Often referred to as Bitumen, Asphalt purchased commercially usually derives from petroleum.
It is most commonly an ingredient in asphalt-based concretes that are typically used to surface roads or pathways.
The Concrete is traditionally 5% asphalt and 95% aggregate.
The aggregates used are most likely to be sand, stone or gravel. Asphalt is highly viscous, meaning that it has a sticky consistency that is in between a liquid and a solid. This means that it needs to be heated up before aggregates can be added.