Tarmacadam
Road surface of macadam, tar and sand / From Wikipedia, the free encyclopedia
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This article is about the road surfacing. For other uses, see Tarmac (disambiguation).
Tarmacadam is a road surfacing material made by combining tar and macadam (crushed stone and sand), patented by Welsh inventor Edgar Purnell Hooley in 1902. It is a more durable and dust-free enhancement of simple compacted stone macadam surfaces invented by Scottish engineer John Loudon McAdam in the early 19th century. The terms "tarmacadam" and tarmac are also used for a variety of other materials, including tar-grouted macadam, bituminous surface treatments and modern asphalt concrete.