Rehabilitation of 1st Avenue in - Columbia, SC · PDF fileRehabilitation of 1st Avenue in NYC...
Transcript of Rehabilitation of 1st Avenue in - Columbia, SC · PDF fileRehabilitation of 1st Avenue in NYC...
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Rehabilitation of 1st Avenue in
NYC With A High Performance
Thin Overlay
SCAPA 2015 Winter Conference
Columbia, SC
January 20, 2015
Ronald Corun
Director- Asphalt Technical Services
Axeon Specialty Products
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1st
Avenue in NYC
• In 1983 NYC DOT
repaved 1st
Avenue from 72nd
St to 125th St with
18” reinforced
PCC
• Newspaper article
highlighted
paving project
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• Pavement did not meet 40 year life
• After 25 years, PCC pavement was in very poor condition
• NYC DOT spent last 5 years trying to find a fix
1st Avenue in NYC
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1st Avenue in NYC
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1st Avenue in NYC
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1st Avenue in NYC
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1st Avenue in NYC
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• Cost of total
replacement of
18” PCC
pavement
beyond NYC DOT
budget
1st
Avenue in NYC
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• Utilities beneath
the pavement
– Gas lines
– Water lines
– Sewer lines
– Steam line
1st
Avenue in NYC
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• Removing the PCC would most likely damage the utilities – NYC DOT tries not to
use compaction with vibration when paving streets
– After paving projects are completed NYC DOT tests utilities for leaks
• Funding not available to replace PCC pavement and the utilities
1st
Avenue in NYC
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• NYC is planning to improve bus service with an new bus lane on 1st Avenue and also add a bike lane
• Question – How to rehabilitate 1st Avenue?
1st Avenue in NYC
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1st
Avenue in NYC
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1st Avenue in NYC
• NYC DOT contacted
Axeon Specialty
Products (formerly
NuStar Asphalt) and
asked for suggestions
• Research at Rutgers
University had developed
a High Performance Thin
Overlay (HPTO) Mix
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HPTO Mix Design
• Mix Performance
Objectives
– Improve rut resistance
• Aggregate gradation and
quality
• Polymer-Modified Asphalt
– Improve cracking resistance
• Increased asphalt content
– Slightly gap-graded mix
– Mix design at 3% air void
target (SGC = 50 gyrations)
– Minimum 7% asphalt content
• Polymer-Modified Asphalt
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0.0
10.0
20.0
30.0
40.0
50.0
60.0
70.0
80.0
90.0
100.0
Sieve Size (mm) Raised to 0.45 Power
Pe
rce
nt
Pa
ss
ing
MD FlexGard
NJ I-5
.15
0
.07
5
.30 .60 1.1
8
4.7
5
2.3
6
9.5
0
12.5
0
HPTO & 9.5 mm Mix Gradation Plot
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Paulsboro HPTO – 5 years old
Original After 5 years
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NJ I-295 HPTO Project
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NJ I-295 HPTO Project
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NJ I-295 HPTO Project
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1st Avenue in NYC
• Search to improve HPTO performance under severe conditions by beefing up the asphalt binder
• Highly Modified Asphalt (HiMA) developed by Kraton Polymers – Specialty SBS material
with lower viscosity increase
– Allows up to 7.5% polymer loading with workability
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Distress 10”
Unmodified
6”
HiMA
Damage
Ratio
Shear
Deformation 2.05E-2 0.78E-2 38%
Compressive
Deformation 1.27E-2 0.70E-2 55%
Longitudinal
Cracking 1.31E-3 0.02E-3 1.5%
Vertical
Cracking 7.72E-4 4.41E-4 57%
Transverse
Cracking 8.65E-4 0.79E-4 9.1%
Highly Modified Asphalt
10” Unmodified Section
6” HiMA Section
Source: Kluttz; Kraton Polymers
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• 10 million ESALs applied by September 2011
• HiMA section performed better than or equal to control section despite 1.25” thinner – HiMA section has 50% of
rutting in control section
– No cracking in HiMA or control section
• Measured strain and laboratory testing indicate HiMA has 64 times the fatigue life of the control section
NCAT Test Track HiMA Section
Source: NCAT Research Synopsis; “Structural
Evaluation of a Highly Polymer-Modified Asphalt
Pavement”
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1st Avenue in NYC
• Research at Rutgers
University comparing
HPTO mix with
conventional PMA
binder and Highly
