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"Konsumsi plastik yang terus meningkat di Indonesia menimbulkan masalah limbah signifikan, termasuk limbah plastik multilayer yang sulit didaur ulang karena sifat hidrofobik dan perbedaan suhu leleh antar lapisannya. Penelitian ini memanfaatkan limbah plastik multilayer Non Metallized Polypropylene (PP) dari bungkus mie instan dan Metallized Polyethylene Terephthalate (M-PET) dari bungkus kopi sebagai bahan modifikasi aspal melalui metode dry mixing. Perlakuan plasma dingin pada 90 detik secara optimal menurunkan sudut kontak air pada PP (dari 85° menjadi 44,62) dan PET (dari 68,7 menjadi 53,96), mengonfirmasi peningkatan sifat hidrofilik. Analisis FTIR mengidentifikasi pembentukan gugus hidroksil (-OH) dan ikatan C-O pada permukaan PP, serta gugus C=O dan C-O pada PET. Analisis DSC menunjukkan penurunan titik leleh setelah perlakuan (PP turun 5,5C, PET turun 3C). XPS mengonfirmasi peningkatan proporsi gugus fungsional mengandung oksigen pada permukaan plastik. Pengujian moisture absorption pada Polymer Coated Aggregate (PCA) menunjukkan penurunan penyerapan air pada PP (dari 5,44% menjadi 3,55% pada 7,5% PP) namun peningkatan drastis pada PET (dari 5,44% menjadi 19,57% pada 2,5% M-PET). Pengujian Marshall menunjukkan peningkatan stabilitas dan Marshall Quotient pada PP dan M-PET yang diberi perlakuan plasma, sekaligus memberikan kekakuan lebih baik pada campuran aspal.

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The increasing plastic consumption in Indonesia poses a significant waste problem, particularly with multilayer plastic waste which is difficult to recycle due to its hydrophobic nature and varying melting temperatures between layers. This study addresses this challenge by utilizing Non Metallized Polypropylene (PP) plastic waste from noodle packaging and Metallized Polyethylene Terephthalate (M-PET) plastic waste from coffee packaging as asphalt modifiers via the Dry Mixing method. Sessile Drop Test results demonstrate that cold plasma treatment for 90 seconds optimally reduced the water contact angle on PP (from 85° to 44,62°) and PET (from 68,7° to 53,96°), confirming enhanced hydrophilic properties. FTIR analysis identified the formation of hydroxyl (-OH) groups and C-O bonds on the PP surface, as well as C=O and C-O groups on PET, supporting surface functionalization. DSC analysis revealed a decrease in melting temperatures for both plastics after treatment (PP decreased by 5.5°C, PET by 3°C), indicating partial surface oxidation. XPS analysis further confirmed an increased proportion of oxygen-containing functional groups (C-O-C, C=O, C-O) on the plastic surfaces after plasma treatment. Moisture absorption tests on Polymer Coated Aggregate (PCA) showed a decrease in water absorption for PP (from 5,44% to 3,55% at 7,5% PP) but a drastic increase for PET (from 5,44% to 19,57% at 2,5% PET). Marshall tests indicated improved stability and Marshall Quotient for both plasma-treated PP and M-PET, providing better stiffness to the asphalt mixture."