KARAKTERISTIK MARSHALL CAMPURAN HOT ROLLED SHEET WEARING COURSE MENGGUNAKAN BAHAN TAMBAH PLASTIK BEKAS JENIS POLYETHYLENE TEREPHTHALATE

This study was conducted to determine the benefits of the use of polyethylene terephthalate used plastic as additives in hot asphalt mixture Hot Rolled Sheet Wearing Course. Marshall testing was carried out on specimens using polyethylene terephthalate plastic additives, with variations in the ingredients added 2%, 4%, 6%, 8%, and 10% to the weight of asphalt on specimens with Optimum Asphalt Content. Marshall parameters of test specimens generally meet the existing specifications, except the Void In Mixture value for specimens with plastic content of 8% and 10%. The optimum plastic content obtained from this study is 7.80%. Keywords: asphalt mixture, hot rolled sheet, Marshall parameters, polyethylene terephthalate Abstrak Studi ini dilakukan untuk mengetahui manfaat penggunaan plastik bekas jenis Polyethylene Terephthalate sebagai bahan tambah pada campuran beraspal panas jenis Hot Rolled Sheet Wearing Course. Pengujian Marshall dilakukan terhadap benda-benda uji yang menggunakan bahan tambah plastik jenis Polyethylene Terephthalate, dengan variasi bahan tambah 2%, 4%, 6%, 8%, dan 10% terhadap berat aspal pada benda uji dengan Kadar Aspal Optimum. Parameter Marshall benda-benda uji umumnya memenuhi spesifikasi yang ada, kecuali nilai Void In Mixture untuk benda-benda uji dengan kadar plastik 8% dan 10%. Kadar plastik optimum yang diperoleh dari studi ini adalah 7,80%. Kata-kata kunci: campuran beraspal, hot rolled sheet, parameter Marshall, polyethylene terephthalate

Deposition and Characterization of C-NbN/NbCN Multilayers on Si(100) Substrates

The cubic-NbN/NbCN multilayers with modulation periodicity (Λ) ranging from 4.2 to 39.1 nm were deposited on Si (100) substrate by reactive magnetron sputtering in a mixture of Ar and N2 gases. The Λ dependent structural, mechanical and tribological properties for resulting c-NbN/NbCN multilayers were explored. As Λ varied from 4.2 to 39.1 nm, all the films exhibited an obvious modulated structure. Increasing the Λ, the Nb (C,N)(111) peak in XRD gradually shifted to bigger angles and the peak intensity of NbN(111) became stronger. The stress for all multilayers was compressive ranging in between the stress for both NbN and NbCN single layers, and the stress value was stable with increasing Λ. The NbN layer was beneficial to relaxing the compressive stress which induced by NbCN layer. In addition, as Λ increases, the hardness (H) first increased, and then decreased after reaching a maximum value. The obvious enhancement in hardness for multilayers was observed, whose maximum value approaches 43.3 GPa when Λ = 8.4 nm, 37% larger than that obtained by the rule of mixture value. The friction coefficient values of NbN/NbCNmultilayers ranging between 0.34 and 0.4 were much lower than that of NbN monolayer but higher than that of NbCN monolayer were.