ارزیابی اثر افزودنی دوگانه پودر لاستیک و PET به ‌صورت عددی و آزمایشگاهی در مخلوط آسفالتی گرم

نوع مقاله : مقاله پژوهشی

نویسندگان

1 فارغ التحصیل دانشگاه علم و صنعت عمران راه و ترابری

2 دماوند

3 گروه راه و ترابری، دانشکده عمران، دانشگاه علم و صنعت ایران، تهران، ایران

4 گروه سازه، دانشکده عمران، دانشگاه ملایر، ملایر، ایران

5 استادیار، گروه مهندسی عمران، دانشکده فنی و مهندسی، دانشگاه صنعتی قم، قم، ایران

چکیده

استفاده از دو ماده پلی‌اتیلن ترفتالات (PET) و پودر لاستیک (CR) به ‌صورت هم‌زمان در مخلوط‌های آسفالتی به دلیل بهره بردن هم‌زمان از خاصیت نرم شدگی پودر لاستیک و سخت شدگی پلی‌اتیلن ترفتالات، می‌تواند منجر به حذف این دو ماه از طبیعت و ساخت مخلوط آسفالتی مقاوم‌تر با بهره‌مندی حداکثری از دو افزودنی CR و PET گردد. بدین منظور، درصدهایی از دو افزودنی با مقادیر (0 و 100) %، (25 و 75) %، (50 و 50) %، (75 و 25) % و (100 و 0)% با هم ترکیب ‌شده و افزودنی را شکل داده­اند که در دو درصد 10 و 15 درصد وزنی قیر به مخلوط اضافه ‌شده‌اند، برای بررسی مخلوط­های اصلاح ‌شده، از آزمایش­های مدول برجهندگی، خزش دینامیکی، حساسیت رطوبتی و ITS استفاده شد. نتایج تحقیق نشان داده است که ماده‌ی معرفی‌ شده دارای مشخصات مطلوب بوده است، به‌ طوری ‌که استفاده از دو افزودنی به ازای 15% افزودنی دوگانه به قیر مصرفی، منجر به افزایش1/5 درصدی مدول برجهندگی و میزان خزش دینامیکی می‌گردد، همچنین مقدار کشش غیرمستقیم در حالت خشک به میزان 1/14 برابر نمونه شاهد می‌شود که مقدار افزودنی در این نمونه 25% پودر لاستیک و 75% پلی‌اتیلن ترفتالات می‌گردد. از طرفی برای آزمایش حساسیت رطوبتی، نمونه حاوی 10 درصد پودر لاستیک تنها باعث بهبود حدود 11 درصدی حساسیت رطوبتی مخلوط می­‌شود. در نهایت، از شیوه شبکه عصبی به ‌منظور برآورد نتایج آزمایشگاه استفاده ‌شده است و دقت مدل سنجیده شده است.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Evaluation of the dual additive effect of rubber powder and PET numerically and laboratory in Hot asphalt mixture

نویسندگان [English]

  • amirhossain ameri 1
  • Hamid Shaker 3
  • Faezeh jafari 4
  • Baitollah Badarloo 5
1 graduated from civil engineering department , Iran university of science and technology
3 Department of Civil Engineering, Iran University of Science and Technology, Tehran, Iran
4 Department of Civil Engineering, Malayer University, Malayer, Iran
5 Assistant professor in structural Eng., Department of Civil Engineering, Qom University of Technology (QUT), Qom, Iran
چکیده [English]

Utilizing Polyethylene Terephthalate (PET) and Crumb Rubber (CR) together in asphalt mixtures may result in the omission of these two materials from the environment and the formation of more resilient asphalt, enjoying the simultaneous softening quality of crumb rubber (CR) and hardening quality of polyethylene terephthalate (PET). Therefore, the two additives were combined in (0 and 100) %, (25 and 75) %, (50 and 50) %, (75 and 25) %, and (100 and 0) %, and the mixture was formed. Two additives were added to the mixture in 10% and 15% by weight of bitumen. Resilient Modulus Testing, Dynamic Creep Test, Moisture Sensitivity, and ITS Method were used to assess the modified mixture. Results revealed that the recommended material had the desired characteristics so that the use of every 15% Dual-use Additives of Crumb Rubber (CR) and Polyethylene Terephthalate (PET) to bitumen used leads to a 1.5% increase in Resilient Modulus and Dynamic Creep. Moreover, Indirect Tension in the dry state will be 1.14 times of the control sample (Crumb Rubber (CR): 25% and Polyethylene Terephthalate (PET): 75%). For the Moisture sensitivity test, the sample including 10 % of Crumb Rubber (CR) alone can cause an increase in the moisture sensitivity by 11%. Finally, the neural network method is used to estimate the lab results and evaluate the model's accuracy.

کلیدواژه‌ها [English]

  • Crumb Rubber (CR)
  • Polyethylene Terephthalate (PET)
  • Asphalt Mixture
  • Neural Network
  • Experimental Data Analysis
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