ASPHALT

Asphalt (/ˈæsˌfɔːlt, -ˌfɑːlt/), also known as bitumen (UK English: /ˈbɪtʃəmən, ˈbɪtjʊmən/,^[1] US English: /bɪˈt(j)uːmən, baɪˈt(j)uːmən/)^[2] is a sticky, black, and highly viscous liquid or semi-solid form of petroleum. It may be found in natural deposits or may be a refined product, and is classed as a pitch. Before the 20th century, the term asphaltum was also used.^[3] The word is derived from the Ancient Greek ἄσφαλτος ásphaltos.^[4]

The primary use (70%) of asphalt is in road construction, where it is used as the glue or binder mixed with aggregate particles to create asphalt concrete. Its other main uses are for bituminous waterproofing products, including production of roofing felt and for sealing flat roofs.^[5]

The terms "asphalt" and "bitumen" are often used interchangeably to mean both natural and manufactured forms of the substance. In American English, "asphalt" (or "asphalt cement") is commonly used for a refined residue from the distillation process of selected crude oils. Outside the United States, the product is often called "bitumen", and geologists worldwide often prefer the term for the naturally occurring variety. Common colloquial usage often refers to various forms of asphalt as "tar", as in the name of the La Brea Tar Pits.

Naturally occurring asphalt is sometimes specified by the term "crude bitumen". Its viscosity is similar to that of cold molasses^[6][7] while the material obtained from the fractional distillation of crude oil boiling at 525 °C (977 °F) is sometimes referred to as "refined bitumen". The Canadian province of Alberta has most of the world's reserves of natural asphalt in the Athabasca oil sands, which cover 142,000 square kilometres (55,000 sq mi), an area larger than England.^[8]

https://en.wikipedia.org/wiki/Asphalt

People also ask

What is the mixture of asphalt?
Hot Mix Asphalt (HMA) is a combination of approximately 95% stone, sand, or gravel bound together by asphalt cement, a product of crude oil. Asphalt cement is heated aggregate, combined, and mixed with the aggregate at an HMA facility.

What is the main use of asphalt?
The primary use (70%) of asphalt is in road construction, where it is used as the glue or binder mixed with aggregate particles to create asphalt concrete. Its other main uses are for bituminous waterproofing products, including production of roofing felt and for sealing flat roofs.

How long do you have to stay off a new asphalt driveway?
 How long should vehicles stay off the newly paved surface? A: Most driveways or parking lots are blocked off for 2 to 3 days. However, if necessary, asphalt can be driven on but it is not recommended that vehicles park on the asphalt.

What is asphalt and bitumen?
Bitumen is a black or dark-colored (solid, semi-solid, viscous), amorphous, cementitious material that can be found in different forms, such us rock asphalt, natural bitumen, tar and bitumen derived from oil, which is referred to as petroleumbitumen. Currently most of the roads globally are paved with bitumen.

Is there a difference between asphalt and bitumen?
Asphalt and bitumen are often thought of as being one and the same thinghowever asphalt is quite different because it is a mixture of bitumen and fillers such as sand, grit and stone particles. It is commonly used in the construction of road surfaces.

Is asphalt toxic?
Coal tar is known to cause cancer in humans, as well as genetic mutations in lab animals. One of the new studies helps quantify that risk. ... Researchers still would like to know how much of a toxic dose those same kids are getting when they play outside in yards next to coal tar-sealed asphalt, or on the asphalt itself.