CIVILEN 3510 Lecture Notes - Lecture 4: Thixotropy, Distillation, Surface 2
2 May 2016
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Historical data: used in mesopotamia in waterproofing of reservoirs about 3000 bc, asphalt was first used for pavements in the middle of the 19th century, trinidad lake asphalt: used in 1976 to pave portions of pennsylvania. Viscous liquid or solid essentially hydrocarbons and their derivatives. Bitumen for roads asphalt or tar. Viscous black liquid, obtained by destructive distillation of coal, wood, shale, etc. Distillation means that it is subject to heat and high pressure, without access to air. Approximately 40% asphalt + 30% water + 30% mineral matter (e. g. clay: gilsonite. Primary use in asphalt paints and asphalt floor tiles: petroleum asphalt. Primary source from the refining of petroleum. Higher grade crude oil 10% asphalts. Classification according to use: paving (road construction) Primarily produced by the vacuum and steam refining and solvent de- asphalting process. Petroleum asphalts include asphalt cements, cutback asphalts, emulsified asphalts, and air-blown asphalts.
