Pavement Management Flashcards
What is the design purpose of asphalt pavement?
Standard or equivalent wheel load is 18,000 lbs. equivalent single axle load.
What are the three components of asphalt?
Aggregate, Cement (AC20), Air Voids
Mix I-5 is?
FABC = Fine Aggregate Bituminous Concrete
Design criteria or Failure criteria in asphalt can be described as what type of failure?
answer d) all of the above
Performance, Fatigue and Rutting
To achieve the proper level of air void, compaction should not take place below what temperature?
175 degrees
Water that contributes to frost problems in asphalt pavement comes from/
Answer d) all of the above
Surface Water, Moisture held or drawn through the soil, High water Table
Potholes can most effectively be repaired by?
a) removing damaged area and making a full depth repair with proper compaction.
Recommended procedure for cutout deeper than 6” is
a) Placing at fault and more than one lift
What is the single most important factor affecting the life of the pavement?
Compaction
Compaction is defined as?
The process by which the asphalt is compressed and reduced in volume.
What is the recommended percentage of air void?
4 1/2 % - 7%
If asphalt is compacted at lower temperatures, what can you expect?
More voids in the pavement
What is the minimum temperature for rolling asphalt?
175 degrees
What can occur if compaction is continued below 175 degrees?
You may fracture the aggregate
Can compaction vary due to layer thickness?
Yes
What is the ideal mix temperature of asphalt?
300 - 325 degrees
What is the recommended laydown temperature of asphalt?
between 225 and 280 degrees
What is the minimum air temperature you should pave to?
40 degrees
Should you consider heat loss from plant to laydown?
Yes.
Name three important causes of pavement failure?
Weak Subgrade, Design of Pavement and Improper Maintenance
Name four of the eight Pavement Treatments
Overlay, P.S.O. (pulverization stabilization overlay), Crack Sealing, Pot hole repair.
Also, Slurry Seal, Micro Seal, Reconstruction, Mill and Overlay
Crack Sealing and Pot Hole Repair are considered?
Maintenance
A proper pavement management system provides for?
Answer d) all of the above
a) proper maintenance procedures
b) prolongs life expectancy of the road
c) tool for prioritizing street repair
What is considered a structural maintenance technique?
b) overlay
Stabilization of the subgrade can be achieved through the use of?
Answer d) all of the above
a) Lime
b) Calcium Chloride
c) Sodium Chloride
The best ways to prevent alligator cracking is?
a) Crack Sealing
b) Slurry Sealing
The following condition can be corrected most effectively with the use of a Slurry Seal.
c) Polished Aggregate
Bleeding can best be described as free asphalt on the surface of the pavement caused by?
b) To much asphalt in one or more pavement courses
In winter cold asphalt is used because?
c) Stockpiling of material allows greater availabilty and move-ability of material since hot material is not produced
