Resurfacing roads using ultra high-pressure watercutting

Resurfacing roads using ultra high-pressure watercutting

Resurfacing roads using ultra
high-pressure watercutting
REAAA Roadshow September 2008
Jeff Waters
Surfacing Engineer
Fulton Hogan
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Outline
• Background to Research Project
– UHP Watercutting as a maintenance treatment
– Laboratory Experiment
• LTNZ Research Project
– Sites and Site Selection
– Performance
– Conclusions
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Background
• TNZ – Safety Priority on Roads
• T/10 Skid Resistance Specification
• Resealing seals that were friction and/or
texture deficient
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Why surface texture is important.
Tyre Rubber
COMPRESSION
STONE
Rubber-Stone Adhesion
(Adhesion Friction)
STONE
DECOMPRESSION
STONE
Deformation leading to Hysteresis
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(Hysteretic Friction)
UHP Watercutting as a
Maintenance Treatment
• Preseal repairs
– Removing excess binder
– Replaces burning
• SCRIM+ identified deficient sites
– Retexturing texture deficient sections
– Treating friction deficient sections?
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Preseal repairs
• Removing excess binder
– Increases seal life
– Consistent texture makes it simpler to reseal
• Same result as a texturising seal
• Why reseal?
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Bealey Bridge Site
Photo taken two years after sealing
Not Watercut
before resealing
Watercut
before
resealing
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Northern Motorway Site
View north from uncut section Feb 06
Section 1
Section 2
Uncut
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Northern Motorway Watercutter Trial Site Data
0.70
2.00
1.80
0.65
1.60
0.50
0.45
1.40
1.20
1.00
MPD
MSSC
0.55
W atercut Section 3 August 2002
W atercut Section 1 January 2002
0.60
0.80
0.60
0.40
0.40
0.35
0.30
0.20
Section 1 Friction (Re-texturised Jan 02)
Section 2 Friction (untreated)
Section 3 Friction (Re-texturised Aug 02)
Section 1 Texture (Re-texturised Jan 02)
Section 2 Texture (untreated)
Section 3 Texture (Re-texturised Aug 02)
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
0.00
2008
SCRIM Survey / Year
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UHP Watercutting
removing excess binder
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How the UHP cuts binder
from a chipseal surface.
• 36000psi
• Water velocity
1.5 mach
• Water needles
are so fine that
all energy is
dissipated once
they hit stone,
• The needles do
not burrow
under and
dislodge chip.
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Early Monitoring Sites
Early W atercu t Site Mo n ito rin g
90
2.5
N ew S u rface
BPN 1
Texture 1
BPN 2
Textu re 2
80
N ew S urface
70
60
1.5
50
40
1
30
20
0.5
Average Surface Friction / BPN
Average Texture Depth / mm
2
10
0
0
B efo re
23/02/2001
17/09/2001
04/02/2001
30/07/2002
Da te Te ste d
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Microtexture Improvement
Was the process cutting the stone?
• Laboratory Experiment
• Tai Tapu Trials
• Land Transport New Zealand Research Project
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Laboratory Experiment
Type of Stone
[and Source]
Skid Resistance
Prior to Polishing
(Lab PSV Units)
PSV
Control
61
52
66
Greywacke (Uriti)
55
85
Blue Rock (Hard Rock)
[Plimmerton]
55
67
64
81
Brown Rock (Overburden)
[Plimmerton]
Skid Resistance
Post UHP Watercutting
(Lab PSV Units)
Greywacke (Pound Rd)
72
57
70
Greywacke (Pound Rd)
20% rounded faces
72
58
71
Control
62
53
68
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Tai Tapu Trial Site
Not
treated
Treated
Photo taken November 2006 3 years after trial
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Tai Tapu Trial Test Data
Process Trial Results
95
90
Ave Surface Friction / BPN
85
3
Skid - Trial 1
Skid - Trial 2
Skid - Trial 3
Texture - Trial 1
Texture - Trial 2
Texture - Trial 3
2.5
2
80
75
1.5
70
65
1
Ave Texture Depth / mm
100
60
55
0.5
50
45
0
Before Watercutting
After Watercutting
After Repeat Watercutting
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Land Transport New Zealand
Research Project:
Watercutting – Investigating
the Lifecycle of Water Cutter
Rejuvenation of Aggregates
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Reasons for Project
•
•
•
•
Does it improve the microtexture?
