Release of PAHs from reclaimed asphalt mixtures into the water environment after passivation by cold in-place recycling technology

• DOI: 10.1007/s11356-024-35875-2
• Publication Date: 2025-01-10T22:03:14Z
• Authors: Vilma Jandová; Martina Bucková; Jiří Huzlík; Jan Valentin; Karel Effenberger; Josef Svoboda
• Keywords: Asphalt pavement; Passivation

Abstract The paper deals with an analysis of the amount 16 polycyclic aromatic hydrocarbons (PAHs (Polycyclic hydrocarbons—16 defined by US EPA.)) released from reclaimed asphalt mixtures used in base layers road surfaces and binder construction using cold in-place recycling. For ten samples tested, sum PAHs was determined directly for crushed mixture its 24-h leachate. were to make cylindrical specimens recycling mixture. prepared simulate as realistically possible use reconstructions implementing technology, which should ensure passivation PAHs. subjected a dynamic leaching test under laboratory conditions regular replacement liquid. results showed that concentration into water environment (passivated material) approximately 40–50% lower than test. When compared input PAH concentrations (36–1323 mg.kg −1 ), on average, only 0.15% is passivated material. Dynamic has shown wrapping original new subsequent compaction leads preservation material at such level their total are reduced two orders magnitude.