پژوهشنامه حمل و نقل

پژوهشنامه حمل و نقل

بررسی اثر کربن بلک بر قیر و حساسیت رطوبتی آسفالت متخلخل و SMA با استفاده از پارامترهای انرژی آزاد سطحی

نوع مقاله : مقاله پژوهشی

نویسندگان
مهدی فرجی 1
حسن طاهرخانی 2
1 دانشجوی دکترا، گروه مهندسی عمران، دانشگاه زنجان، زنجان، ایران
2 دانشیار، گروه مهندسی عمران، دانشگاه زنجان، زنجان، ایران
10.22034/tri.2023.355641.3074
چکیده
حساسیت رطوبتی از خرابی‌های مهم روسازی‌های آسفالتی است که در اثر جدایی پیوند بین قیر و مصالح سنگی در محل اتصال آن‌ها توسط اثر آب ایجاد می شود. یکی از راه‌های موجود برای افزایش مقاومت در برابر خرابی های ناشی از رطوبت، استفاده از افزودنی‌ها است. در این پژوهش، اثر افزودنی کربن بلک یا دوده صنعتی به یک قیر خالص و مخلوطهای آسفالتی متخلخل و آسفالت ماستیک درشت دانه (SMA) ساخته شده با آن از نظر حساسیت رطوبتی مورد بررسی قرار گرفته است. مقادیر0، 4، 8، 12 و 16% (نسبت به وزن قیر) از کربن بلک به قیر افزوده شده و آزمایشهای درجه نفوذ، نقطه نرمی و درجه انگمی و اجزای انرژی آزاد سطحی قیر و مقاومت کششی در حالت خشک و مرطوب مخلوطهای آسفالتی مورد ارزیابی قرار گرفته اند. مکانیزم اثر افزودنی کربن بلک بر میزان افزایش مقاومت در برابر خرابی های ناشی از رطوبت با استفاده از روش‌های انرژی آزاد سطحی و مقایسه آن با نتایج آزمایش مقاومت کششی بررسی شده است. نتایج نشان می دهد که میزان درجه نفوذ و درجه انگمی قیر تا 8% کاهش و بعد از آن افزایش می یابد. نقطه نرمی قیر نیز تا 8% افزایش و بعد از آن کاهش می یابد. مولفه های انرژی آزاد سطحی قیر نیز نشان می دهد که افزودن کربن بلک تا 8% انرژی سطحی کل افزایش و بعد از آن کاهش می یابد. همچنین، مقاومت کششی در حالت خشک و مرطوب آسفالت متخلخل تا 8% کربن بلک افزایش و بعد از آن کاهش می یابد. نسبت مقاومت کششی مخلوطهای آسفالتی نیز تا 8% افزودنی کربن بلک افزایش و بعد از آن کاهش می یابد. نتایج تحقیق همچنین مشخص می کند که همبستگی خوبی بین پارامترهای به دست آمده از انرژی سطحی و نتایج آزمایش حساسیت رطوبتی مخلوطهای آسفالتی با نسبت مقاومت کششی به دست می آید.
کلیدواژه‌ها
کربن بلک
حساسیت رطوبتی
قیر
انرژی آزاد سطحی

موضوعات

عنوان مقاله English

Investigating the Effects of Carbon Black on Asphalt Binder and Moisture Damage Resistance of Porous and Stone Mastic Asphalt Using Free Surface Energy Parameters

نویسندگان English

Mehdi Faraji 1
Hasan Taherkhani 2
1 Ph.D. Student, Civil Engineering Department, University of Zanjan, Zanjan, Iran.
2 Associate Professor, Civil Engineering Department, University of Zanjan, Zanjan, Iran.
چکیده English

Abstract: Moisture damage is one of the major distresses of asphalt pavements, which occurs due to de-bonding aggregate and asphalt binder at their interface due to moisture. One of the existing solutions for enhancing the resistance against moisture damage is using additives, known as anti-stripping additives. In this study, the effects of adding carbon black to an asphalt cement and porous asphalt and stone mastic asphalt (SMA) made by the modified binder have been investigated. 0, 4, 8, 12 and 16% (by the weight of asphalt) of carbon black has been added to the asphalt binder and the samples were subjected to penetration grade, softening point, ductility and Sessile drop test for determining the surface free energy components. The indirect tensile strength (ITS) in dry and wet condition of the mixtures were also measured and compared with the parameters determined from free surface energy method. Results show that penetration grade and ductility decreases up to 8% of carbon black and beyond that the trend reverses. Softening point increases up to 8% of carbon black and beyond that decreases with increase of carbon black content. Free surface energy components of asphalt show that the total surface free energy increases up to 8% and decreases beyond that level. The wet and dry indirect tensile strength of the porous asphalt and the wet indirect tensile strength of SMA mixture increases with increasing carbon black content up to 8%, and beyond that the trend reverses. The ratio of dry to wet ITS, known as tensile strength ratio (TSR), increase with increasing carbon black up to 8% and decreases after that. The effect of carbon black on porous asphalt is more significant than that on the SMA. Good correlation is found between the TSR results and the parameters obtained by surface free energy.

کلیدواژه‌ها English

Carbon black
asphalt binder
free surface energy
moisture damage
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