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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.
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