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Influence of the Gradation on Volumetrics, Workability, and Compactability of Bituminous Mixtures Modified with Recycled Polyethylene Plastic Waste
https://orcid.org/https://orcid.org/0000-0003-3458-5644
https://orcid.org/https://orcid.org/0009-0000-0215-1804
https://orcid.org/https://orcid.org/0000-0003-3915-8385
The use of low melting temperature plastic waste as a modifier for bituminous mixtures can have lots of benefits on thermomechanical performances, but the impacts are still difficult to predict reliably. The main challenge is to understand the shape that melted particles take during production and compaction and its direct consequences on the performances of the mix. The scope of this chapter is to evaluate the influence of a generally overlooked parameter of plastic-modified mixture: its mineral aggregate gradation.
Two hot mix designs, a dense-graded vs. an open-graded, with varying bitumen and recycled LDPE contents (up to 3% weight of mixture) are tested. Along with volumetrics, the compactability is evaluated with a Superpave Gyratory Compactor, while workability is measured with Nynas workabilimeter device.
The results on volumetrics suggest that LDPE particles can be considered as part of the aggregate with no absorption, while clearly acting as a binder between mineral aggregate particles. The open-graded mixes possessed millimetric-sized gap that favoured LDPE particle coalescence leading to clumping, poor workability, and extreme compactability. Dense-graded mix designs should generally be preferred regarding mix homogeneity, workability, and compactability. The best recommended mix design is a dense-graded mix with 0.5% reduced bitumen content and 1% added LDPE flakes. Overall, the influence of the mixture gradation on the way melted plastic particles behave is paramount.
Influence of the Gradation on Volumetrics, Workability, and Compactability of Bituminous Mixtures Modified with Recycled Polyethylene Plastic Waste
https://orcid.org/https://orcid.org/0000-0003-3458-5644
https://orcid.org/https://orcid.org/0009-0000-0215-1804
https://orcid.org/https://orcid.org/0000-0003-3915-8385
The use of low melting temperature plastic waste as a modifier for bituminous mixtures can have lots of benefits on thermomechanical performances, but the impacts are still difficult to predict reliably. The main challenge is to understand the shape that melted particles take during production and compaction and its direct consequences on the performances of the mix. The scope of this chapter is to evaluate the influence of a generally overlooked parameter of plastic-modified mixture: its mineral aggregate gradation.
Two hot mix designs, a dense-graded vs. an open-graded, with varying bitumen and recycled LDPE contents (up to 3% weight of mixture) are tested. Along with volumetrics, the compactability is evaluated with a Superpave Gyratory Compactor, while workability is measured with Nynas workabilimeter device.
The results on volumetrics suggest that LDPE particles can be considered as part of the aggregate with no absorption, while clearly acting as a binder between mineral aggregate particles. The open-graded mixes possessed millimetric-sized gap that favoured LDPE particle coalescence leading to clumping, poor workability, and extreme compactability. Dense-graded mix designs should generally be preferred regarding mix homogeneity, workability, and compactability. The best recommended mix design is a dense-graded mix with 0.5% reduced bitumen content and 1% added LDPE flakes. Overall, the influence of the mixture gradation on the way melted plastic particles behave is paramount.
Influence of the Gradation on Volumetrics, Workability, and Compactability of Bituminous Mixtures Modified with Recycled Polyethylene Plastic Waste
https://orcid.org/https://orcid.org/0000-0003-3458-5644
https://orcid.org/https://orcid.org/0009-0000-0215-1804
https://orcid.org/https://orcid.org/0000-0003-3915-8385
The use of low melting temperature plastic waste as a modifier for bituminous mixtures can have lots of benefits on thermomechanical performances, but the impacts are still difficult to predict reliably. The main challenge is to understand the shape that melted particles take during production and compaction and its direct consequences on the performances of the mix. The scope of this chapter is to evaluate the influence of a generally overlooked parameter of plastic-modified mixture: its mineral aggregate gradation.
Two hot mix designs, a dense-graded vs. an open-graded, with varying bitumen and recycled LDPE contents (up to 3% weight of mixture) are tested. Along with volumetrics, the compactability is evaluated with a Superpave Gyratory Compactor, while workability is measured with Nynas workabilimeter device.
The results on volumetrics suggest that LDPE particles can be considered as part of the aggregate with no absorption, while clearly acting as a binder between mineral aggregate particles. The open-graded mixes possessed millimetric-sized gap that favoured LDPE particle coalescence leading to clumping, poor workability, and extreme compactability. Dense-graded mix designs should generally be preferred regarding mix homogeneity, workability, and compactability. The best recommended mix design is a dense-graded mix with 0.5% reduced bitumen content and 1% added LDPE flakes. Overall, the influence of the mixture gradation on the way melted plastic particles behave is paramount.
Influence of the Gradation on Volumetrics, Workability, and Compactability of Bituminous Mixtures Modified with Recycled Polyethylene Plastic Waste
Carter, Alan (editor) / Vasconcelos, Kamilla (editor) / Dave, Eshan (editor) / Orozco, Gabriel (author) / Lassus, Clément (author) / Carter, Alan (author)
International Symposium on Asphalt Pavement & Environment ; 2024 ; Montreal, QC, Canada
14th International Conference on Asphalt Pavements ISAP2024 Montreal ; Chapter: 120 ; 729-734
2024-12-24
6 pages
Article/Chapter (Book)
Electronic Resource
English
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