Asphalt Exam Questions with
Accurate Solutions
Difference between Asphalt and Tar - -Asphalt is soluble in petroleum, tar is
not.
Asphalt has bitumens, tar has low bitumens
- Two Different Distillation Process to Produce Asphalt - -1. Fractional
Distillation: Crude oil is heated, lighter oils vaporize and are drawn off,
leaving behind asphalt cement
2. Destructive Distillation: crude oil heated under pressure to higher
temperatures than fractional distillation
- Penetration test - --Test hardness and consistency
- Viscosity test - -Tests resistance to flow
- Superpave binder - -Another name for asphalt
- Asphalt is selected based on... - -1. Climate
2. Traffic
3. Location
- Flash Point Test - --Asphalt cements are heated before use in construction
-Must understand what the max temp the material can be heated to safely
-Flash point = temp at which an instantaneous flash occurs
- Thin-film oven test - --Used to simulate the aging that takes place during
the production of hot mix and during 1st year of pavement's life
- Ductility test - -Workability
- Solubility - --Determines the purity of the asphalt cement
-The Asphalt cement will soluble in a particular solvent
- RAP - -Recycled Asphalt Pavement
-Milling (grinding) removal of old asphalt pavements and reused in new hot
mic asphalt pavements
- Asphalt can be modified into liquid form known as ___ or ____ - -Cutback
Asphalt or an Emulsion
, - Saybolt Furol Viscosity Test - -Measures anionic and cationic emulsions
- Distillation test - -Used to determine the relative proportions of asphalt
cement and water in the asphalt emulsion
- Settlement test - -Detects the tendency of asphalt globules to "settle out"
during storage of emulsified asphalt
- Sieve test - -Determine quantitatively the percentage of asphalt cement
present in the form of pieces, strings, or relatively large globules
- Cationic - -Positively charged Emulsion
- Anionic - -Negatively charged Emulsion
- Basic requirements for an asphalt pavement - -1. Have sufficient total
thickness and internal strength to carry expected traffic loads
2. Prevent penetration or internal accumulation of moisture.
3. Have top surface that's smooth and resistant to wear, distortion, skidding,
and deterioration by weather and de-icing chemicals
- Courses of Asphalt Pavement (Top to Bottom) - -1. Surface Course
2. Binder Course
3. Base Course
4. Sub-base course
5. Subgrade
- Factors that determine asphalt pavement thickness - -1. Traffic
2. Subgrade strength
3. Strength and other influencing characteristics of the material available or
chose for the layers or courses in the total asphalt pavement structure
4. Any other special factors
- The weight and volume of ____ that a road is expected to carry initially and
throughout its design life influence the required thickness of asphalt
pavement structure, as well as mix selection and mix design. - -Traffic
- HMA (hot mix asphalt) - -Asphalt concrete paving mixtures prepared in a
hot mix plant
-Considered highest quality type of asphalt mixture bc the plant removes all
ambient moisture from aggregates which ensures the best bond between
aggregates and asphalt binder
Accurate Solutions
Difference between Asphalt and Tar - -Asphalt is soluble in petroleum, tar is
not.
Asphalt has bitumens, tar has low bitumens
- Two Different Distillation Process to Produce Asphalt - -1. Fractional
Distillation: Crude oil is heated, lighter oils vaporize and are drawn off,
leaving behind asphalt cement
2. Destructive Distillation: crude oil heated under pressure to higher
temperatures than fractional distillation
- Penetration test - --Test hardness and consistency
- Viscosity test - -Tests resistance to flow
- Superpave binder - -Another name for asphalt
- Asphalt is selected based on... - -1. Climate
2. Traffic
3. Location
- Flash Point Test - --Asphalt cements are heated before use in construction
-Must understand what the max temp the material can be heated to safely
-Flash point = temp at which an instantaneous flash occurs
- Thin-film oven test - --Used to simulate the aging that takes place during
the production of hot mix and during 1st year of pavement's life
- Ductility test - -Workability
- Solubility - --Determines the purity of the asphalt cement
-The Asphalt cement will soluble in a particular solvent
- RAP - -Recycled Asphalt Pavement
-Milling (grinding) removal of old asphalt pavements and reused in new hot
mic asphalt pavements
- Asphalt can be modified into liquid form known as ___ or ____ - -Cutback
Asphalt or an Emulsion
, - Saybolt Furol Viscosity Test - -Measures anionic and cationic emulsions
- Distillation test - -Used to determine the relative proportions of asphalt
cement and water in the asphalt emulsion
- Settlement test - -Detects the tendency of asphalt globules to "settle out"
during storage of emulsified asphalt
- Sieve test - -Determine quantitatively the percentage of asphalt cement
present in the form of pieces, strings, or relatively large globules
- Cationic - -Positively charged Emulsion
- Anionic - -Negatively charged Emulsion
- Basic requirements for an asphalt pavement - -1. Have sufficient total
thickness and internal strength to carry expected traffic loads
2. Prevent penetration or internal accumulation of moisture.
3. Have top surface that's smooth and resistant to wear, distortion, skidding,
and deterioration by weather and de-icing chemicals
- Courses of Asphalt Pavement (Top to Bottom) - -1. Surface Course
2. Binder Course
3. Base Course
4. Sub-base course
5. Subgrade
- Factors that determine asphalt pavement thickness - -1. Traffic
2. Subgrade strength
3. Strength and other influencing characteristics of the material available or
chose for the layers or courses in the total asphalt pavement structure
4. Any other special factors
- The weight and volume of ____ that a road is expected to carry initially and
throughout its design life influence the required thickness of asphalt
pavement structure, as well as mix selection and mix design. - -Traffic
- HMA (hot mix asphalt) - -Asphalt concrete paving mixtures prepared in a
hot mix plant
-Considered highest quality type of asphalt mixture bc the plant removes all
ambient moisture from aggregates which ensures the best bond between
aggregates and asphalt binder
