Asphalt has a number of names: asphalt, bitumen, tarmac and pitch are a few of the common ones. Other than name, they are all one and the same thing: a sticky, black and highly viscous semi-solid form of petroleum. It starts off as a naturally occurring deposit and then gets refined and processed to give us the product we use to lay asphalt surfaces. Raw asphalt needs to be heated in order to combine it with aggregates (gravel, sand and stone) to make it suitable for road and paving use.
26 September 2013