ارزیابی حساسیت رطوبتی مخلوط‌های آسفالتی اصلاح‏ شده با پودر کربنات کلسیم کریستال

نوع مقاله : پژوهشی

نویسندگان

• غلامحسین حامدی ¹
• محسن سهرابی ²

¹ دانشگاه گیلان

² دانشگاه ارومیه

10.22067/civil.v32i3.69430

چکیده

در این پژوهش تأثیر پوشش سطح سنگ‌دانه‌ها با پودر کربنات کلسیم کریستال بر حساسیت رطوبتی مخلوط‌های آسفالتی با استفاده از روش‌های مکانیکی و ترمودینامیکی مورد ارزیابی قرارگرفته استنتاج آزمایش‌های مکانیکی نشان می‌دهد مقاومت کششی غیرمستقیم نمونه‌های اصلاح‌شده افزایش یافته است. همچنین، نتایج روش انرژی آزاد سطحی نشان می‌دهد که اصلاح سطح سنگ‌دانه‌ها به ترتیب موجب کاهش و افزایش مؤلفه‌های اسیدی و بازی آن‌ها شده است. این تغییرات موجب افزایش چسبندگی سنگ‌دانه با قیر که یک ماده اسیدی است، می‌‌شود. بعلاوه مقادیر انرژی آزادشده در حضور رطوبت برای نمونه‌های اصلاح‌شده کاهش‌یافته است که بیانگر کاهش تمایل مخلوط به عریان‏شدگی است

کلیدواژه‌ها

• خرابی رطوبتی
• اصلاح سنگدانه
• کربنات کلسیم میکرونیزه
• لاتمن اصلاح شده
• انرژی آزاد سطحی

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عنوان مقاله [English]

Evaluation of Moisture Sensitivity of Modified Asphalt Mixtures with Crystal Calcium Carbonate Powder

نویسندگان [English]

• Gholam Hossein Hamedi ¹
• Mohsen Sohrabi ²

¹ University of Guilan

² Urmia University

چکیده [English]

In this research, by using mechanical and thermodynamic methods, the effect of surface coatings of aggregates with crystal calcium carbonate powder on the moisture sensitivity of asphalt mixtures has been evaluated. The results show that the indirect tensile strength of the modified specimens has been increased. as Also, the result of SFE method indicates that, with aggregate surface modification, their acidic and basic components respectively have been reduced and increased. Due to these changes, the adhesion between aggregates and bitumen (which is an acidic substance) increase. In addition, the amount of released energy in the presence of moisture has been reduced for modified specimens, which indicates a reduction in the tendency of the mixture for stripping.

کلیدواژه‌ها [English]

• Moisture damage؛ Aggregates modification
• ؛ Micronized calcium carbonate؛ Modified lottman test؛ Surface free energy

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