natural asphalt

natural asphalt

[′nach·rəl ′as‚fȯlt]
(geology)

natural asphalt

Asphalt occurring in nature, produced from petroleum by natural evaporation or distillation; usually not suitable for paving purposes until refined and softened to proper consistency by combining with flux oil.
References in periodicals archive ?
Ghanem indicated that Petroleum Ministry is keen on participating in the expo through its products of raw materials which are required for building and construction such as marble and natural asphalt and others with the aim of encouraging the industry and the national products.
3 manufacturing bituminous mixtures based on natural asphalt or bitumen, petroleum bitumen, mineral resins or pitches
com/science/heavy-oil) Bitumen  is also known as natural asphalt and has a tar-like consistency.
A technique used since the 1800s, heliography uses natural asphalt to coat glass or metal; it hardens in proportion to its exposure to light.
Its minerals have been sought after since ancient times: The pharaohs were embalmed with the lake's natural asphalt lumps, and Cleopatra is said to have used its skin-rejuvenating salts and mud.
As such we sought to explore the possibility of utilizing scrap tyres in the local natural asphalt, TLA, as one way of helping to reduce the disposal problem.
Warren replaced costly pine pitch with coal tar and later found a natural asphalt that could be combined with petroleum tar to produce a roofing pitch, according to From Asbestos to Zinc: Roofing for Historic Buildings, a report from the Technical Services Branch of the National Park Service.
Dasag's range of natural asphalt tiles continues a 100-year tradition that has seen finely ground bituminous limestone pressed into durable and elegant tiles.
Natural asphalt is a primadonna commodity of Southeast Sulawesi.
Trinidad Lake Asphalt (TLA), which is found in Trinidad and Tobago in the largest deposit of natural asphalt in the world, has been applied in some of the most heavily trafficked transportation sites worldwide.
Tenders are invited for Non-metallic mineral products, other neog (Bituminous mixtures based on natural and artificial filler and bitumen or natural asphalt as a binder - code DK 016-2010 -23.
Ketones are the major oxidation product formed in both the natural asphalt and bitumen samples.