بررسی تاثیر استفاده از اکریلات استایرن اکریلونیتریل بر خرابی خستگی مخلوط‏‌های آسفالتی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشگاه گیلان

2 دانشگاه آزاد اسلامی واحد اهر

3 دانشگاه آزاد اسلامی، واحد ایلخچی

چکیده

یکی از پارامترهای موثر در رخداد ترک ‌خوردگی خستگی خصوصیات قیر مورد استفاده می‏‌باشد. یکی از رو‌ش‌های کنترل این نوع خرابی استفاده از اصلاح‌ کننده‌های قیر، سنگدانه یا مخلوط آسفالتی است. بر این اساس، در این پژوهش سعی شده است تا تاثیر استفاده از افزودنی پلیمری به نام اکریلات استایرن اکریلونیتریل (ASA) به عنوان اصلاح‏ کننده قیر بر پتانسیل خرابی خستگی در مخلوط‏‌های آسفالتی مورد بررسی قرار گیرد. دو نوع سنگدانه، با خصوصیات کانی‎‏ شناسی مختلف، قیر 16-64 PG و افزودنی ASA در دو درصد مختلف جرم قیر از مواد مورد استفاده در این پژوهش بوده‌‏اند که در دو دما و پنج سطح تنش مختلف مورد آزمایش قرار گرفته‎‏‌اند. برای تعیین درصد قیر بهینه از روش طرح اختلاط مارشال و برای تعیین عمر خستگی مخلوط‌‏های آسفالتی از روش مقاومت کششی غیر مستقیم استفاده شده است. نتایج این پژوهش نشان می‌‏دهد که استفاده از افزودنی‏‌های پلیمری باعث شده است که عمر خستگی مخلوط‌‏های آسفالتی افزایش یابد. عمر خستگی نمونه‌‏های ساخته‏ شده با سنگدانه‌‏های گرانیتی نسبت به سنگدانه‌‏های سنگ ‏آهک بیشتر بوده است اما افزایش عمر در نتیجه استفاده از ASA افزایش بیشتری در عمر نمونه‏‌های ساخته ‏شده با سنگدانه گرانیتی ایجاد شده است. افزایش در میزان دما و سطح تنش نیز همانطور که انتظار می‏رفت باعث کاهش در عمر خستگی نمونه‏‌های مخلوط آسفالتی شده است که این کاهش در نمونه‌‏های ساخته ‏شده با قیرهای اصلاح‏ شده با مواد پلیمری بسیار کمتر از نمونه‏‌های کنترل بوده است.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Investigating the Effect of Acrylon Acrylonitrile Acrylate on the Fatigue Life of Asphalt Mixtures

نویسندگان [English]

  • Gholam Hossein Hamedi 1
  • Ali Alipour 2
  • Fariba Karimian Khosroshahi 3
1 Department of Civil Engineering, Faculty of Engineering, University of Guilan
2 Department of Civil Engineering, Islamic Azad University-Ahar Branch
3 Islamic Azad University-Ilkhchi Branch
چکیده [English]

Over time, with repeated loading, if the amount of strain or stress exceeds the strength of the asphalt mixtures, cracks will form on the surface and under the asphalt mixture layer. These cracks gradually develop as the number of loads increases and spreads to the asphalt body. Fatigue is one of the most important factors that reduce the life of asphalt pavements. One of the effective parameters in the occurrence of fatigue cracking is the properties of the bitumen used. According to previous studies, the use of nanomaterials and polymer additives has been considered by researchers in recent years. Due to the much higher cost of production or production of polymeric materials, the use of these materials in this research has been considered. One way to control this type of failure is to use bitumen, aggregate or asphalt mixers. Accordingly, in this study, the effect of using a polymer additive called acrylon acrylonitrile acrylate (ASA) as a bitumen modifier on the potential for fatigue cracking in asphalt mixtures has been investigated. Two types of aggregates, with different mineralogical properties, PG 64-16 as bitumen and ASA additive, in two different percentages of bitumen mass were the materials used in this study, which were tested at two temperatures and five different stress levels. To determine the percentage of optimal bitumen, the Marshall mixing design method has been used and to determine the fatigue life of asphalt mixtures, the indirect tensile fatigue test method has been used. The results of this study show that the use of polymer additives has increased the fatigue life of asphalt mixtures. The fatigue life of granite aggregate specimens was longer than that of limestone aggregates, but the increase in life resulting from the use of ASA increased the fatigue life of granite aggregate specimens. The increase in temperature and stress level, as expected, has reduced the fatigue life of asphalt mix samples, which is much lower in samples made of bitumen modified with polymeric materials than the samples.

کلیدواژه‌ها [English]

  • Asphalt mixtures
  • Fatigue cracking
  • Bitumen modification
  • Acrylon acrylonitrile acrylate
  • Indirect tensile loading

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نشریه مهندسی عمران امیرکبیر
دوره 53، شماره 9
آذر 1400
صفحه 3785-3802

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