تحلیل و قیاس ویژگی‌های میکروساختاری مغزه‌های آسفالتی میدانی و نمونه‌های آسفالتی آزمایشگاهی در انرژی‌های تراکمی مختلف

نویسندگان

1 استادیار، دانشکده مهندسی عمران، موسسه آموزش عالی علوم و فناوری آریان، تهران، ایران

2 استادیار گروه راه و ترابری، دانشکده فنی و مهندسی، دانشگاه پیام نور تهران، ایران

3 دانش آموخته کارشناسی ارشد، آزمایشگاه مکانیک خاک استان قم، قم، ایران

چکیده

در اکثر روشهای طرح اختلاط مخلوطهای آسفالتی به علت پیچیدگی تعیین پارامترهای میکرو،  پارامترهای ماکرو مورد توجه بوده و تعیین می­گردند. اما مخلوطهای آسفالتی گرم غیر همگن هستند و بنابراین پارامترهای ماکرو به تنهایی نمی­توانند رفتار مکانیکی مخلوطهای آسفالتی گرم را توصیف نمایند. در  این مقاله تحلیل و ارزیابی پارامترهای میکرو آرایش سنگدانه­ها در نمونه­های آسفالتی میدانی در قیاس با نمونه­های آزمایشگاهی در انرژیهای تراکمی مختلف انجام می­گردد. پردازش تصویر و کمی سازی پارامترهای ساختار داخلی مخلوطها با استفاده از عکسهای دوبعدی حاصل از برش نمونه­ها و نرم افزار iPAS2 انجام گردید. یافته­های مقایسه­ میان پارامترهای میکرو نمونه­های میدانی و آزمایشگاهی نشان داد که تعداد نقاط تماس در مغزه­ها نزدیک به تعداد نقاط تماس نمونه­های مارشالی بوده­اند که با انرژی تراکمی متوسط ساخته شده اند. همچنین معین گردید که با بررسی نمونه­های مخلوطهای آسفالتی از نگاه میکرو  می­توان به اطلاعات جدید و مفیدی دست یافت که ضرورت استفاده از پارامترهای میکرو را در طرح اختلاط مخلوطهای آسفالتی تایید می­نماید.

کلیدواژه‌ها


عنوان مقاله [English]

Analysis and Comparison of the Microstructural Characteristics of Field Asphaltic Cores and Laboratory Asphaltic Samples in Different Compaction Energies

نویسندگان [English]

  • Ali Nasrollahtabar Ahangar 1
  • Mahmood Reza Keymanesh 2
  • Meysam Rahimi 3
1 Assistant Professor, Civil department, Aryan Institute of Science and Technology, Tehran, Iran
2 Assistant Professor, Transportation department, Faculty of Engineering, Payam Noor University of Tehran, Iran
3 M.Sc., Grad., Laboratory of Soil Mechanics of Qom Province, Qom, Iran.
چکیده [English]

In most mix design methods, hot mixture asphalt (HMA) is considered to be a single object and only its macroscopic parameters are determined. This is because the microstructure of HMA is very complicated. Asphalt mixture is heterogeneous in nature; therefore, macroscopic parameters alone cannot describe the mechanical behavior of the mixture. In this paper, the analysis and evaluation of microstructure parameters of aggregates in field asphaltic samples are compared to laboratory samples in different compaction energies. Image processing and quantification of the internal structure parameters of the mixtures were performed using two-dimensional images from the cut-off of samples and iPAS2 software. The results of the comparison between the parameters of micro and field samples showed that the number of contact points in the cores was close to the number of contact points of Marshall Samples, which were made with moderate compaction energy. It was also determined that by examining mixtures of asphalt mixtures, new and useful information can be obtained that confirms the necessity of using micro parameters in the mixing design of asphalt mixtures.

کلیدواژه‌ها [English]

  • Aggregate particles
  • field Samples
  • contact length
  • contact points
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