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  • Asphalt is a sticky, black and highly viscous liquid or semi-solid that is present in most crude petroleums and in some natural deposits. Asphalt is composed almost entirely of bitumen. It is most commonly modeled as a colloid, with asphaltenes as the dispersed phase and maltenes as the continuous phase.
  • Asphalt is sometimes confused with tar, which is an artificial material produced by the destructive distillation of organic matter. Tar is also predominantly composed of bitumen, but the bitumen content of tar is typically lower than that of asphalt. Tar and asphalt have very different engineering properties. In Europe, the commonly used word for asphalt is bitumen.
  • Asphalt can be separated from the other components in crude oil (such as naphtha, gasoline and diesel) by the process of fractional distillation, usually under vacuum conditions. A better separation can be achieved by further processing of the heavier fractions of the crude oil in a de-asphalting unit, which uses either propane or butane in a supercritical phase to dissolve the lighter molecules which are then separated.
  • Asphalt is typically stored and transported at temperatures around 150 degrees Celsius (300 F). They shrink on cooling, so large splashes on the skin are especially hazardous. Sometimes diesel oil or kerosene are mixed in before shipping to retain liquidity; upon delivery, these lighter materials are separated out of the mixture. This mixture is often called bitumen feedstock.
  • Shilajeet is obtained from rocks in the Himalayan region. It is a form of mineral that drips from the cracks of the rocks during hot weather. It is decomposition of the plant matter in the rocks centuries before.
  • The production of asphalt takes place at HOT MIXs state-of-the-art facility located in Gosnells. The plant is based on the latest international production technology and boasts important features such as fully enclosed dust collection system, additive processing including colour agents, fibres, polymers as well as processing of recycled pavement materials.
  • There are two industries that fall under the category of asphalt manufacture: hot mix asphalt plants and asphalt roofing. Hot mix asphalt plants produce asphalt paving materials, while the asphalt roofing industry manufactures asphalt-saturated felt rolls, fiberglass and organic (felt-base) shingles, and surfaced and smooth roll roofing for use mainly in roof construction.
  • Native Americans living in California used the asphaltum from natural oil seeps to caulk their canoes (top panel), to hold together hunting weapons and baskets (middle two panels), and to make walnut-shell "Huutch Uish" dice (bottom panel).
  •  Global demand for asphalt in roofing applications is expected to approach 12 million metric tons in 2007. Growth in the Asia/Pacific region, the Africa/Mideast region and Eastern Europe will help offset a deceleration of demand in the large US market. Building construction activity in developing countries will generate opportunities for asphaltic membrane roofing.
  • Demand for asphalt in China is forecast to rise 6.8 percent per annum through 2008 to 15 million metric tons. Measured in yuan, asphalt demand is projected to climb more than ten percent annually to 31.5 billion. The Chinese asphalt market will experience the fastest growth among major economies in the world, driven by strong growth in road construction activity and healthy gains in building construction.

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