Abstract
In recent years, Chile’s vehicle fleet has undergone great changes, with 25% growth in motor vehicles. This increase is directly related to improvements in the performance of flexible pavements, which make infrastructure less susceptible to permanent deformations and/or cracking at high and low temperatures, respectively. In 2016, the Ministry of the Environment passed the Law on Recycling and Accountability to promote the search for innovative ideas and materials in different sectors. This research focused on the experimental study of the mechanical behaviour of a mixture of hot asphalt, incorporating thick particles of polyethylene terephthalate (PET) from bottle recycling, using the Marshall stability and flow test and the resilience module (rigidity) test at 5°C and 22°C. Based on previous research, significant PET fibre sizes were used, increasing the optimum amount of polyethylene terephthalate from 6% to 14% in the mixture. The results show that incorporating this polymeric additive provides greater stability, in addition to an increase in resistance to permanent deformations and fatigue, compared to a “traditional” mixture.
Highlights
Durability is a crucial factor when designing a road, as it is necessary to ensure that the layers of pavement maintain desired properties [1]
Results and Discussion e Marshall stability and flow test involved the optimal percentage of the asphalt binder for the granulometric band IV-A-12 obtained in previous investigations [13], which was 5.3% per weight of the aggregate
Marshall flow when reaching the maximum load before the lapse, gives a reference of the vertical distortion of the sample when reaching its lapsing state. e results show that the flow increases along with the samples’ polyethylene terephthalate (PET) content, even when all samples contained the same percentage of the asphalt binder. e increase in flow, associated with the presence of PETparticles, creates a more flexible mix
Summary
Durability is a crucial factor when designing a road, as it is necessary to ensure that the layers of pavement maintain desired properties [1]. Flexible pavement can be created by modifying asphalt binder, which can be done during the fabrication process by considering the origins and processing of petroleum. Both methods are difficult [2]. A third option focuses on modifying the asphalt binder using additives in the mixture to significantly improve the performance of the pavement. Recycled plastic can be used to increase the durability of the pavement [3, 4]
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