Bitumen

タイトルまたは説明

Bitumen also known as tar, asphalt, tarmac, blacktop is an oil-based substance. It is semi solid hydrocarbon product produced by removing the lighter fractions (such as liquid petroleum gas, petrol and diesel) from heavy crude oil during the refining process. Bitumen is a stable, semi-solid substance at ambient temperatures.
 
The vast majority of refined bitumen is used in construction: primarily as a constituent of products used in paving and roofing applications. According to the requirements of the end use bitumen is produced to specification. This is achieved either by refining or blending process.
 
It is estimated that the current world use of bitumen is approximately **3 million tones per year. Approximately *5% of all the bitumen produced is used as the binder in asphalt for roads. It is also used in other paved areas such as airport runways, car parks and footways.