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Plastic Recycling in Asphalt Concrete Pavements: Preliminary Observations from Hawaii’s Pilot Project

2023 2 citations ? Citation count from OpenAlex, updated daily. May differ slightly from the publisher's own count. Score: 30 ? 0–100 AI score estimating relevance to the microplastics field. Papers below 30 are filtered from public browse.

Seyed Yashar Beheshti Shirazi, Seyed Yashar Beheshti Shirazi, Saroj Pathak, Saroj Pathak, Arthur Sickels, Arthur Sickels, Adrián Ricardo Archilla

Summary

This paper presents results from a Hawaii pilot project testing asphalt mixes containing recycled plastic waste, evaluating their pavement performance. Incorporating plastic waste into road surfaces permanently sequesters it, preventing these materials from fragmenting into microplastics in the environment.

Polymers

HDPE PE

This paper presents findings of testing performed to date from three field asphalt concrete mixes obtained from paving performed in November 2022 for a pilot project in Hawaii. The control mix meets Hawaii State IV mix requirements, with 20% reclaimed asphalt pavement (RAP) and polymer modified asphalt (PMA) binder PG64E-22. The other two mixes, which have the same gradation and RAP content, were prepared with 2 lb. per ton of NewRoad pellets consisting mostly of post-industrial high-density polyethylene (HDPE). One of these was prepared with PMA PG64E-22 and the other with neat binder, PG64-16. Testing results to date show benefits in rutting and expected results in dynamic modulus. They are inconclusive with regard to cracking because of high variability and inconsistencies in IDEAL-CT results without and with moisture sensitivity conditioning.

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