hirsch و شکل اصلاح شده آن برای پیش­بینی مدول دینامیک مخلوط آسفالتی با داده­های آزمایشگاهی ارزیابی شدند. با بررسی نتایج مشخص شد که مدل تجربی NCHRP با انجام واسنجی نتایج خیلی خوبی دارد (R2>0.95) و پس از آن مدل­های نیمه تجربی و میکرومکانیکی Hirsch اصلاح شده و Hirsch عملکرد مناسبی داشتند. تمامی مدل­ها در پیش­بینی مدول مخلوط­های با دانه­بندی ریزتر عملکرد بهتری داشتند. به نظر می­رسد که مدل­های مورد بررسی در به حساب آوردن مقاومت ناشی از برخورد سنگدانه­ها چندان موفق عمل نمی­کنند. استفاده از مدل­های پیش­بینی مدول برای پیاده­سازی روش طراحی جدید در سطح 2 مناسب می­باشد.

کلیدواژه‌ها


عنوان مقاله [English]

Evaluation of Dynamic Modulus Prediction Models for Determination of Viscoelastic Properties of Hot, Warm and RAP-contained Asphalt Mixtures

نویسندگان [English]

  • Amin Tanakizadeh 1
  • Gholamali Shafabakhsh 2
1 Faculty of civil engineering, Semnan university, Semnan, Iran
2 Faculty of civil engineering, Semnan university, Semnan, Iran
چکیده [English]

One of the requirements for mechanistic-empirical design of asphalt pavement is determining the viscoelastic properties of asphalt mixture, including dynamic modulus and phase angle. Since the dynamic modulus test of asphalt mixture is time consuming and expensive, some prediction models have been proposed by various researchers. The purpose of the present study was to investigate some of the available predictive models to determine the viscoelastic properties of hot, warm and RAP-contained asphalt mixtures. For this aim, asphalt mixtures with two types of gradation (with a nominal maximum aggregate size of 9.5 and 19 mm) representing the mixtures prepared for surface and binder layers, as well as three kinds of bitumen, including neat bitumen, Sasobit-modified bitumen and reclaimed bitumen, were designed according to Superpave method. Dynamic shear rheometer and dynamic modulus tests were performed on the bitumen and the mixtures, respectively. The empirical model of NCHRP 1-40D and micro-mechanical models of Hirsch and its modified form were evaluated for estimating the dynamic modulus of asphalt mixtures using laboratory measurements. It was found that the empirical model of NCHRP performed very well after calibration (R2> 0.95) and then the semi-empirical and micromechanical models of modified Hirsch and Hirsch had a good performance. All models had a better predictability for the modulus of fine graded mixtures. It seems that the considered models are not successful in taking into account the resistance from aggregates interlocking. Application of dynamic modulus prediction models is suitable for implementation of the new design method at Level 2.

کلیدواژه‌ها [English]

  • Dynamic modulus
  • Prediction models
  • Warm mix asphalt (WMA)
  • Reclaimed asphalt pavement (RAP)
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