Emissions of tar-containing binders: a laboratory study.
In Switzerland, hot recycling of tar-containing pavements is a subject of much dispute between environmentalists, road authorities and constructors. The main reason for this controversy comes from a lack of knowledge about the amount of hazardous compounds emitted, especially polycyclic aromatic hydrocarbons (PAHs), and the resulting health risk for road workers. On this background we decided to initiate a research project to study the emission behaviour of tar-containing materials. Mixtures of tar and bitumen with variable PAH content were heated in an open reactor flask at different temperatures to identify and quantify the key parameters of PAH emissions. The expected linear correlation between PAH concentration in the fumes and in the binder was found only for binder mixtures with PAH concentrations above 5000 ppm. This was traced back to the problem that a change of the PAH content in the binder was always accompanied by a change of other parameters, like viscosity. In the experiments with temperature variation, emissions of individual PAHs correlated well with vapor pressure. However, for Naphthalene and, in a lesser degree, for 3-ring PAHs too, a partial depletion of these compounds in the vapour was observed in some experiments. The effect is a slower increase with temperature for these compounds compared to 4-6-ring PAHs. This is one reason why the commonly used set of EPA-PAHs, which includes naphthalene and 3-ring PAHs, is considered inappropriate for the assessment of the health hazard in the case of tar-containing materials in hot recycling.
Hugener
Martin
M
Laboratory for Road Engineering/Sealing Components, EMPA, Swiss Federal Laboratories for Materials Testing and Research, Duebendorf, Switzerland. martin.hugener@empa.ch
Emmenegger
Lukas
L
Mattrel
Peter
P
D000395:Air Pollutants, Occupational / Q000032:analysis*; D003247:Conservation of Natural Resources; D003252:Construction Materials; D006358:Hot Temperature; D006838:Hydrocarbons / Q000032:analysis* / Q000737:chemistry; D011084:Polycyclic Aromatic Hydrocarbons / Q000032:analysis*; D013638:Tars / Q000032:analysis* / Q000737:chemistry
D000395:Air Pollutants, Occupational; D006838:Hydrocarbons; D011084:Polycyclic Aromatic Hydrocarbons; D013638:Tars; C006647:asphalt