Asphalt Paving Materials
Asphalt Paving Materials
Chapter 6 Bituminous Materials
Bituminous Materials
Natural Tar & Petroleum Asphalts Pitch Asphalts
(late 1800s)(early 1900s) (1900s)
CIVL 3137 2 Natural Asphalt
Rock Asphalt Asphalt Sand Native Asphalt
CIVL 3137 3 Rock Asphalt
CIVL 3137 4 Rock Asphalt
ROCK ASPHALT & OIL SHALE IN KENTUCKY
CIVL 3137 5 Asphalt Sands
CIVL 3137 6 Asphalt Sands
CIVL 3137 7 Asphalt Sands
CIVL 3137 8 Native Asphalt
CIVL 3137 9 La Brea Tar Pits
CIVL 3137 10 Native Asphalt
CIVL 3137 11
Source: Geological Society of Trinidad and Tobago (www.gstt.org) Native Asphalt
CIVL 3137 12 Native Asphalt
CIVL 3137 13
http://www.flickr.com/photos/striderv/4314238332/lightbox/ Native Asphalt
CIVL 3137 14 Native Asphalt
CIVL 3137 18 Bituminous Materials
Bituminous Materials
Natural Tar & Petroleum Asphalts Pitch Asphalts
(late 1800s)(early 1900s) (1900s)
CIVL 3137 19 Chickamauga Coking Ovens
CIVL 3137 20 Dunlap, TN Coking Ovens
CIVL 3137 21 Bituminous Materials
Bituminous Materials
Natural Tar & Petroleum Asphalts Pitch Asphalts
(late 1800s)(early 1900s) (1900s)
CIVL 3137 23 Crude Oil Chemistry
Oils (Hydrocarbons)
Resin-coated asphaltenes
CIVL 3137 24 Crude Oil
Light Crude Heavy Crude
“oils” “oils” “oils” “oils”
Aromatic Saturated Hydrocarbons Hydrocarbons(oils)
CIVL 3137 25 Petroleum Distillation
Butane & Propane 1-4 Carbons Distillation Column Gasoline 1-4 Carbons
Naphtha 5-10 Carbons
Kerosene 10-14 Carbons Crude Diesel Oil 15-38 Carbons
550ºC Tube Heater Bitumen Residuum 38-70 Carbons
CIVL 3137 26 Crude Oil
Gasoline Kerosene 6 Lt. Gas Oil 7 21 33
Hv. Gas Oil 26 14
10 20
28 16 Bitumen 58 Residuum
27 30
Boscan Arabian Nigeria Venezuela Heavy Light
CIVL 3137 28 Liquefying Asphalt Cement
Asphalt Cement (Bitumen Residuum)
Heat Thin it with Suspend it solvents it in water
Hot-Mix Asphalt
CIVL 3137 29 Temperature-Viscosity
Peanut Butter
Ketchup Chocolate Syrup
Honey
AASHTO T-245 MARSHALL COMPACTING TEMP. RANGE (280 +/- 30 cSt)
Tomato Juice Vegetable Oil AASHTO T-245 MARSHALL MIXING TEMP. RANGE (170 +/- 20 cSt)
CIVL 3137 30 Liquefying Asphalt Cement
Asphalt Cement (Bitumen Residuum)
Heat Thin it with Suspend it solvents it in water
Hot-Mix Cutback Asphalt Asphalt
CIVL 3137 31 Cutback (Liquid) Asphalt
Rapid Curing (RC) Asphalt cement thinned with gasoline or naphtha Used for tack and seal coats (surface applications) Medium Curing (MC) Asphalt cement thinned with kerosene Used for prime coats, cold-laid pavement bases Slow Curing (SC) Asphalt cement thinned with diesel oil or gas oils Used for cold-laid pavement bases
CIVL 3137 32 Increasing Thickness
CIVL 3137 33 Cutback (Liquid) Asphalt
Grade 30 70 250 800 3000
Solvent
Asphalt
30-60 70-140 250-500 800-1600 3000-6000 Kinematic Viscosity @ 140°F (CS)
CIVL 3137 34 Liquefying Asphalt Cement
Asphalt Cement (Bitumen Residuum)
Heat Thin it with Suspend it solvents it in water
Hot-Mix Cutback Emulsified Asphalt Asphalt Asphalt
CIVL 3137 35 Emulsified Asphalt
Water & emulsifying agent
5-10 micron spheres of asphalt
CIVL 3137 36 Emulsified Asphalt
CIVL 3137 37 Emulsified Asphalt
Anionic Emulsifier Cationic Emulsifier LIMESTONE SILICA
CIVL 3137 38 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
CIVL 3137 39 CIVL 3137 40 CIVL 3137 41