Bitumen

Bitumen is a viscous liquid or semi-solid form of petroleum consisting of hydrocarbons and their derivatives. It is obtained by refinery processes from petroleum or found as a natural deposit. It is usually available in dark colors ranging from brown to black. The main purpose of bitumen in flexible pavements is to strongly bind and hold the other pavement components together and provide a smooth and leveled surface for moving vehicles in road construction. Current world use of bitumen is approximately 100 million tonnes per year. About 85% of all bitumen produced (grade 60/70) is used as a binder in asphalt for road construction. A further 10% is used in roofing applications and remaining 5% is used for sealing and insulating purposes.