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Time-Saver Standards for Landscape Architecture > Asphalt > Flashcards

Asphalt Flashcards

1
Q

Asphalt

A

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

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2
Q

Common names for Asphalt

A

Asphalt, asphalt pavement, asphalt concrete, bituminous Concrete

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3
Q

Is Asphalt Flexible or Rigid?

A

Flexible

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4
Q

ASTM

A

American Society for Testing and Materials

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5
Q

AASHTO

A

American Association of State Highway and Transportation Officials

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6
Q

Thermoplasticity

A

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

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7
Q

Viscosity

A

a measure of a fluid’s resistance to flow

directly influenced by the temperature

Temperature increase means a decrease in viscosity

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8
Q

Asphalt Grades

A

Degrees of Hardiness Grading for use-type

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9
Q

Asphalt Weathering

A

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

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10
Q

How to avoid weathering in Asphalt?

A

Slope subbases and subgrades
Proper compaction of layers
Timely sealing

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11
Q

Asphalt Insolvency

A

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

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12
Q

Asphalt Color

A

Black

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13
Q

Selection Criteria for Asphalt Cements or Binder

A

Local Standards and practices

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14
Q

Fine Aggregate (Flows through No. 8 Sieve)

A

Mineral Dust

Mineral Filler

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15
Q

Coarse Aggregate (Retained by #8 Sieve)

A

Major Stabilizer

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16
Q

Macadam Aggregate

A

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

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17
Q

Fine-graded Aggregate

A

Finer texture

Less road noise

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18
Q

Coarse-Graded Aggregate

A

Stable pavement
Coarser surface texture
More road noise

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19
Q

Dense-Graded Aggregate

A

Durable
Watertight surface
Highly stable

20
Q

Open-Graded Aggregate

A 
Little or no mineral filler
Larger aggregates
Good strength
Rough texture
High permeability
Used in regions free of frost/thaw conditions
21
Q

Recycled Glass as Aggregate

A

Works well in asphalt pavements of heavy use

22
Q

Aggregate Hardiness (Toughness)

A

Ability to withstand loads and wear

23
Q

Resistance to Stripping

A

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

Compounds (admixture?) added to asphalt mixtures

24
Q

Surface Texture

A

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

25
Q

Crushed Shape Aggregate

A

Interlock and give the pavement more strength

26
Q

Asphalt Paving Mixtures: Asphalt Concrete

A

Most Common asphalt paving mixture

27
Q

Asphalt Paving Mixtures: Surface Treatments

A

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

28
Q

Asphalt Paving Mixtures: Paving Blocks

A

Pre-molded

Used for Pedestrian Paving

29
Q

Asphalt Paving Mixtures: Asphalt-treated Granular Base Courses

A

Less cost

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

30
Q

Typical Pavement Sections

A

(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

31
Q

Pavement Functions

A

Support loads
Smooth
Resistant to weathering

32
Q

Minimum total Thickness of the Combined Asphalt Concrete Layers

A

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

33
Q

Full-Depth Design

A

Asphalt aggregate mixture placed directly on a subgrade

34
Q

Aggregate Base Design

A

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

35
Q

Traffic Class I

A

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

36
Q

Traffic Class II

A

Residential Streets, Rural Farm and Residential Roads

37
Q

Traffic Class III

A

Urban Minor Collector Streets

38
Q

Traffic Class IV

A

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

39
Q

Traffic Class V

A

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

40
Q

Road Thickness Design Procedure

A

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

41
Q

Bike Paths and Walkway Width

A

3”-4” Wide

Use local codes and requirements

42
Q

Golf Cart Paths

A

Surface a sand-asphalt mixture

43
Q

Tennis Courts

A

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”

44
Q

Asphalt Curbs

A

Back-filled with a solid granular material or well-compacted soil

Install on top of a solid, impervious pavement

45
Q

Asphalt Gutters

A

Can be formed in a variety of cross-sections

46
Q

Asphalt Underlayments

A

Asphalt Concrete is often used as an underlayment for surface courses

Time-Saver Standards for Landscape Architecture (6 decks)

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