Influence of Tensile Load on Bonding Strength of Asphalt Concrete Containing Modified Buton Asphalt and Polyethylene Terephthalate Waste: A Case Study of Indonesian Roads

The natural bitumen coalesced with the sediment in Buton Island, Indonesia, is known as Buton rock asphalt (BRA). Modified Buton Asphalt (MBA) is one of the latest bitumen processing that extracted bitumen from BRA and furtherly mixed with petroleum bitumen. In Indonesia drinking bottle is made by used extensively the polyethylene terephthalate (PET) for domestic consumption. This research used PET waste of 0.5% to 2.5% of the total weight of aggregates and filler, while MBA was the main binder to produce AC-WC mixture. One mixture without PET waste and five mixtures containing PET waste of 0.5%, 1.0%, 1.5%, 2.0% and 2.5% were produced to determine the compatibility of PET with MBA related to the bonding strength of the AC-WC mixture. Indirect tensile strength test equipped with deformation measurement devices was carried out with the aim to understand the bonding strength related to the vertical stress-strain relationship, peak tensile stress, Modulus of elasticity in tension and
toughness index of each mixture. The test results showed that MBA was compatible with blending with PET waste in producing compacted specimens. The results of quantitative observations showed that the presence of PET waste made the mixtures better than the mixture without PET in terms of stiffness and elastic region. The peak tensile stress of mixture increased by 45.2% to 96.8% with PET waste compared to the mixture without PET. The mixture containing PET waste was 56.09% to 157.18% higher than the mixture without PET in terms of Et. Toughness index (TI) increased with the use of PET waste up to 2.0%, but was smaller at 2.5% PET waste compared to the mixture without PET waste.