Amirkabir University of Technology Amirkabir Journal of Civil Engineering 2588-297X 54 1 2022 03 21 Evaluation of the dual additive effect of rubber powder and PET numerically and laboratory in Hot asphalt mixture Evaluation of the dual additive effect of rubber powder and PET numerically and laboratory in Hot asphalt mixture 209 228 4394 10.22060/ceej.2021.18530.6887 FA Amirhossain Ameri graduated from civil engineering department , Iran university of science and technology M. Ameri 0000-0002-6098-1037 Hamid Shaker Department of Civil Engineering, Iran University of Science and Technology, Tehran, Iran 0000-0002-8524-1676 Faezeh Jafari Department of Civil Engineering, Malayer University, Malayer, Iran Baitollah Badarloo Assistant professor in structural Eng., Department of Civil Engineering, Qom University of Technology (QUT), Qom, Iran Journal Article 2020 06 02 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. 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.

https://ceej.aut.ac.ir/article_4394_096d3a817a272647f4ada2d6d733a8fb.pdf