Bituminous binders, commonly referred to as asphalt binders or simply asphalt, are a group of sticky, viscous, black, or dark-colored cementitious materials that are primarily composed of highly condensed polycyclic aromatic hydrocarbons. These substances occur both in natural deposits and as a byproduct of the petroleum refining process.

Bituminous binders are used predominantly in the construction and maintenance of road surfaces. They act as a glue to cohere aggregates—such as sand and gravel—into a durable paving material. The quality of a bituminous binder is essential for the performance of the asphalt pavement, particularly its durability, resistance to deformation, and ability to withstand various weather conditions.

The physical properties of bituminous binders—such as viscosity, softening point, and elastic recovery—are tailored for specific applications and climates by refining their composition. They may be modified with additives to enhance certain performance characteristics such as improved temperature susceptibility, elasticity, and aging resistance.

For more information on bituminous binders, you can visit the following websites:

1. The Asphalt Institute: The Asphalt Institute is a U.S.-based association of international petroleum asphalt producers, manufacturers, and affiliated businesses. It provides a wealth of information on bituminous binders, including engineering technical support, research, and educational material.
Website: (https://www.asphaltinstitute.org/)

2. Federal Highway Administration (FHWA): The FHWA provides research and resources related to transportation engineering, including information on materials used in road construction such as bituminous binders. The FHWA’s website offers publications, guidelines, and updates on the latest research in the field of asphalt pavement technology.
Website: (https://www.fhwa.dot.gov/pavement/asphalt/)