بررسی تاثیر پیرشدگی قیر بر مقاومت به شن زدگی و ترک خوردگی مخلوطهای آسفالتی ساخته شده با مصالح سنگی سیلیسی و آهکی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی دکتری، گروه مهندسی عمران، واحد علوم و تحقیقات، دانشگاه آزاد اسلامی، تهران، ایران

2 دانشیار، گروه مهندسی عمران، دانشگاه زنجان، زنجان، ایران

3 استادیار، گروه مهندسی عمران، واحد علوم و تحقیقات، دانشگاه آزاد اسلامی، تهران، ایران

چکیده

در این پژوهش تاثیر شرایط مختلف پیرشدگی بر مقاومت به شن زدگی و مقاومت به ترک خوردگی مخلوط آسفالتی ساخته شده با دو نوع مصالح سنگی مختلف شامل مصالح سنگی آهکی و سیلیسی مطالعه گردیده است. نمونه‌های آسفالتی ساخته شده با مصالح سنگی آهکی و سیلیسی، تحت شرایط پیرشدگی کوتاه مدت، بلند مدت 5 روزه و بلند مدت 7 روزه قرار گرفته و آزمایش افت وزنی کانتابرو و خمش نیمدایره ای در دمای محیط بر روی آنها انجام شده و نتایج با یکدیگر و حالت کنترل بدون اعمال پیرشدگی مقایسه گردیده‌اند. نتایج نشان می‌دهد مخلوطهای ساخته شده با مصالح سنگی آهکی مقاومت به شن‌زدگی و مقاومت به ترک خوردگی بیشتری از مخلوط ساخته شده با مصالح سنگی سیلیسی دارند. این نتایج ناشی از بافت زبرتر سنگدانه‌های آهکی نسبت به سیلیسی و داشتن ترکیبات شیمیایی اکسید منیزیم و اکسید کلسیم بیشتر آنها می‌باشد. همچنین، نتایج نشان می‌دهند که پیرشدگی باعث کاهش مقاومت به شن‌زدگی، انرژی شکست، چقرمگی‌ شکست، شکل‌پذیری و بار بحرانی قابل تحمل تا شکست در آزمایش خمش نیمدایره‌ای می‌گردد. میزان تاثیر پیرشدگی بر این ویژگی‌ها به جنس سنگدانه‌ها و نوع خصوصیت عملکردی بستگی دارد. از نظر مقاومت به شن‌زدگی پیرشدگی تاثیر بیشتری بر روی مخلوط ساخته شده با مصالح آهکی دارد، ولی خصوصیات شکست شامل انرژی شکست، بار بحرانی و چقرمگی شکست در مخلوطهای ساخته شده با مصالح سیلیسی تاثیر بیشتری از پیر شدگی می‌گیرند

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Investigating the Effect of Asphalt Ageing on the Mechanical Properties of Asphalt Mixtures Made by Limestone and Siliceous Aggregates

نویسندگان [English]

  • Seyed Amir Hossein Beheshti 1
  • Hassan Taherkhani, 2
  • Parham Hayati 3
  • Alireza Sarkar 3
1 Ph.D. Student, Civil Engineering Department, Science and Research Branch, Islamic Azad University, Tehran, Iran.
2 Associate Professor, Civil Engineering Department, University of Zanjan, Zanjan, Iran.
3 Assistant Professor, Civil Engineering Department, Science and Research Branch, Islamic Azad University, Tehran, Iran.
چکیده [English]

In this research the effects of different aging conditions on the raveling and cracking resistance of asphalt concrete made by two types of aggregates, namely limestone and siliceous source have been investigated. Asphalt samples made by siliceous and limestone aggregates were made and were subjected to short-term and 5 and 7-day long-term aging conditions. After that, they were tested using Cantabro mass loss and semi-circular bending test at ambient temperature. Results reveal that the mixture made by limestone aggregates has more raveling and cracking resistance than the mixture made by siliceous aggregates. These results were found to be due to rougher texture and more angularity of limestone particles and also having more MgO and CaO content in their chemical compositions. Results also reveal that aging results in reduction of raveling resistance, fracture energy, fracture toughness, ductility and critical load sustained before fracture in semi-circular bending test. The effect of aging on these properties was found to be dependent on the type of aggregates and the considered property. In terms of raveling resistance, the aging is more effective on the mixture made by limestone aggregates; however, the fracture properties and cracking resistance of the mixture made by siliceous aggregates are more affected by aging than the mixture made by limestone aggregates.
.

کلیدواژه‌ها [English]

  • Asphalt Concrete
  • Aging
  • Limestone Aggregates
  • Siliceous Aggregates
  • Raveling
  • Semi-Circular Bending

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