Page 1
Construction Materials - Asphalt Latest
Questions and Correct Answers
what are bituminous materials?
Ans: a solid, semisolid or viscous material, natural or
manufactured, composed principally of various mixtures
of complex hydrocarbons
asphalts
Ans: cementitious materials composed largely of
bitumens
tars
Ans: condensate from destructive distillation of
petroleum, coal, wood, or shale
what did the pitch drop experiment demonstrate?
Ans: demonstrates the fluidity and high viscosity of
pitch, a derivative of tar once used for waterproofing
boats
natural asphalts
Ans: - lake asphalt
- gilsonite
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- rock asphalt
qualities of petroleum asphalt
Ans: - fractional distillation: distill above 900F to drive
off volatiles
- destructive distillation: above 1100F for cracking
classification of petroleum asphalts
Ans: - asphalt cement
- cutback asphalt
- emulsified asphalt
qualities of asphalt cement
Ans: - 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
Ans: produced by dissolving asphalt cement in a lighter
molecular weight hydrocarbon solvent
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advantage of liquid asphalt-cutbacks
Ans: applied easily in the field without heating
disadvantages of liquid asphalt-cutbacks
Ans: -not cost effective
- hazardous materials due to the volatility of the
solvents
- releasing environmentally unacceptable hydrocarbons
into the atmosphere
what are liquid asphalt-emulsion?
Ans: produced by dispersing the asphalt in water using
an emulsifying agent
why is the use of emulsion increasing?
Ans: no hazardous or costly solvents
fog seal for preserving existing pavement
Ans: used to enrich oxidized asphalt surface or to seal
very small cracks and surface voids
micro-surfacing
Construction Materials - Asphalt Latest
Questions and Correct Answers
what are bituminous materials?
Ans: a solid, semisolid or viscous material, natural or
manufactured, composed principally of various mixtures
of complex hydrocarbons
asphalts
Ans: cementitious materials composed largely of
bitumens
tars
Ans: condensate from destructive distillation of
petroleum, coal, wood, or shale
what did the pitch drop experiment demonstrate?
Ans: demonstrates the fluidity and high viscosity of
pitch, a derivative of tar once used for waterproofing
boats
natural asphalts
Ans: - lake asphalt
- gilsonite
, Page 2
- rock asphalt
qualities of petroleum asphalt
Ans: - fractional distillation: distill above 900F to drive
off volatiles
- destructive distillation: above 1100F for cracking
classification of petroleum asphalts
Ans: - asphalt cement
- cutback asphalt
- emulsified asphalt
qualities of asphalt cement
Ans: - 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
Ans: produced by dissolving asphalt cement in a lighter
molecular weight hydrocarbon solvent
, Page 3
advantage of liquid asphalt-cutbacks
Ans: applied easily in the field without heating
disadvantages of liquid asphalt-cutbacks
Ans: -not cost effective
- hazardous materials due to the volatility of the
solvents
- releasing environmentally unacceptable hydrocarbons
into the atmosphere
what are liquid asphalt-emulsion?
Ans: produced by dispersing the asphalt in water using
an emulsifying agent
why is the use of emulsion increasing?
Ans: no hazardous or costly solvents
fog seal for preserving existing pavement
Ans: used to enrich oxidized asphalt surface or to seal
very small cracks and surface voids
micro-surfacing
