Highway engineers are interested in the basic engineering properties of soils because soils are used extensively in highway construction. Soil properties are of significant importance when a highway is to carry high traffic volumes with a large percentage of trucks. They are also of importance when high embankments are to be constructed and when the soil is to be strengthened and used as intermediate support for the highway pavement. Thus, several transportation agencies have developed detailed procedures for investigating soil materials used in highway construction. Soil Engineering for Highway Design Soil Engineering for Highway Design Soil Engineering for Highway Design Soil Engineering for Highway Design Soil Engineering for Highway Design Soil Engineering for Highway Design Soil Engineering for Highway Design Soil Engineering for Highway Design Soil Engineering for Highway Design Soil Engineering for Highway Design Soil Engineering for Highway Design Soil Engineering for Highway Design Soil Engineering for Highway Design Soil Engineering for Highway Design Soil Engineering for Highway Design Soil Engineering for Highway Design Soil Engineering for Highway Design Soil Engineering for Highway Design Soil Engineering for Highway Design Soil Engineering for Highway Design Soil Engineering for Highway Design Soil Engineering for Highway Design Soil Engineering for Highway Design Soil Engineering for Highway Design Soil Engineering for Highway Design Soil Engineering for Highway Design Soil Engineering for Highway Design Soil Engineering for Highway Design Soil Engineering for Highway Design Soil Engineering for Highway Design Soil Engineering for Highway Design Soil Engineering for Highway Design Soil Engineering for Highway Design Soil Engineering for Highway Design Soil Engineering for Highway Design Soil Engineering for Highway Design Soil Engineering for Highway Design Soil Engineering for Highway Design Soil Engineering for Highway Design Soil Engineering for Highway Design Soil Engineering for Highway Design Soil Engineering for Highway Design Soil Engineering for Highway Design Soil Engineering for Highway Design Soil Engineering for Highway Design Soil Engineering for Highway Design Soil Engineering for Highway Design Bituminous materials are used widely all over the world in highway construction.These hydrocarbons are found in natural deposits or are obtained as a product of the distillation of crude petroleum. The bituminous materials used in highway construction are either asphalts or tars. All bituminous materials consist primarily of bitumen and have strong adhesive properties with colors ranging from dark brown to black. They vary in consistency from liquid to solid; thus, they are divided into liquids, semisolids, and solids. The solid form is usually hard and brittle at normal temperatures but will flow when subjected to long, continuous loading. Bituminous Materials Bituminous Materials Bituminous Materials Bituminous Materials Bituminous Materials Bituminous Materials Bituminous Materials Bituminous Materials Bituminous Materials Bituminous Materials Bituminous Materials Bituminous Materials Bituminous Materials Bituminous Materials Bituminous Materials Bituminous Materials Bituminous Materials Bituminous Materials
