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11 terms

Material Science - CH 6-8

STUDY
PLAY
Bitumen
viscous liquid/solid. waterproofing & adhesive property. pet based.
Tar
viscous black liquid, obtained by destructive distillation of coal, wood, shale.
Natural Asphalts-
Trinidad lake, gilsonite, and petroleum asphalt
Uses
Paving, Roofing, Protective Coatings
Constituents
Asphaltine, resin, light oil, impurities
Properties of Asphalt
Adhesion, consistency, specific gravity, durability, rate of curing, ductility, aging and hardening, resistance to water
viscosity
most important property. measure of resistance to flow
kinematic viscosity
measure of resistance to flow under gravity. = visc of liquid/density
ductility
measures cement's ability to deform w/o breaking
Failures of asphalt concrete
rutting fatigue cracking, bleeding or flushing, raveling, stripping, or thermal cracking.
classifications of asphalt binders
performance grading, penetration grading, aged-residue grading