Understanding and Using Asphalt Emulsion - Jac… · Need curing period to develop tensile strength...
Transcript of Understanding and Using Asphalt Emulsion - Jac… · Need curing period to develop tensile strength...
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Understanding and Using
Asphalt Emulsion
Emulsion 101 by Jack Dougherty
Rocky Mountain West Pavement Preservation
Peppermill, Reno 10-5-2011
a subsidiary of
U S A A L O N
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Why is emulsion used?
Liquid
Saves Energy
Aggregate coating
No fire hazard
Environmentally clean
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Asphalt Emulsion Advantages
Low Storage and application temperature
Construction versatility
Reduced energy requirement
Reduce air pollution
High mix production rate
High seal coat stone retention (min. bleeding)
High natural adhesion
Wide grade selection
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Disadvantages
Lack of freeze resistance
Some types may suffer early rain damage
Need curing period to develop tensile strength
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Artists’ Perspective
Oil Base Type of oil and quantity
Lacquers solvent/ evaporation rate
Latex Water
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Asphalt Technology Perspective
HOT APPLIED Visco-elastic / VGO
CUTBACKS Solvents /Evaporation rate
EMULSIONS Surfactants/ water
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Asphalt Cement Can Be Liquefied By:
Heat
Blending With a petroleum Solvent
Emulsifying with water (and an Emulsifying
Agent)
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Emulsified Asphalts-Production
& Use
What are emulsified asphalts?
How is emulsified asphalt manufactured?
Uses of emulsified asphalts
Construction
Maintenance
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Chemistry Of Asphalt Emulsions
Emulsified asphalt is a dispersion of asphalt cement particles in water with the aid of an emulsifying agent (or “system”)
The asphalt cement is dispersed in the liquid medium in the form of tiny droplets ranging from about one to ten microns in diameter
In the manufacturing process agitation and surface active agents are required for emulsification
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Type of Emulsions
Cationic:
Asphalt droplets having a positive (+) charge
Anionic:
Asphalt droplets having a negative (-) charge
Nonionic: Neutral Charge on asphalt particles
Emulsion type determined by emulsifier chemical
- Anionic
+Cationic
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Specifications
Emulsified Asphalt
AASHTO M140
ASTM D977
Anionic
Nonionic
Some Cationic
Cationic Emulsified
Asphalt
AASHTO M208
ASTM D2397
Cationic only
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Chemistry of Asphalt Emulsions
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Emulsion Breakage
Evaporation
Chemical
Surface contact
Temperature
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Emulsion Deposition
Deposited Asphalt
Aggregate
Emulsifier
Asphalt Emulsion Droplet
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Liquid State:
Possess the handling and ecological advantages of
water
Cured State:
Possess the adhesive durability and water resistant
properties of a paving asphalt
The Manufacture Of Asphalt
Emulsions
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Emulsion Plant
Blender
Mill
Asphalt Emulsion
Water
Emulsifiers
Asphalt Cement
Hard
Asphalt
blending
stock
Soft
Asphalt
blending
stock
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Process Flow Diagram Chemicals
Water
Emulsion
Water Tank
T
Asphalt
Charge
Tank
Recirculation
Pump
Asphalt
Emulsion
Tank T
T
Mill
P
T
Pump
Loading
Line
Additive
Pump
F F
Pump
F
T
P
Flowmeter
Temperature measured
Pressure measured
Agitator
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CHARLOTTE® COLLOID MILLS
FOR ASPHALT EMULSIONS
G100 25 tph with 100 HP motor
G125 40tph with 125 HP motor
Industrial head (2 pieces)
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Siefer Emulsion Mill
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Lab Mill
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Factors That Affect Emulsification
Asphalt (caustic treated-Recycled lube oil treated0
Soap Type / Soap Content
pH
Asphalt Temperature
Soap Temperature
Mill Gap
Back Pressure
Discharge Temperature
Water hardness
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Factors effecting particle size
Temperature of components
Type and quantity of surfactant
Mill clearance
Mill “dwell time”
Back pressure
Ionic strength of water phase
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Adjusting Emulsion Viscosity
Low Viscosity
High Viscosity
Increase Mono-amine
Increase Residue
Use Thickener
Decrease mill gap
Rise Asphalt Temp
Rise Soap Temp
Check pH
Use Amido Amine
Use CaCl / NaCl
Increase mill gap
Use “Durco”
Lower Residue
Lower Asphalt Temp
Lower Soap Temp
Check pH
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Factors Effecting Sieve
Recycled Lube Oil in asphalt †
Inadequate saponification or not enough surfactant
Shear sensitive emulsifiers
High shearing mixers
High shear pumps
Mill Gap
Boiling on Discharge
Hard water
Hot spots in tank or live steam
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Factors Effecting Storage
High settlement
Low Residue
Excess or insufficient Acid or caustic
Too much salt
Large particle size
Insufficient surfactant –particle charge
Storage Temperature
Hot spots
Too cold
Surface area
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Factors Effecting Setting / Breaking
Rate
More surfactant longer break longer setting time
Coating reduced with lower surfactant but increase
set and break.
