Laboratory eva‎luation of Properties of Asphalt Mixture Containing Reclaimed Asphalt Pavement (RAP) and Recycled Waste Polyethylene Terephthalate (PET)

9/19/2024 12:00:00 AM

Asphalt pavements suffer various failures during their service life due to the increasing load and traffic volume in recent years as well as environmental factors. The major and main failures of asphalt pavements, which account for a large part of road maintenance costs annually, are rutting, cracking, and moisture failure. Today, all over the world, various methods have been adopted to improve and increase the resistance against rutting, cracking and moisture sensitivity of asphalt pavement. These methods include the use of additives and modifiers, the use of recycled asphalt pavement, and other such cases. This research aims to investigate the characteristics of asphalt mixtures containing reclaimed asphalt pavement (RAP) and additives obtained from the chemical recycling of polyethylene terephthalate (PET), the effect of these materials in achieving a resistant, sustainable, eco-friendly, and cost-effective pavement, has been done. For this purpose, after the chemical recycling of PET waste plastics, the resulting material was added to bitumen in different proportions (1,2 and 3%). In addition, RAP was also added to the mixture with ratios of 25 and 50% by weight. After that, by making asphalt mixtures specimens and performing various mechanical tests, the performance of mixtures containing RAP and recycled PET was eva‎luated. Dynamic creep, indirect tensile strength, and semi-circular bending (SCB) tests were conducted to eva‎luate the resistance to rutting, resistance to moisture damage, and resistance to cracking at low temperatures. The obtained results have shown the improvement of resistance against rutting, cracking, and moisture suseptability with the addition of recycled PET and RAP additives separately and together. Also, the most cost-effective possible mixture was determined with a cost-benefit analysis. Asa result, being the TOPSIS multi-attribute decision-making method (MADM) along with the CRITIC weighting method, the mixtures were classified and identified based on resistance criteria and construction cost based on one kilometer of pavement.

پلي‌اتيلن‌ترفتالات (PET) , بازيافت شيميايي , عملكرد مكانيكي , آناليز سود ـ هزينه , تصميم‌گيري چندشاخصه (MADM) , روش تاپسيس

Polyethylene Terephthalate (PET) , Chemical recycling , Mechanical performance , Cost-benefit analysis , multi-attribute decision-making method (MADM) , TOPSIS

Sajed Baradaran

Dr. Mahmood Ameri