Asphalt

Question 1

Asphalt

Answer 1

Petroleum Based cementitious material that is mixed with aggregate to form the pavement

Question 2

Common names for Asphalt

Answer 2

Asphalt, asphalt pavement, asphalt concrete, bituminous Concrete

Question 3

Is Asphalt Flexible or Rigid?

Answer 3

Flexible

Question 4

ASTM

Answer 4

American Society for Testing and Materials

Question 5

AASHTO

Answer 5

American Association of State Highway and Transportation Officials

Question 6

Thermoplasticity

Answer 6

Deforms under loads
Liquefies with heat
Asphalt is a flexible type of pavement

Question 7

Viscosity

Answer 7

a measure of a fluid’s resistance to flow

directly influenced by the temperature

Temperature increase means a decrease in viscosity

Question 8

Asphalt Grades

Answer 8

Degrees of Hardiness Grading for use-type

Question 9

Asphalt Weathering

Answer 9

Oxidation and evaporation of hydrocarbons causes: Loss of plasticity
Become Brittle with Age

Question 10

How to avoid weathering in Asphalt?

Answer 10

Slope subbases and subgrades
Proper compaction of layers
Timely sealing

Question 11

Asphalt Insolvency

Answer 11

Resistant: Water, Salts, Acids, Alkalis
Susceptible: Petroleum
Remedy: Tar Sealer

Question 12

Asphalt Color

Answer 12

Black

Question 13

Selection Criteria for Asphalt Cements or Binder

Answer 13

Local Standards and practices

Question 14

Fine Aggregate (Flows through No. 8 Sieve)

Answer 14

Mineral Dust

Mineral Filler

Question 15

Coarse Aggregate (Retained by #8 Sieve)

Answer 15

Major Stabilizer

Question 16

Macadam Aggregate

Answer 16

Coarse Aggregates of uniform size of 1.5-2.5”
Coarse wearing surface
Mixed with asphalt cement

Question 17

Fine-graded Aggregate

Answer 17

Finer texture

Less road noise

Question 18

Coarse-Graded Aggregate

Answer 18

Stable pavement
Coarser surface texture
More road noise

Question 19

Dense-Graded Aggregate

Answer 19

Durable
Watertight surface
Highly stable

Question 20

Open-Graded Aggregate

Answer 20

Little or no mineral filler
Larger aggregates
Good strength
Rough texture
High permeability
Used in regions free of frost/thaw conditions

Question 21

Recycled Glass as Aggregate

Answer 21

Works well in asphalt pavements of heavy use

Question 22

Aggregate Hardiness (Toughness)

Answer 22

Ability to withstand loads and wear

Question 23

Resistance to Stripping

Answer 23

Hydrophilic aggregates tend to strip away from the asphalt bond, reducing stability and skid resistance

Compounds (admixture?) added to asphalt mixtures

Question 24

Surface Texture

Answer 24

Rough surface aids in bonding, stability, resistance to skidding and abrasion

Question 25

Crushed Shape Aggregate

Answer 25

Interlock and give the pavement more strength

Question 26

Asphalt Paving Mixtures: Asphalt Concrete

Answer 26

Most Common asphalt paving mixture

Question 27

Asphalt Paving Mixtures: Surface Treatments

Answer 27

Color coating, sealing, improving skid resistance, or prolonging the service life of a fair to good pavement surface

Question 28

Asphalt Paving Mixtures: Paving Blocks

Answer 28

Pre-molded | Used for Pedestrian Paving

Question 29

Asphalt Paving Mixtures: Asphalt-treated Granular Base Courses

Answer 29

Less cost | Can be treated with asphalt cement to produce a stabilized base course

Question 30

Typical Pavement Sections

Answer 30

(1) Layered Asphalt-Aggregate mixtures over a subgrade/improved subgrade (2) Layered Asphalt-Aggregate mixtures over an aggregate base over a subgrade (3) Layered Asphalt-Aggregate mixtures over existing pavement

Question 31

Pavement Functions

Answer 31

Support loads Smooth Resistant to weathering

Question 32

Minimum total Thickness of the Combined Asphalt Concrete Layers

Answer 32

The minimum total thickness of the combined asphalt concrete layers is 3” - 4”

Question 33

Full-Depth Design

Answer 33

Asphalt aggregate mixture placed directly on a subgrade

Question 34

Aggregate Base Design

Answer 34

Asphalt concrete placed on an untreated aggregate base over the prepared subgrade Used in locations with frost action

Question 35

Traffic Class I

Answer 35

Parking Lots, Driveways, Light Traffic, Residential Streets, Farm Roads

Question 36

Traffic Class II

Answer 36

Residential Streets, Rural Farm and Residential Roads

Question 37

Traffic Class III

Answer 37

Urban Minor Collector Streets

Question 38

Traffic Class IV

Answer 38

Urban Minor Arterial and Light industrial Streets, Rural Major Collector, Minor arterial Highway

Question 39

Traffic Class V

Answer 39

Urban Freeways, Expressways, Principal Arterial Highways, Urban interstate Highways, Some Industrial Roads

Question 40

Road Thickness Design Procedure

Answer 40

Classify the traffic Classify the subgrade Determine Optimum asphalt concrete specs Determine the thickness

Question 41

Bike Paths and Walkway Width

Answer 41

3”-4” Wide | Use local codes and requirements

Question 42

Golf Cart Paths

Answer 42

Surface a sand-asphalt mixture

Question 43

Tennis Courts

Answer 43

Asphalt-concrete base of 0.75” of nominal maximum size designation covered either with sand-asphalt for the surface course or with a proprietary surfacing Base course 3” Surface course 1”

Question 44

Asphalt Curbs

Answer 44

Back-filled with a solid granular material or well-compacted soil Install on top of a solid, impervious pavement

Question 45

Asphalt Gutters

Answer 45

Can be formed in a variety of cross-sections

Question 46

Asphalt Underlayments

Answer 46

Asphalt Concrete is often used as an underlayment for surface courses