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An asphalt plant is a plant used for the manufacture of 
The manufacture of coated roadstone demands the combination of a number of aggregates,
research
shows that addition of up to 20% recycled asphalt produces the same quality of asphalt compared to 100% virgin material. The quality of asphalt starts reducing once the percentage of recycled asphalt increases beyond 20%.
The asphalt plant is mainly composed of cold aggregate supply system,
An asphalt plant is a plant used for the manufacture of asphalt
Asphalt, also known as bitumen (, ), is a sticky, black, 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 a ...
, macadam
Macadam is a type of road construction, pioneered by Scottish engineer John Loudon McAdam around 1820, in which crushed stone is placed in shallow, convex layers and compacted thoroughly. A binding layer of stone dust (crushed stone from the o ...
and other forms of coated roadstone, sometimes collectively known as blacktop
Asphalt concrete (commonly called asphalt, blacktop, or pavement in North America, and tarmac, bitumen macadam, or rolled asphalt in the United Kingdom and the Republic of Ireland) is a composite material commonly used to surface roads, parkin ...
or asphalt concrete
Asphalt concrete (commonly called asphalt, blacktop, or pavement in North America, and tarmac, bitumen macadam, or rolled asphalt in the United Kingdom and the Republic of Ireland) is a composite material commonly used to surface roads, parkin ...
.
The manufacture of coated roadstone demands the combination of a number of aggregates, sand
Sand is a granular material composed of finely divided mineral particles. Sand has various compositions but is defined by its grain size. Sand grains are smaller than gravel and coarser than silt. Sand can also refer to a textural class of s ...
and a filler (such as stone dust), in the correct proportions, heated, and finally coated with a binder, usually bitumen
Asphalt, also known as bitumen (, ), is a sticky, black, 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 a ...
based or, in some cases tar
Tar is a dark brown or black viscous liquid of hydrocarbons and free carbon, obtained from a wide variety of organic materials through destructive distillation. Tar can be produced from coal, wood, petroleum, or peat. "a dark brown or black bit ...
, although tar was removed from BS4987 in 2001 and is not referred to in BSEN 13108/1. The temperature of the finished product must be sufficient to be workable after transport to the final destination. A temperature in the range of 100 to 200 degrees Celsius is normal.
Countries have individual specifications stipulating how much of the raw material can be allowed from recycled asphalt. In-deptresearch
shows that addition of up to 20% recycled asphalt produces the same quality of asphalt compared to 100% virgin material. The quality of asphalt starts reducing once the percentage of recycled asphalt increases beyond 20%.
Main Structure
The asphalt plant is mainly composed of cold aggregate supply system, drum dryer
A rotary dryer is a type of industrial dryer used to reduce or minimize the moisture content of the material it is handling by bringing it into contact with a heated gas. The dryer is made up of a rotating cylinder ("drum" or "shell"), a drive mech ...
, coal burner, coal feeder, dust collector, hot aggregate elevator, vibrating screen, filler supply system, weighing and mixing system, Pollution Control Unit , asphalt storage, bitumen supply system. All these components have characteristics that impact not only the overall quality of the asphalt but also the effect on the environment.
References
{{Authority control Asphalt