Encyclopedia Article


The most common substance used in the U.S. for paving roads. Asphalt concrete (also called tarmac) is produced by laying heated refined crude oils over a layer of aggregate materials such as sand and gravel. The mixture is then rolled and pressed onto the road to create a solid, durable surface layer.

Photo Credit: 

 "Asphalt paving, October 22, 2008" by Pam Broviak is licensed under CC BY-SA.