ABSTRACT
This chapter presents a discussion of types of bitumens, asphalt-aggregate chemistry, including important functional groups, and asphalt-aggregate stability. It discusses factors such as contaminant mobility, permeability, and leachability from asphalt, and other important factors to be considered, such as durability, aging, and biological resistance of the asphaltic end product. Bituminous substances are a class of native and pyrogenous substances containing or treated with bitumens or pyrobitumens, or substances of similar physical properties. Asphalt is a species of bitumen. Asphalt is a generic term for a dark brown to black cementitious material, solid or semisolid in consistency, in which the predominant constituents are bitumens that occur in nature as such or are obtained as residual materials in the refinery process. Asphaltic pyrobitumens are a species of pyrobitumen, are characterized by dark colored, comparatively hard and nonvolatile solids composed of hydrocarbons.
