Post on 08-Feb-2022
transcript
Asphalt Paving Materials
Chapter 6
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Bituminous Materials
BituminousMaterials
NaturalAsphalts
PetroleumAsphalts
Tar &Pitch
(late 1800s) (1900s)(early 1900s)
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Natural Asphalt
Rock Asphalt Native AsphaltAsphalt Sand
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Rock Asphalt
Rock Asphalt
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ROCK ASPHALT & OIL SHALE IN KENTUCKY
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Asphalt Sands
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Asphalt Sands
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Asphalt Sands
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Native Asphalt
La Brea Tar Pits
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Native Asphalt
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Source: Geological Society of Trinidad and Tobago (www.gstt.org)
Native Asphalt
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Native Asphalt
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http://www.flickr.com/photos/striderv/4314238332/lightbox/
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Native Asphalt
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Native Asphalt
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Bituminous Materials
BituminousMaterials
NaturalAsphalts
PetroleumAsphalts
Tar &Pitch
(late 1800s) (1900s)(early 1900s)
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Chickamauga Coking Ovens
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Dunlap, TN Coking Ovens
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Bituminous Materials
BituminousMaterials
NaturalAsphalts
PetroleumAsphalts
Tar &Pitch
(late 1800s) (1900s)(early 1900s)
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Crude Oil ChemistryOils (Hydrocarbons)
Resin-coated asphaltenes
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Crude Oil
AromaticHydrocarbons (oils)
SaturatedHydrocarbons
Light Crude Heavy Crude
“oils”“oils”
“oils”
“oils”
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Petroleum Distillation
TubeHeater
Bitumen Residuum38-70 Carbons
Crude
DistillationColumn
Diesel Oil15-38 Carbons
Kerosene10-14 Carbons
Naphtha5-10 Carbons
Gasoline1-4 Carbons
Butane & Propane1-4 Carbons
550ºC
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Crude Oil
33
20
16
30
58
67
26
21
14
10
28
27
BitumenResiduum
GasolineKerosene
Lt. Gas Oil
Hv. Gas Oil
BoscanVenezuela
ArabianHeavy
NigeriaLight
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Liquefying Asphalt CementAsphalt Cement
(Bitumen Residuum)
Heatit
Suspendit in water
Thin it withsolvents
Hot-MixAsphalt
Temperature-Viscosity
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Peanut Butter
Ketchup
Chocolate Syrup
Honey
Tomato Juice
Vegetable Oil AASHTO T-245 MARSHALL MIXING TEMP. RANGE (170 +/- 20 cSt)
AASHTO T-245 MARSHALL COMPACTING TEMP. RANGE (280 +/- 30 cSt)
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Liquefying Asphalt CementAsphalt Cement
(Bitumen Residuum)
Heatit
Suspendit in water
Thin it withsolvents
Hot-MixAsphalt
CutbackAsphalt
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Cutback (Liquid) Asphalt
Rapid Curing (RC)Asphalt cement thinned with gasoline or naphthaUsed for tack and seal coats (surface applications)
Medium Curing (MC)Asphalt cement thinned with keroseneUsed for prime coats, cold-laid pavement bases
Slow Curing (SC)Asphalt cement thinned with diesel oil or gas oilsUsed for cold-laid pavement bases
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Incr
easi
ng T
hick
ness
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Cutback (Liquid) Asphalt
30
30-60
70
70-140
250
250-500
800
800-1600
3000
3000-6000
Solvent
Asphalt
Grade
Kinematic Viscosity@ 140°F (CS)
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Liquefying Asphalt CementAsphalt Cement
(Bitumen Residuum)
Heatit
Suspendit in water
Thin it withsolvents
Hot-MixAsphalt
EmulsifiedAsphalt
CutbackAsphalt
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Emulsified AsphaltWater & emulsifying agent
5-10 micron spheres of asphalt
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Emulsified Asphalt
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Emulsified Asphalt
LIMESTO
NE
SILICA
Anionic Emulsifier Cationic Emulsifier
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Emulsified Asphalt
Rapid Setting (RS or CRS)Used for surface coats, penetration macadam
Medium Setting (MS or CMS)Used for open-graded asphalt-treated base
Slow Setting (SS or CSS)Used for dense-graded asphalt-treated base
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