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CE332 Test 3 - 01

Introduction to Asphalt

TermDefinition
What is Asphalt Binder? By-products of petroleum production
4 Main used of asphalt binder -Paving -Roofing -Pipe coating -Waterproofing
Asphalt binder composition and % by MASS Asphalt binder + Aggregate + Air voids (+ Additives) -Aggregate (95%)
Asphalt binder composition and % by Volume -Aggregate (85%) -Binder (10%) -Air Voids (5%)
How is asphalt produced and at what temperature? - Distillation, "boiling off" lighter fractions of crude oil - 800 F or higher
Asphalt Vs Tar -> Asphalt (5) - Viscoelastic! - By-product of Petroleum - Good Paving material - Less Temp dependent - Does not produce as many harmful vapors
Asphalt Vs Tar -> Tar (5) - Viscoelastic! - By-product of Coal - Poor Paving material - More Temp dependent - Produce harmful vapors
Asphalt chemical composition (3) - Mostly carbon and Hydrogen - Heteroatoms: Adds polarity to the molecules - Heteroatoms greatly change the behaviors of asphalt
4 Functional Groups of Asphalt With increasing polarity: more solid behaviors and higher modulus -Saturates -Aromatics -Resin -Asphaltenes
Asphalt behavior is dependent on (3): - Temperature - Time of loading - Age Asphalt is viscoelastic!
Asphalt behavior: Viscous Acts like a fluid when: - High temperature - Sustained loads
Asphalt behavior: Elastic Acts like a solid when: - Low temperature - Rapid loads
Asphalt behavior: Aging - Short term: Volatilization, lost of low density components during mixing and construction - Long term: Oxidation, occurs during mixing, construction and throughout service life Both result in a more elastic/solid behaviors (More Brittle!)
Liquifying Asphalt binder: Heat - Most common - Mix of asphalt binder and Aggregate to produce 'asphalt concrete'
Liquifying Asphalt binder: Emulsify - Combination of Water+Asphalt+Emulsifying agents (soaps) - Ambient Temperature - Used on low traffic - Once placed, water and asphalt break. - Water is evaporates and absorbed, leaving the binder to glue the aggregate
Created by: BrendaTovar3223
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