Non ionics slow breaking and setting time
Lignosulfonates and Aminated lignums slow
breaking and setting time.
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Keys to making “Good Soap”
Lignins (Indulin SAL, Indulin C, Polyphon, W-5 W2 etc If in powder form add to warm water Then add Acid
Tall Oils Add half of the caustic Then add to 130F Water The TO . Then the
remaining caustic
Fatty Amines Same as Tall Oil
Nonionics Many inactive above 140 F
Correct pH 3.5 pH Minimum for Amines (except Quats)
10+ for Anionic Tall Oil or Tallow – excess critical in High Floats
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Anionic Materials
Materials
Tall Oil
Sodium Hydroxide
Potassium Hydroxide
Sodium Chloride
Methyl Oleate
Tallow
Vinsol Resin
Sodium Lignosulfonate
Alpha Olefin Sulfonate
Clay
Function
RS/MS/HF emulsifier
Create soap
Create soap
Reduce emulsion viscosity
HFRS-2 additive
HFRS-2 additive
Emulsifier/stabilizer for MS & SS
Stabilizer for SS
QS-h emulsifier
Reduces settlement
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Cationic Materials
Materials
Amines, Mono- or di-
Amidoamine
Quaternary ammonium salts
Ligniamine
Hydrochloric acid
Calcium chloride
Function
CRS, CMS emulsifier
CRS, CMS, CQS emulsifier
CRS, CMS, CQS emulsifier
CSS emulsifier
Create soap
Reduce emulsion viscosity
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Emulsion Grades Grade Cationic Anionic
Rapid Setting CRS RS
Mixing CMS MS
Slow Setting CSS SS
High Float
HFRS
HFMS
Control Setting CQS QS
Different grades have different usage in
highway construction
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Typical Asphalt Emulsion
Formulation
CRS-2:
Asphalt: 67%
F.A. Diamine: 0.2%
HCL: 0.1%
Water: 32.7%
RS-2:
Asphalt: 65%
Tall Oil: 0.2%
NaOH.: 0.04%
Water: 34.76%
CMS-2S:
Asphalt: 62%
F.A. Diamine: 0.4%
HCL: 0.2%
Naphtha: 12%
Water: 25.4 %
SS-1h:
Asphalt: 60%
Vinsol Resin: 0.75%
Na Ligno-SO4: 0.75%
NaOH: 0.09%
Water: 38.41 %
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Emulsion Tests
Emulsion Property
Emulsion handling
Emulsion stability
Emulsion type
Emulsion grade
Asphalt grade
Asphalt content
Test Procedure
Viscosity
Sieve, storage stability
Particle charge
Classification, mixing test, cement mixing
Penetration, Original DSR (ADOT)
Distillation or Evap
Plus specification
Softening pt
Torsional Recovery
Latex/Polymer %
Other per agency specification
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Why surface treat
To seal
To rejuvenate
To reinforce
To provide skid resistance
To provide demarcation
To provide improved visibility
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General Uses of Asphalt Emulsions
Rapid setting (RS, CRS, or HFRS)
Chip seals
Surface treatments
Sand seals
Penetration treatments
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General Uses of Asphalt Emulsions
Medium setting (MS, CMS, or HFMS)
Plant mix (cold or hot)
Seal coat and surface treatments
Tack coat
Crack sealing
Road mix
Patching mix (for immediate use)
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General Uses of Asphalt Emulsions
Slow setting (SS, CSS)
Cold Plant mix
Road mix
Tack coat (diluted)
Fog seal (diluted)
Dust palliative
Mulching
Slurry seal coat
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QS slurry seal
Types: Cationic
Emulsion Plus Mix Aid = QS slurry
Fast set
No mixing stability Retards Set
Anionic
Emulsion Plus Setting = QS slurry
Long Mixing Agent
Cycle without
Setting agent Control Set
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