basics of moisture damage and liquid antistripping
TRANSCRIPT
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Basics of MoistureBasics of Moisture Damage and LiquidDamage and Liquid
AntistrippingAntistripping Additives
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Where we started
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What changed?g
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Pavement Failure
• RuttingRutting• Fatigue• Moisture Damage
A i• Aging
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Physical PropertiesPhysical Properties
• Cohesion
• Adhesion• Adhesion
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CohesionCohesion
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AdhesionAdhesion
• GlueGlue
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Adhesion PromotersAdhesion Promoters
• Majority of additives used are called j yAmines
• There are some Acidic additives
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AdhesionAdhesion
• GlueGlue
S f t t (S ) B k f t i• Surfactant (Soap) Breaks surface tension
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AdhesionAdhesion
• GlueGlue
S f t t (S ) B k f t i• Surfactant (Soap) Breaks surface tension
• Polar Molecules
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AdhesionAdhesion
• GlueGlue
• Surfactant (Soap) Breaks surface tension• Surfactant (Soap) Breaks surface tension
P l M l l• Polar Molecules
• Displace water with Asphalt Cement from Surface of Aggregates
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Asphalt
Water
Dust
Rock
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How do we test for MoistureHow do we test for Moisture Damage?g
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Tests for Moisture DamageTests for Moisture Damage
TSR T t AASHTO T 283• TSR Test AASHTO T-283 (Lottman)(Lottman)
• Immersion Compression p• Hamburg Rut Tester
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Do You Test for Moisture Susceptibility?
Type of Test
TensileCompressiveRetained StabilityHamburg &TensileNone
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Tensile Strength RatioTensile Strength Ratio
TSR= Conditioned / UnconditionedTSR= Conditioned / Unconditioned
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When do we test?When do we test?
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When Do You Test for Moisture Susceptibility?
Time of Testing
Mix DesignMix Design &Mix Design &Field AcceptanceNone
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What do we use to improve resistance to moisture damage?resistance to moisture damage?
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Do You Treat HMA for Moisture Damage?
PredominantType of Treatment Used
LimeLime or liquidsqLiquidsLiquids seldomNo or very rarely
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How much adhesion promoter do we use?
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Hot Mix Asphalt Materials
~ 95% Aggregate
~ 5.0% Liquid asphalt cement (AC)
~ 0.5% Adhesion promoter
Antistripping additive is 0.5% of weight of liquid asphalt cement binder most of the time.
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One Ton Mix2000 Pounds
Asphalt content 5.0%
2000 X 0.05 = 100 pounds asphalt cement
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100 pounds AC
0.5% is adhesion promoter additivep
100 X 0 005 = 0 5 pounds100 X 0.005 = 0.5 pounds
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Are the anti strippingAre the anti stripping additives safe?
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Ai it i t d t d iAir monitoring study reported in AAPTAAPT
T j t d i Illi iTwo projects done in Illinois
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Results
Total Particulates
Diesel Fumes
A h lt H d bAsphalt Hydrocarbons
Asphalt additive < .001
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Do we have an effect on paving crews?crews?
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Are all additives the same?
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NO !!!NO !!!
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Illinois Department of TransportationBureau of Materials and Physical Research
APPROVED LIST OF HOT MIX ASPHALT ANTI-STRIP ADDITIVESAugust 3, 2007
This list supersedes the January 19, 2007 list.Standard Specifications for Road and Bridge Construction,Standard Specifications for Road and Bridge Construction,
Article 1030.04(c) (Adopted January 1,2007)
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How to prevent Moisture Damage?How to prevent Moisture Damage?
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Good mix designsGood mix designsUse of GOOD Adhesion promoters
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Good mix designsGood mix designsUse of GOOD Adhesion promoters
Good construction practices (Density)
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Good mix designsGood mix designsUse of GOOD Adhesion promoters
Good construction practices (Density)
Keep water out pavements (Drainage)Keep water out pavements (Drainage)
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