high float emulsions gravel seals · 2017. 5. 16. · 1 reseal $16,500.00 $15,865.38 … 8...
TRANSCRIPT
![Page 1: High Float Emulsions Gravel Seals · 2017. 5. 16. · 1 Reseal $16,500.00 $15,865.38 … 8 Levelling +Reseal $33,500.00 $24,478.12 … 15 New Cycle $62,000.00 $34,426.40 16 Reseal](https://reader035.vdocument.in/reader035/viewer/2022070209/60faf8a43b5d714a860ca17a/html5/thumbnails/1.jpg)
Jean-Martin Croteau, P.Eng.Technical Director
ColasCanada Inc.
High Float Emulsions – Gravel Seals
C-TEP/APWA Pavement Workshop – 2013 Edition
February 5th & 6th, Calgary, Alberta
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Outline
• Canadian road network
• Gravel seals
• High float emulsions
• Aggregates
• Gravel seal systems
• Placement operations
• Typical cycle
• Future Developments
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Canadian Road Network
Hard surfaced roadways 415,600 km
Gravel roadways 626,700 km
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0
50
100
150
200
250
Km of Two-lane Roadway per 1000 Inhabitants per Province/Territory
Canadian Road Network
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Gravel Seals
• Canadian version
Gravel seals with high float
emulsions where first placed on
Manitoba/Saskatchewan roadways in
the early 60’s
• Scandinavian version
Otta seals originate from the Otta
Valley in Norway where it was first
used in the early 60’s
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Binder
Graded-aggregate
Unprimed substrate
Gravel Seals
• Gravel seals
Graded-aggregate
Low viscosity binders
Medium setting
Priming not always required
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Binder
Graded-aggregate
Unprimed substrate
Binder
Chippings
Primed substrate
Gravel Seals
• Gravel seals
Graded-aggregate
Low viscosity binders
Medium setting
Priming not always required
• Chip seal
Chippings
High viscosity binders
Rapid setting
Priming normally required
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Chip Seal
Gravel Seal
Gravel Seals
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Tall oil used to manufacture high
float emulsions not only allowing
emulsification of bitumen, it also
“gels” bitumen residue.
High Float Emulsions
• Components
100 to 200 PEN binder
Tall oil
Caustic soda
Solvent
• Emulsion
Anionic
+ 62 or + 65 % residue
Solvent 1 to 15 % of vol. emulsion
• Residue
+ 1200 sec. “Float Test”
Penetration 100 to 1000
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High Float Emulsions
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100
1000
0.1 1 10
Ap
pa
ran
t V
isc
os
ity (
Pa
-s @
60
°C
)
Shear Rate (1/sec)
CRS Residue
HF Residue
High Float Emulsions
HF emulsion residues have non-Newtonian flow characteristics
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High Float Emulsions
• “High Float” test
ASTM D 139-07, AASHTO T-50
Measures the resistance to flow at
elevated temperatures
Use to determine if bitumen
residue is gelled
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High Float Emulsions
• Properties HF emulsions
Low viscosity/anionic
→ Ability to disperse
Lighter petroleum fraction
→ Ability to wet particles
• Properties of HF emulsion residues
Soft bitumen
→ Remains flexible and crack resistant
Hard binder
→ Resistant to bleeding, flushing & tracking
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High Float Emulsions
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Typical Gradations for Gravel Seals
0
10
20
30
40
50
60
70
80
90
100
0,01 0,1 1 10 100
Sieve Size (mm)
% P
assin
g
Sask. Type 119
Ontario Cl. 2
Alberta Des. 3 Cl. 16
Otta Seals (Norway)
General Grading Envelopes
Aggregates
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Gravel Seal Systems
SystemsAggregate
Chip Seals Gravel Seals
Single layer Single Single
Multiple layer Racked-in
Double
Sandwich
Cape seal
Triple
Sandwich /double
Inverted (double)
Double
Options Priming of base
Fibre-reinforced (FiberMat)
Pavement fabric reinforcement
Flush, scrub and fog seals
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THE CONCEPT
Gravel Seal Systems
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• Factors influencing selection/design
Roadway
Existing pavement
Traffic
Environment PREPARATORY WORK
SYSTEMS WITH OPTIONS
BINDER/AGGREGATE
SPRAY AND SPREAD RATE
Gravel Seal Systems
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Gravel Seal Systems
• Preparatory work requirements
Create a sound base/substrate
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Gravel Seal Systems
• Preparatory work requirements
Create a sound base/substrate
• Selection of system with options
Fibres, flush seal, single/double
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Gravel Seal Systems
• Preparatory work requirements
Create a sound base/substrate
• Systems with options selection
Fibres, single/double, flush seal
• Binder/aggregate selection
HF-100S, -150S, -250S, -350S, PMB
Aggregate grading, size
Compatibility testing
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Gravel Seal Systems
• Preparatory work requirements
Create a sound base/substrate
• Systems with options selection
Fibres, single/double, flush seal
• Binder/aggregate selection
HF-100S, -150S, -250S, -350S, PMB
Aggregate grading, size
Compatibility testing
• Spray and spread rate determination
Empirical method
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Placement Operations
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Placement Operations
• Classic operation
• Usage of steel roller
• Flush seal (sand seal)
• Sweeping (localized practice)
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Placement Operations
• Fibre option “FiberMat”
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Placement Operations
• Fibre option “FiberMat”
Direction of Application
Gravel
Chopped fibres
First layer of emulsion Second layer of emulsion
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Life Cycle Cost Analysis
Year
($/km)
Treatment CapitalDiscounted to
year 0
0 Initial $62,000.00 $62,000.00
1 Reseal $16,500.00 $15,865.38
…
8Levelling +Reseal
$33,500.00 $24,478.12
…
15 New Cycle $62,000.00 $34,426.40
16 Reseal $16,500.00 $8,809.48
...
Residual value at year 20
$53,119.05 $24,242.84
Total present worth
$121,336.55
Typical Life Cycle
• Year 0
Pulverization
Granular material
Double gravel seal
• Year 1
Reseal
• Year 8 to 12
Levelling
Reseal
• Year 15 to 20
End of cycle
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Future Developments
• Usage of bio-solvents
• Fibre-reinforcement
• Rational design method
• Breaking agents
• Wetting agents
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Jean-Martin Croteau, P.Eng.Technical Director
ColasCanada Inc.
1560 – 5555 Calgary Trail NW
Edmonton, Alberta
T6H 5P9
CANADA
Tel.: 780 989-1112
Fax: 780 989-1116
www.colascanada.ca
Contact Information
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