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 ?
Delivery asphalt concrete based on natural asphalt patching potholes intended for communications I to III.
A technique used since the 1800s, heliography uses natural asphalt to coat glass or metal; it hardens in proportion to its exposure to light.
China natural asphalt or earth asphalt mining and dressing industry China coal mining and washing industry China soft coal, anthracite mining and washing industry China lignite mining and washing industry China other coal mining and washing industry China oil and natural gas extraction industry China natural crude oil and natural gas mining industry China feather (down) product processing industry China lumber, wood chip and wood product processing industry China lumber, wood chip processing industry
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.
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.
Delivery asphalt concrete based on natural asphalt intended for patching potholes roads I to III.
China natural asphalt or earth asphalt mining and dressing Industry, 2010 is valuable for anyone who wants to invest in the natural asphalt or earth asphalt mining and dressing industry, to get Chinese investments; to import into China or export from China, to build factories and take advantage of lower costs in China, to partner with one of the key Chinese corporations, to get market shares as China is boosting its domestic needs; to forecast the future of the world economy as China is leading the way; or to compete in the segment.
Ketones are the major oxidation product formed in both the natural asphalt and bitumen samples.