How long does the improvement last?
Sustainability
Recycling the surface
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3&4
9&10
6,7&8
2
1
5
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Site Selections.
• The 10 Sites selected were friction but not
texture deficient.
• Varied climate: North - South
• Varied Aggregate: Greywacke, Schist,
basalt, sandstone, gneiss.
• Varied Surfacing types: single coat, two
coat, AC, OGPA.
• Various geometry and traffic levels.
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Watercutting Tunnel Hill Site.
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Watercut Surface - Tunnel Hill Site.
Before
After
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Tunnel Hill Surface Friction
Tunnel Hill Left Lane RV Data
Threshold Value
0.35
2003
New Oamaru Shingle Quarry Grade 5
Chipseal
0.3
2004
2005
Watercut Section
2006
New Balclutha Quarry Grade 5 Chipseal
0.25
Reduced Value
0.2
0.15
0.1
0.05
0
14090
14070
14050
14030
14010
13990
13970
13950
13930
13910
13890
13870
13850
13830
13810
13790
13770
13750
13730
13710
13690
13670
13650
13630
13610
13590
13570
13550
13530
13510
13490
13470
-0.05
-0.1
-0.15
Measurement Location
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Watercutting Refreshed
the Microtexture
Whangamoa Saddle Surface before and After
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Whangamoa Saddle Reduced Value Data
Whangamoa Saddle RL RV Data
0.3
Threshold Value
New Grade 3 Chipseal
0.2
2003
2004
Watercut Section
2005
Macadam
2006
New Grade 3/5 Chipseal
MSSC Reduced Values
11
7
11 90
8
11 10
8
11 30
8
11 50
8
11 70
8
11 90
9
11 10
9
11 30
9
11 50
9
11 70
9
12 90
0
12 10
0
12 30
0
12 50
0
12 70
0
12 90
1
12 10
1
12 30
1
12 50
1
12 70
1
12 90
2
12 10
2
12 30
2
12 50
2
12 70
2
12 90
3
12 10
3
12 30
35
0
0.1
0
-0.1
-0.2
-0.3
-0.4
Measurement Location
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Te Atatu Griptester Data
T e Atatu G riptester Microtexture D ata
0.90
Be fore W a te rcutting
0.80
Afte r W a te rcutting
7 M onths Afte r W a te rcutting
Average Microtexture / Gripnumber
0.70
13 M onths Afte r W a te rcutting
0.60
16 M onths Afte r W a te rcutting
23 M onths Afte r W a te rcutting
0.50
0.40
0.30
0.20
0.10
0.00
LW P
M id
Untre a te d OG P A
RW P
LW P
M id
W a te rcut AC10
RW P
LW P
M id
RW P
SMA
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Minimal Change in Texture
Tunnel Hill SCRIM+ Macrotexture Data
3.00
2003
2004
2005
2006
A v e ra ge Te x ture / M P D
2.50
2.00
1.50
1.00
0.50
LL LWP LL Mid LL RWP RL LWP RL Mid RL RWP LL LWP LL Mid LL RWP RL LWP RL Mid RL RWP LL LWP LL Mid LL RWP RL LWP RL Mid RL RWP
Oamaru G5
Watercut
Balclutha G5
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Conclusions
•
•
•
•
•
•
Watercutting improves the microtexture and macrotexture of worn
surfaces effectively recycling the surfacing.
This treatment has more than doubled the life of some chipseals that
required resurfacing due to failing surface friction and texture
requirements.
An aggregate that has polished and rounded due to the high
demands of the site can repolish within a year.
Fresh aggregate from the same source can polish at a similar or
faster rate.
Using the UHP to refresh the microtexture of polished stone can last
more than 5 years.
Watercutting does not sharpen up rounded edges on worn surfaces.
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Acknowledgements
•New Zealand Transport Authority
•Fulton Hogan Ltd
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A Fulton Hogan Powerpoint Presentation
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