Asphalt-base oil is sometimes referred to as bitumen or asphaltic bitumen. It is a black, sticky substance that is used in the production of asphalt for road building and other construction projects. Other synonyms for asphalt-base oil include asphalt cement, asphaltum, and tar. Bituminous coal can also be used as a source for this material. In addition, some people call it just plain asphalt. Whatever you call it, this material is an important component in many construction projects, and it is crucial to use the right type of material for each particular application to ensure that the final product is both durable and reliable.