Leaching of Pollutants from Reclaimed Asphalt Pavement

ABSTRACT The construction and expansion of asphalt roadways results in the production of a large amount of milled asphalt also known as reclaimed asphalt pavement (RAP). A major fraction of this RAP is recycled by incorporation into a new asphalt mixture. At times, however, a large amount of this material may require other forms of management. One proposed alternative for the management of RAP is use as fill material. A limitation to using RAP as fill material stems from unknown risks of pollutants leaching from the waste to the environment. Research was conducted to address some of the environmental concerns related to the possible leaching of pollutants from RAP. Six samples of RAP was collected from asphalt plants throughout Florida. A series of leaching tests were performed at both batch-scale and in leaching columns. The primary chemicals investigated were volatile organic compounds (VOCs), polycyclic aromatic hydrocarbons (PAHs), and heavy metals. Results from the Toxicity Characteristic and the Syn...