Thin Hot Mix Asphalt Surfacing System - CTEP · Thin Hot Mix Asphalt Surfacing Systems •...
Transcript of Thin Hot Mix Asphalt Surfacing System - CTEP · Thin Hot Mix Asphalt Surfacing Systems •...
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Jean-Martin Croteau, P.Eng.Manager, Quality Systems & Technical Development
Works Alberta Ltd.
Thin Hot Mix Asphalt
Surfacing System
The Western Canada Pavement Workshop – 2010 Edition
February 2nd & 3rd, Edmonton, Alberta
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Presentation Outline
• Expected characteristics of surfacing course
• Thin hot mix asphalt surfacing systems
• Dense graded mixtures
• Gap graded mixtures
• Tacking/bonding techniques
• Surface characteristics of thin surfacing course
• Objectives & constraints
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Expected Characteristics
• Safety
o adequate friction
o absence of rutting
o reduce water spray
o reduce glare
o facilitate visibility
• Comfort
o good smoothness
o reduce rolling noise
• Performance
o resist aggression
deicing agent and
winter sand
snow plow blades
o seal structure
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Thin Hot Mix Asphalt Surfacing Systems
• Thickness
o NAPA - 12.5 mm to 37.5 mm
• Systems available
o dense graded: Marshall or Superpave
o gap graded: SMA or Novachip
o low noise HMA systems
• Usages
o preventive maintenance
o surface characteristics restoration
o rehabilitation
o construction
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Gap Graded vs. Dense Graded
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Gap Graded vs. Dense Graded
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.075 .150 .300 .600 1.18 2.36 6.7 9.5 12.5 19.0 25.0.075 .150 .300 .600 1.18 2.36 4.75 9.5 12.5 19.0 25.0K J I H G F E D C B A
Stone mastic asphalt
Fine-graded mix
Coarse-graded mix
0/6 mm SMA
PCS
Fine Coarse
Gradations
100
90
80
70
60
50
40
30
20
10
0
% P
ass
ing
Sieve size raised to 0.45 power
Max. density line
NMAS
19 mm SMA
Porous asphalt
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Dense Graded Mixtures
• Conventional technologyo mix-design development
Superpave or Marshall
o smaller NMAS (Nominal Maximum Aggregate Size)
typically < 10 mm
• Surface characteristics o smooth surface
well suited for urban and suburban settings
o reduction in rolling noise
uniform surface texture
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Dense Graded Mixtures
• Engineering of dense graded small size NMAS
o bitumen – neat and polymer-modified asphalt
o mineral aggregate - high crushed count
o NMAS: 4.75, 5.0, 6.3 and 9.5 mm
• Mix-design method
o Superpave or Marshall
o performance-based rutting criteria (if required)
• Application
o require tack-coating
o thickness applied ~ 20 to 30 mm
o placed using conventional equipment
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Expected Mixture Properties
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Dawson City, Yukon
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Gap Graded Mixtures
• Heavy duty surfacing systemo improve resistance to permanent deformation
strong aggregate interlock
o excellent durability
binder-rich material
• Premium surface characteristics o excellent visibility
more water held within the mixture surface texture
o reduction in rolling noise
surface texture is deep and uniform
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SMA – 0/6 mm
• Engineering of SMA 0/6 mm o bitumen - polymer-modified
o mineral aggregate - high crushed count
• Mix-design methodo mainly gyratory compactor
o performance-based rutting criteria - wheel tracking device
• Applicationo require tack-coating
o minimum thickness applied ~ 20 mm
o placed using conventional equipment
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Rut Testing Device
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Typical Mixture Properties
Criteria JMF Requirements
Bitumen content/volume
PG70-28P 5.8 % -
Vbe 12.6 % -
Volumetric properties
Nini (10 Gyr.) 14.5% 11.0 %
Ndes (80 Gyr.) 5.5 % 4.0 to 7.0 %
Nmax (200 Gyr.) 2.4 % 2.0 %
VMA 18.1 % 17.0 %
VCA 38.2 % < 44.8*
Moisture resistance & draindown properties
TSR 92.8 % > 70.0 %
Draindown 0 < 0.3 %
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Criteria JMF Requirements
1,000 cycle @ 60ºC 4.5 % < 10 %
3,000 cycle @ 60ºC 5.2 % < 20 %
30,000 cycle @ 60ºC 7.3 % -
Rutting Resistance Characteristics
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After Construction
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One Year Later
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Surface Texture
1 week 1 year
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Four Years Later
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Novachip
Novachip is a thin
pavement surfacing system
which involves the
embedment of a gap-graded
HMA in an uniformed thick
bond coat. The bond-coat
migrates upwards one
third of the thickness of
the HMA resulting in an
excellent bond with the
underlying surface.
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Novachip
Surface of
Bounded
Wearing
CourseSurface of
Bond-Coat
Existing
Surface
Total Depth - 15 mm
Bond-Coat Height – 5 mm
Agg. Max. Size - 10 mm
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Novachip
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Novachip
• Materialso bitumen – preferably polymer-modified
o mineral aggregate – high crushed count
o bond coat – polymer-modified emulsion
• Mix-design methodo strong focus on film thickness
• Types - 0/6 mm, 0/10 mm & 0/14 mm
• Applicationo thick polymer-modified bond coat
o minimum thickness applied ~ 15 mm
o placed using specific equipment
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HMA is placed in a single pass
with a specialized paver that
combines the functions of a
distributor and HMA lay down
machine
Once place the HMA is seated
in bond-coat using steel rollers
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Tacking/Bonding Techniques
• Provide lamination i.e. bonding between
two layers of HMA
o pavement structural design aspects
essential for long term performance
prevent ingress of water
• Facilitate placement for thin HMA
o anchors mix during lay down and compaction
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Paving
Conventional Paving Thickness
Asphalt Institute Recommendation
3 to 4 x NMAS
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Paving
fscreed
fsubstrate
fscreed < fsubstrate
“fsubstrate “ may be influence by the type, quality and performance of tack/bond coat
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Tacking/Bonding Techniques
• Novachip like system
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Tacking/Bonding Techniques
• Trackless tack-coat
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Tacking/Bonding Techniques
• SAMIs
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HMA
Fibre-reinforced bond coat with protective chippings - SAMI
Fibre-Reinforced Membrane
Substrate
Binder & Fibres
Protective Chippings
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Tacking/Bonding Techniques
• Asphalt emulsion
o no solvent
• Engineered for application
o low viscosity - uniformity
o heavier residual - thin overlays
o polymer-modified - better bond
o additives - fast break
o hardest of residual binder – tracklessness
o fibers – cracking mitigation
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Surface Characteristics
• Surface friction
o usage of a good aggregate
o skid number of 50
• Surface drainage
o macro-texture depth of 0.6 to 1.0 mm
• Smoothness
o placed with modern paving and compaction equipment
• Rutting defects
o wheel tracking laboratory tested for rut resistance
• Rolling noise reduction
o negative texture
o short surface wave length (NMAS < 10 mm)
o high surface voids
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Objectives & Constraints
Thin HMA systems
Dense Graded Mixes < 8 mm
SMA 0/6 mm
SMA 0/10 mm
Novachip 0/6 mm
Novachip 0/10 mm
Low noise HMA systems**
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Summary
• Suitable for all volume
highways
• Rapid operation
• No chip loss
• Resistant to mat
damage caused by
turning and braking
• Reshaping capacity
• High skid resistance
• Aggressive
macrotexture
• Strong adhesion to
existing pavement
• Reduced rolling noise
• Bond-coat seals
existing surface
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Thank you