پژوهشنامه حمل و نقل

پژوهشنامه حمل و نقل

ارزیابی سختی، مقاومت در برابر شیارشدگی و حساسیت رطوبتی مخلوط های آسفالتی حاوی پودرلاستیک و ساسوبیت

نوع مقاله : مقاله پژوهشی

نویسندگان
محمد کوهی 1
شاهین شعبانی 2
ابوالفضل باقرنیا 3
1 دانش آموخته کارشناسی ارشد، دانشکده مهندسی عمران‌، دانشگاه پیام نور، تهران، ایران
2 دانشیار، گروه مهندسی عمران، دانشگاه پیام نور، تهران، ایران
3 دانش آموخته کارشناسی ارشد، دانشکده مهندسی عمران‌، واحد علوم و تحقیقات، دانشگاه آزاداسلامی، تهران، ایران
10.22034/tri.2025.513877.3328
چکیده
یکی از راه‌حل‌های مهندسی برای کاهش میزان ضایعات لاستیکی، استفاده از پودرلاستیک در ساخت مخلوط‌های آسفالتی و بهبود عملکرد آنها است. با این حال دمای زیاد اختلاط پودرلاستیک و آسفالت نیازمند استفاده از راه‌حل‌هایی است که بتواند همزمان سبب کاهش انرژی لازم برای اختلاط و بهبود عملکرد آسفالت لاستیکی شود. یکی از راه‌حل‌هایی که پژوهشگران در سال‌های اخیر به آن پرداخته‌اند، استفاده از مخلوط آسفالت گرم (WMA) است که دمای اختلاط 10 تا 30 درجه کمتر از مخلوط آسفالت داغ (HMA) نیازد دارد. از جمله موادی که می‌تواند دمای اختلاط آسفالت لاستیکی را کاهش دهد، ساسوبیت است. اگرچه پژوهشگران مخلوط‌های آسفالتی حاوی پودرلاستیک و ساسوبیت را مورد بررسی قرار داده اند، با این حال به صورت ویژه حساسیت رطوبتی این نوع مخلوط بررسی نشده است. بدین منظور پژوهش حاضر برای بررسی حساسیت رطوبتی مخلوط آسفالتی حاوی پودرلاستیک و ساسوبیت از دو مقدار 8 و 16 درصد پودرلاستیک و 1، 2 و 3 درصد ساسوبیت استفاده نموده است. در طرح اختلاط نمونه‌ها از دو دمای 150 و 130 درجه استفاده شده تا تفاوت بین مخلوط گرم و داغ مشاهده شود. بر روی نمونه‌ها، آزمایش‌های استحکام و روانی مارشال، مدول برجهندگی، خزش دینامیکی و حساسیت رطوبتی (کشش غیرمستقیم، نسبت مقاومت فشاری اشباع به مقاومت فشاری خشک و جوشان تگزاس) انجام شده است. نتایج نشان می‌دهد که از تکنولوژی آسفالت گرم می توان در آسفالت‌های لاستیکی استفاده نمود، اما با توجه به افزایش حساسیت رطوبتی مخلوط با افزایش درصد پودرلاستیک در دمای اختلاط پایین‌تر، نباید از درصد پودرلاستیک بالایی استفاده شود. با توجه به نتایج، در مخلوط‌های آسفالت لاستیکی حاوی 8 و ۱6 درصد پودرلاستیک می‌توان با اضافه کردن ۳ درصد ساسوبیت دمای اختلاط را به 150 درجه کاهش داد اما کاهش دما به ۱۳۰ درجه به دلیل اینکه تأثیر شدیدی بر حساسیت رطوبتی دارد توصیه نمی‌شود.
کلیدواژه‌ها
مخلوط آسفالتی
پودرلاستیک
ساسوبیت
حساسیت رطوبتی

موضوعات

عنوان مقاله English

Evaluation of Hardness, Rutting Resistance, and Moisture Sensitivity of Asphalt Mixtures Containing Rubber Powder and Sasobit

نویسندگان English

Mohammad Koohi 1
Shahin Shabani 2
Abualfazl Baghernia 3
1 M.Sc., Grad., Department of Civil Engineering, Payame Noor University (PNU), Tehran, Iran.
2 Associate Professor, Department of Civil Engineering‌, Payame Noor University (PNU), Tehran, Iran.
3 M.Sc., Grad., Department of Civil Engineering, SR.C., Islamic Azad University, Tehran, Iran.
چکیده English

One engineering solution to reduce the amount of rubber waste is the use of rubber powder in the production of asphalt mixtures to enhance their performance. However, the high mixing temperature of rubber powder and asphalt necessitates the implementation of solutions that can simultaneously reduce the energy required for mixing and improve the performance of rubberized asphalt. One approach that researchers have explored in recent years is the use of Warm Mix Asphalt (WMA), which requires mixing temperatures that are 10 to 30 degrees lower than those of Hot Mix Asphalt (HMA). Among the materials that can lower the mixing temperature of rubberized asphalt is Sasobit. Although researchers have examined asphalt mixtures containing rubber powder and Sasobit, the moisture sensitivity of this type of mixture has not been specifically investigated. This study aims to assess the moisture sensitivity of asphalt mixtures containing rubber powder and Sasobit using two amounts of 8% and 16% rubber powder and 1%, 2%, and 3% Sasobit. Two mixing temperatures of 150 and 130 degrees Celsius were employed to observe the differences between warm and hot mixtures. The samples underwent Marshall stability and flow tests, resilient modulus, dynamic creep, and moisture sensitivity tests (indirect tensile strength, saturated to dry compressive strength ratio, and Texas boiling test). The results indicate that Warm Mix Asphalt technology can be utilized in rubberized asphalts; however, due to the increased moisture sensitivity of the mixture with higher percentages of rubber powder at lower mixing temperatures, high percentages of rubber powder should be avoided. According to the findings, in rubberized asphalt mixtures containing 8% and 16% rubber powder, the mixing temperature can be reduced to 150 degrees Celsius by adding 3% Sasobit, but lowering the temperature to 130 degrees is not recommended due to its significant impact on moisture sensitivity.

کلیدواژه‌ها English

Asphalt Mixture
Rubber Powder
Sasobit
Moisture Sensitivity
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