Black or brown petroleum-like material that contains a consistency varying from the viscous liquid to the glassy solid. it’s obtained either as a residue from the distillation of petroleum or from natural deposits. natural asphalt consists of compounds of hydrogen and carbon with minor proportions of nitrogen, sulfur, and oxygen. natural asphalt (also known as Brea), that is believed to be formed during an early stage within the breakdown of organic marine deposits into petroleum, characteristically contains minerals, whereas residual petroleum asphalt doesn’t.
The use of natural asphalt is very old, dating back to its use as a water stop between brick walls of a reservoir at Mohenjo-Daro (about the third-millennium bc) in Pakistan. within the middle east, it was extensively used for paving roads and sealing waterworks, necessary applications even today. The Pitch Lake on the island of Trinidad was the primary large commercial supply, however, natural supplies have since declined in importance as petroleum became the major source. Gilsonite, wurtzite, and similar vein asphalts have special uses in heat-resistant enamels; they are hard and are mined like coal. oil asphalt is made altogether consistencies from light-weight road oils to heavy, high-viscosity industrial types.
Natural asphalt softens once heated and is elastic under certain conditions. The mechanical properties of natural asphalt are of very little significance except once it’s used as a binder or adhesive. The principal application of asphalt is in road surfacing, which can be done in a variety of the way. light oil “dust layer” treatments are also engineered up by repetition to create a hard surface, or a granular aggregate is also added to an asphalt coat, or earth materials from the road surface itself are also mixed with the natural asphalt.
Although natural asphalt is mainly used for paving roads, it also can be used for various different purposes. the versatility of natural asphalt makes it such a wide used material. Among others, it may be found within the following sectors:
- Transportation (e.g. roads, railway beds or airport runways, taxiways, etc.),
- Recreation (playgrounds, bicycle paths, running tracks, tennis courts…)
- Agriculture (barn floors, greenhouse floors…)
- Industrial (ports, landfill caps, work sites…)
- Building construction (floorings…)