Construction Materials - Asphalt Questions
with Detailed Verified Answers for
Accuracy
what are bituminous materials?
✓✓ a solid, semisolid or viscous material, natural or manufactured,
composed principally of various mixtures of complex hydrocarbons
asphalts
✓✓ cementitious materials composed largely of bitumens
tars
✓✓ condensate from destructive distillation of petroleum, coal, wood,
or shale
what did the pitch drop experiment demonstrate?
✓✓ demonstrates the fluidity and high viscosity of pitch, a derivative
of tar once used for waterproofing boats
natural asphalts
✓✓ - lake asphalt
- gilsonite
- rock asphalt
pg. 1
,qualities of petroleum asphalt
✓✓ - fractional distillation: distill above 900F to drive off volatiles
- destructive distillation: above 1100F for cracking
classification of petroleum asphalts
✓✓ - asphalt cement
- cutback asphalt
- emulsified asphalt
qualities of asphalt cement
✓✓ - blend of hydrocarbons of different molecular weights
- heavier molecular-weight hydrocarbons, harder and more viscous
- semisolid materials at room temp
- heated before applying
- most common binder material used in pavements
what are liquid asphalt-cutbacks
✓✓ produced by dissolving asphalt cement in a lighter molecular
weight hydrocarbon solvent
advantage of liquid asphalt-cutbacks
✓✓ applied easily in the field without heating
pg. 2
, disadvantages of liquid asphalt-cutbacks
✓✓ -not cost effective
- hazardous materials due to the volatility of the solvents
- releasing environmentally unacceptable hydrocarbons into the
atmosphere
what are liquid asphalt-emulsion?
✓✓ produced by dispersing the asphalt in water using an emulsifying
agent
why is the use of emulsion increasing?
✓✓ no hazardous or costly solvents
fog seal for preserving existing pavement
✓✓ used to enrich oxidized asphalt surface or to seal very small
cracks and surface voids
micro-surfacing
✓✓ used as a protective or rehabilitative maintenance technique for
paved surface of thin asphalt surface treatment
chip seal
✓✓ uses multiple surface treatments
pg. 3
with Detailed Verified Answers for
Accuracy
what are bituminous materials?
✓✓ a solid, semisolid or viscous material, natural or manufactured,
composed principally of various mixtures of complex hydrocarbons
asphalts
✓✓ cementitious materials composed largely of bitumens
tars
✓✓ condensate from destructive distillation of petroleum, coal, wood,
or shale
what did the pitch drop experiment demonstrate?
✓✓ demonstrates the fluidity and high viscosity of pitch, a derivative
of tar once used for waterproofing boats
natural asphalts
✓✓ - lake asphalt
- gilsonite
- rock asphalt
pg. 1
,qualities of petroleum asphalt
✓✓ - fractional distillation: distill above 900F to drive off volatiles
- destructive distillation: above 1100F for cracking
classification of petroleum asphalts
✓✓ - asphalt cement
- cutback asphalt
- emulsified asphalt
qualities of asphalt cement
✓✓ - blend of hydrocarbons of different molecular weights
- heavier molecular-weight hydrocarbons, harder and more viscous
- semisolid materials at room temp
- heated before applying
- most common binder material used in pavements
what are liquid asphalt-cutbacks
✓✓ produced by dissolving asphalt cement in a lighter molecular
weight hydrocarbon solvent
advantage of liquid asphalt-cutbacks
✓✓ applied easily in the field without heating
pg. 2
, disadvantages of liquid asphalt-cutbacks
✓✓ -not cost effective
- hazardous materials due to the volatility of the solvents
- releasing environmentally unacceptable hydrocarbons into the
atmosphere
what are liquid asphalt-emulsion?
✓✓ produced by dispersing the asphalt in water using an emulsifying
agent
why is the use of emulsion increasing?
✓✓ no hazardous or costly solvents
fog seal for preserving existing pavement
✓✓ used to enrich oxidized asphalt surface or to seal very small
cracks and surface voids
micro-surfacing
✓✓ used as a protective or rehabilitative maintenance technique for
paved surface of thin asphalt surface treatment
chip seal
✓✓ uses multiple surface treatments
pg. 3
