01763723

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https://annualmeeting.myt...nlineProgram/Details/15644

The use of recycled plastic as an extender and modifier of bituminous binder in asphalt mixtures has attracted significant attention in recent times, including the development of commercially available products intended to be either elastomeric and plastomeric in nature. Although the improvement in mechanical properties associated with these products has been demonstrated, a range of practical and logistical issues require further attention, including whether the products should be wet-mixed into the bitumen or dry-mixed by direct addition to the asphalt production plant. Comparison of wet-mixed and dry-mixed binder and mixture results confirmed a significant improvement in most properties, except for fatigue life, which was not significantly affected by recycled plastic modification. Furthermore, the binder and mixture results were generally not statistically different for the wet-mixing and dry-mixing processes. However, the wet-mixing process was associated with higher test result variability, although the sample sizes are too small for this to be considered conclusive. It was concluded that the decision to wet-mix or dry-mix the evaluated recycled plastic products into asphalt mixtures should be based on factors other than the resulting binder or mixture properties, because the results were generally not significantly affected by the mixing process.

This paper was sponsored by TRB committee AKM10 Standing Committee on Production and Use of Asphalt.

TRBAM-21-00317

English

22p

2021

Transportation Research Board 100th Annual Meeting

Digital/other

Figures; References; Tables

Asphalt mixtures; Bituminous binders; Mechanical properties; Mixing; Plastics; Recycled materials

Construction; Highways; Materials; Pavements

Transportation Research Board Annual Meeting 2021 Paper #TRBAM-21-00317

TRIS, TRB, ATRI

Dec 23 2020 11:09AM