Modified Asphalt
(HiMA)
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1st Avenue in NYC
• Conventional PMA
binder had
continuous grade of
PG 80.4-27.3
• HiMA binder had a
continuous grade of
PG 95.4-31.03
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Flow Number
590
982 1,079
1,796
0
500
1,000
1,500
2,000
2,500
Axeon FlexGard (Unaged)
Axeon HiMA (Unaged)
Axeon FlexGard (Aged)
Axeon HiMA (Aged)
AM
PT
Flo
w N
um
be
r (c
ycle
s)
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Texas Overlay Tester
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Horizontal Tensile Stress due to Expansion/Contraction of PCC from Temperature
PCC PCC
Hot Mix Asphalt Overlaid on PCC
Texas Overlay Tester
Horizontal Stress/Strain is modeled using
Overlay Tester
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Texas Overlay Tester
> 5,000 4,750
2,541
1,665
-
1,000
2,000
3,000
4,000
5,000
6,000
STOA LTOA STOA LTOA
HiMA Flexgard
Ove
rla
y T
es
ter
Fa
tig
ue
Lif
e (
cycle
s)
Binder and Aging Condition
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Flexural Beam Fatigue
• Flexural Beam Fatigue Testing – Measure
number of cycles to failure
– Cycles to failure defined as stiffness = 50% of initial stiffness
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Flexural Beam Fatigue
1,000
10,000
100,000
1,000,000
10,000,000
100,000,000
100 1,000 10,000
Fati
gu
e L
ife,
Nf,
50%
(Cycle
s)
Micro-strain (ms)
Flexgard - LTOA
HiMA - LTOA
12.5mm PG76-22 - LTOA
32 k
O
k
t
150% f,E
1
ε
1kN
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1st Avenue in NYC
• HPTO mix
containing each
binder was placed
on 1st Avenue on
September 25, 2012
– HiMA placed between
100th and 101st Street
– Conventional PMA
placed between 101st
and 102nd Street
• 1 1/2” thick overlay
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1st Avenue in NYC
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1st Avenue in NYC
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1st Avenue in NYC
• Both sections
performed well
through August 2013
• NYC DOT selected
HiMA based on
laboratory testing
and field
performance
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1st Avenue in NYC
• Rehabilitation Design – Micro-mill existing PCC
pavement
– Patch areas as required
– Crack seal as required
– Place PG 76-22 tack coat and Mirafi PGMG4 fabric
– Overlay with 1 ½” HPTO mix with HiMA asphalt binder
• Added Evotherm warm mix additive to lower mix temperatures and improve workability
• Produced mix at 300°F
• Project completed September 2013
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1st
Avenue Micro-Milling
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1st
Avenue Micro-Milling
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1st
Avenue Micro-Milling
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1st
Avenue Crack
Sealing and Patching
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1st
Avenue Crack
Sealing and Patching
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1st
Avenue Tack Coat
and Fabric
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1st
Avenue Tack Coat
and Fabric
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1st
Avenue Paving –
September 2013
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1st
Avenue Paving –
September 2013
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1st
Avenue Paving –
September 2013
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1st
Avenue Paving –
September 2013
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1st
Avenue Finished Pavement
– September 2013
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1st Avenue Finished Pavement –
September 2013
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1st Avenue Finished Pavement –
September 2013
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1st Avenue Finished Pavement –
September 2013
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1st Avenue Finished Pavement
– September 2013
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1st
Avenue – November 2014
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1st
Avenue – November 2014
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1st
Avenue – November 2014
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1st
Ave @ 96th
Street - Before
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1st
Ave @ 96th
St – Nov 2014
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Summary
• Combination of HPTO mix and HiMA may provide a thin overlay solution for difficult urban pavement rehabilitations
• NYC DOT and Axeon Specialty Products will monitor pavement performance
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Questions?
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