material without the consent of the publisher is prohibited. Journal of Soil Contamination, 4(2): (1995) Chemical Aspects Of Cold-Mix Asphalt Incorporating Contaminated Soil

ABSTRACT: The chemical aspects associated with the incorporation of petroleum hydrocar-bons- and metals-affected soil has been studied extensively with respect to pavement properties, leaching behavior, sensitivities to moisture damage, and function group analysis. These studies provide information that can be used to evaluate the stability of these constituents in soils that have been incorporated as an ingredient in asphalt. These studies also indicate that cold-mix asphalt incorporating contaminated soil will be highly stable and perform adequately as an end product. Maximum chemical performance is achieved when the asphalt is comprised of high contents of pyridinic, phenolic, and ketone groups, which can be achieved by selectively choosing the source material. If the situation requires special stability or redundancy, small amounts of shale oil and lime can be used as additives. Situations and conditions that favor the presence of inorganic sulfur, monovalent salts, and high-strength solutions in the asphalt should be avoided because these conditions decrease the chemical stability of the asphalt cement by disrupting the functional group-aggregate bonds and by increasing the overall permeability. However, these conditions are not typically expected in the anticipated uses of asphalt cement to stabilize contaminants in soil using Environmentally Processed Asphalt ™ (EPA™) * or Asphaltic Metals Stabilization ™ (AMS™)* * remedial technologies. KEY WORDS: cold-mix asphalt, asphalt cement, EPATM, AMSTM