タイトルまたは説明
Asphalt, also known as bitumen, 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; it is a substance
classed as a pitch. Until the *0th century, the term asphaltum was
also used.[1]
The primary use of asphalt/bitumen 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.
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 the carefully
refined residue from the distillation process of selected crude
oils. Outside the United States, the product is often called
bitumen. Geological terminology often prefers the term bitumen.
Common usage often refers to various forms of asphalt/bitumen as
"tar", such as at the La Brea Tar Pits. Another term, mostly
archaic, refers to asphalt/bitumen as "pitch". The pitch used in
this mixture is sometimes found in natural deposits but usually
made by the distillation of crude oil.
Naturally occurring asphalt/bitumen is sometimes specified by the
term "crude bitumen"; its viscosity is similar to that of cold
molasses.[2][3] whilst the material obtained from the fractional
distillation of crude oil [boiling at **5 °C (**7 °F)] is sometimes
referred to as "refined bitumen".
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