Alva Crenshaw |
2018-08-24 01:38:00 Question
Explain Bitumen, asphalt and tar ?
These are called bituminous materials and their main constituent is
(a) Bitumen: It is obtained by fractional distillation of crude petroleum. It is specified by term
penetration, say 80/100 means penetration of standard needle is 80 to 100 mm at a temperature of
25°C. It is used for damp proof course, roofing felt.
(b) Asphalt: It is bitumen mixed with inert material like sand, gravel and crushed stone. It is found in
natural form. It is artificially manufactured also. It is used for waterproofing floors and roofs,
lining reservoirs and swimming pools, for grouting expansion joints.
(c) Tar: It is obtained by destructive distillation of coal, wood or mineral tar. It is used for road
work, anti-termite treatment and waterproofing.