Asphalt Actual Questions with Detailed Answers
Question 1.
How are Natural Asphalts formed?
Correct Answer: When crude petroleum oils rose to the earths surface and
formed pools, The action of the sun and wind drove off the lighter oils and
gases, leaving a heavy residue.
Question 2.
What are the differences in asphalt and tar?
Correct Answer: Asphalt- a dark brown black cementitious material, solid or
semisolid in consistency, in which the predominating constituents are bitumens
which occur in nature such as or are obtained as residue in refining petroleum.
Tar-brown or black bituminous material, liquid or semisolid in consistency, in
which the predominating constituents are bitumens obtained by condensates in
the destructive distillation of coal, petroleum, oil, shale, wood, or other organic
materials, and which yields substantial quantities of pitch when distilled.
Question 3.
What are bituminous materials?
Correct Answer: Mixture of hydrocarbons of natural or pyrogenous origin or
combinations of both, frequently accompanied by their nonmetallic derivatives,
which are completely soluble in carbon disulfide.
Question 4.
What are the classifications of petroleum crude oil, based on their asphalt content?
Correct Answer: 1) Asphaltic base crude (almost entirely asphalt)
2) Paraffin base crude (contains paraffin but no asphalt)
3) Mixed base crude (contains both paraffin and asphalt)
Question 5.
5) How is the percentage of asphalt in a crude oil determined?
Correct Answer: Amount of asphalt obtained from a crude oil is based on its API
gravity. The higher the gravity the lower asphalt and vise versa
, Question 6.
6) What distillation process is used to produce asphalt?
Correct Answer: Typical crude oil is produced through a distillation tower. The
crude oil is heated to 650 degrees to 700 degrees and fed into the atmospheric
tower. Materials will rise based on their boiling points and the residual, heavy
material is the asphalt binder.
Question 7.
7) What do the basic tests of asphalt materials measure?
Correct Answer: The consistency properties of catonic and anionic emulsions
using a viscosity test at two different temps. The relative properties of asphalt
emulsions and the cement residue, and many others
Question 8.
8) Basic requirements of asphalt pavement?
Correct Answer: 1) Have sufficient total thickness and internal strength to carry
expected traffic loads
2) Prevent penetration or internal accumulation of water
3) Have a top surface that is smooth and resistant to wear distortion, skidding,
and deterioration by weathering and deicing chemicals.
Question 9.
9) Factors to consider when designing asphalt pavement thickness?
Correct Answer: 1) Traffic to be served initially and over the design service of
the pavement.
2) Strength and other pertinent properties of the subgrade
3) Strength and other influencing. Characteristics of the materials are available
or chosen for the layers or courses in the total asphalt pavement structure.
4) Any special factors peculiar to the road being designed
1) Traffic to be served initially and over the design service of the pavement.
2) Strength and other pertinent properties of the subgrade
3) Strength and other influencing. Characteristics of the materials are available
or chosen for the layers or courses in the total asphalt pavement structure.
4) Any special factors peculiar to the road being designed
Question 1.
How are Natural Asphalts formed?
Correct Answer: When crude petroleum oils rose to the earths surface and
formed pools, The action of the sun and wind drove off the lighter oils and
gases, leaving a heavy residue.
Question 2.
What are the differences in asphalt and tar?
Correct Answer: Asphalt- a dark brown black cementitious material, solid or
semisolid in consistency, in which the predominating constituents are bitumens
which occur in nature such as or are obtained as residue in refining petroleum.
Tar-brown or black bituminous material, liquid or semisolid in consistency, in
which the predominating constituents are bitumens obtained by condensates in
the destructive distillation of coal, petroleum, oil, shale, wood, or other organic
materials, and which yields substantial quantities of pitch when distilled.
Question 3.
What are bituminous materials?
Correct Answer: Mixture of hydrocarbons of natural or pyrogenous origin or
combinations of both, frequently accompanied by their nonmetallic derivatives,
which are completely soluble in carbon disulfide.
Question 4.
What are the classifications of petroleum crude oil, based on their asphalt content?
Correct Answer: 1) Asphaltic base crude (almost entirely asphalt)
2) Paraffin base crude (contains paraffin but no asphalt)
3) Mixed base crude (contains both paraffin and asphalt)
Question 5.
5) How is the percentage of asphalt in a crude oil determined?
Correct Answer: Amount of asphalt obtained from a crude oil is based on its API
gravity. The higher the gravity the lower asphalt and vise versa
, Question 6.
6) What distillation process is used to produce asphalt?
Correct Answer: Typical crude oil is produced through a distillation tower. The
crude oil is heated to 650 degrees to 700 degrees and fed into the atmospheric
tower. Materials will rise based on their boiling points and the residual, heavy
material is the asphalt binder.
Question 7.
7) What do the basic tests of asphalt materials measure?
Correct Answer: The consistency properties of catonic and anionic emulsions
using a viscosity test at two different temps. The relative properties of asphalt
emulsions and the cement residue, and many others
Question 8.
8) Basic requirements of asphalt pavement?
Correct Answer: 1) Have sufficient total thickness and internal strength to carry
expected traffic loads
2) Prevent penetration or internal accumulation of water
3) Have a top surface that is smooth and resistant to wear distortion, skidding,
and deterioration by weathering and deicing chemicals.
Question 9.
9) Factors to consider when designing asphalt pavement thickness?
Correct Answer: 1) Traffic to be served initially and over the design service of
the pavement.
2) Strength and other pertinent properties of the subgrade
3) Strength and other influencing. Characteristics of the materials are available
or chosen for the layers or courses in the total asphalt pavement structure.
4) Any special factors peculiar to the road being designed
1) Traffic to be served initially and over the design service of the pavement.
2) Strength and other pertinent properties of the subgrade
3) Strength and other influencing. Characteristics of the materials are available
or chosen for the layers or courses in the total asphalt pavement structure.
4) Any special factors peculiar to the road being designed
