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