Asphalt

thumb|Natural bitumen from the Dead Sea thumb|Refined bitumen thumb|upright|The University of Queensland [[pitch drop experiment, demonstrating the viscosity of bitumen]]

material used for paving roads

thumb|An illustration of the first macadamized road in the United States between Boonsboro, Maryland|Boonsboro and Hagerstown in [[Maryland in 1823; in the foreground, workers are breaking stones "so as not to exceed in weight or to pass a ring".]] Macadam is a type of road construction pioneered by Scottish engineer John Loudon McAdam , in which crushed stone is placed in shallow, convex layers and compacted thoroughly. A binding layer of stone dust (crushed stone from the original material) may form; it may also, after rolling, be covered with a cement or bituminous binder to keep dust and s

long-term experiment which measures the flow of a piece of pitch

Asphaltenes are molecular substances that are found in crude oil, along with resins, aromatic hydrocarbons, and saturates (i.e. saturated hydrocarbons such as alkanes). The word "asphaltene" was coined by Jean-Baptiste Boussingault in 1837 when he noticed that the distillation residue of some bitumens had asphalt-like properties. Asphaltenes in the form of asphalt or bitumen products from oil refineries are used as paving materials on roads, shingles for roofs, and waterproof coatings on building foundations.thumb|An example of possible structure for an asphaltene molecule.

plant used for the manufacture of asphalt, macadam and other forms of coated roadstone

thumb|right|alt=A smooth tarmac road with a roller engine in action Tarmacadam (a portmanteau of "tar" and "macadam") or tarmac is a concrete 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 mo

pavement material

thumb|Asphaltite from the Uinta Formation, Bonanza, Utah|Bonanza, [[Utah]] thumb|Asphaltite pahoehoe paralava. This remarkable specimen is from asphaltite which was melted in a wildfire in 2012. While molten, it developed a smooth to ropey top surface much like pahoehoe basalt lava. Exhibit at the [[Utah Field House of Natural History.]] Asphaltite (also known as uintahite, asphaltum, gilsonite or oil sands) is a naturally occurring soluble solid hydrocarbon, a form of asphalt (or bitumen) with a relatively high melting temperature. Its large-scale production occurs in the Uinta Basin of Utah

type of asphalt

research project

asphalt road hazard