LTPP and Pavement Preservation
LTPP and Pavement Preservation MWPPP Annual Meeting Kansas City, Missouri Monday – September 28, 2015 Gonzalo Rada, Ph.D., P.E. Amec Foster Wheeler E&I, Inc. Principal Investigator
Agenda 1. Background 2. Overview of Experiment Approach & Key Considerations 3. Experimental Designs & Project Layouts
2
1. Background
3
LTPP Mission Increase pavement life by investigation of various designs of pavement structures and rehabilitated pavement structures, using different materials and under different loads, environments, subgrade soil, and maintenance practices “Understand how pavements behave and why they behave as they do” 4
Project Objective Design pavement preservation experiments for the LTPP program
Enable LTPP to provide short- and long-term performance data on pavements relative to preservation technology Verify preservation as a viable technology in extending pavement life Document impacts of preservation to enable development and implementation of important products and tools
Project Activities Phase I • • •
Expert Task Group (ETG) Experiment Designs Materials Sampling & Testing Plans
Phase II • • • •
Performance Monitoring Requirements Construction Requirements for RSCs Other Data Collection Needs Technical Support & Marketing
Expert Task Group (ETG) Provide review/feedback throughout development of experiment Anita Bush (Nevada DOT) Colin Franco (Rhode Island DOT) Morgan Kessler (FHWA) David Luhr (Washington State DOT)
Magdy Mikhail (Texas DOT) Jim Moulthrop (FP2) Larry Scofield (IGGA) Roger Smith (Texas A&M University)
2. Overview of Experiment Approach & Key Considerations
8
LTPP Pavement Preservation Experiments SPS-11 AC Pavement Preservation Study SPS-12 PCC Pavement Preservation Study Two experiments; consistent with other LTPP experiments 9
Experimental Approach Segregate treatment types and pavement project locations into discrete groups Apply same preservation treatment, at different times, on same pavement structure LTPP focus is on timing/distress propagation rates, while NCAT/MnROAD studies and others focus on treatment comparisons… LTPP and NCAT/MnROAD studies complement / supplement each other 10
Trea t
cti on
men t Te st (6 ye Section a rs) 4
men t Te st (2 ye Section a rs) 2
es t S e
men t Te st (0 ye Section a rs) 1
men t Te st (4 ye Section a rs) 3
men t Te st (8 ye Section a rs) 5
trol T
Trea t
Con
Trea t
Trea t
Trea t
Example SPS-11 Project
6 test sections – 1 control (no overlay) and 5 treatment sections:
Traffic
11
Preservation Treatments AC Pavements (SPS-11) • Thin HMA overlays (< 1”) • Chip seals • Micro Surfacing PCC Pavements (SPS-12) • • •
Diamond grinding & DBR Joint sealants Joint penetrating sealers
Pavement Types SPS-11: • AC overlay of existing AC pavement (AC/AC)
SPS-12 : • Original jointed plain concrete pavement (JPCP)
13
Climate Thresholds: Precipitation of 20 inches/year Freezing Index of 150°F-days/year MERRA data
14
Traffic SPS-11 experiment considers both volumes and ESALs, while SPS-12 only considers ESALs
Vehicles per Day
Annual ESALs 100,000 200,000 300,000 400,000 500,000 600,000 700,000 800,000 > 900,000 1,000 2,000 3,000 4,000 5,000 6,000 7,000 8,000 > 9,000
LOW HIGH
15
Replicates, Repeats & Supplemental Replicates: Two per experimental cell; will depend on funding Repeat: Control test section plus test sections that have not received treatment Supplemental: Highly encouraged; will be supported and monitored by LTPP 16
3. Experimental Designs & Project Layouts
17
Dry
No Freeze
Freeze
No Freeze
Sub-Experiment / High Treatment
Low
High
Low
High
Low
High
Low
Tr af fic
Te m
Freeze
pe ra tu re
M
Wet
ois tu re
SPS-11 Matrix
Thin AC Overlay Chip Seal Micro-Surfacing
18
Trea t
cti on
men t Te st (6 ye Section a rs) 4
men t Te st (2 ye Section a rs) 2
es t S e
men t Te st (0 ye Section a rs) 1
men t Te st (4 ye Section a rs) 3
men t Te st (8 ye Section a rs) 5
trol T
Trea t
Con
Trea t
Trea t
Trea t
Typical SPS-11 Layout
Traffic
19
Dry
No Freeze
Freeze
No Freeze
Treatment
High
Low
High
Low
High
Low
High
Low
Tr af fic
Te m
Freeze
pe ra tu re
M
Wet
oi stu re
SPS-12 Matrix
Diamond Grinding & Dowel Bar Retrofit Joint Sealant Joint Penetrating Sealers
20
ond Gr BR ( inding 5 ye ars)
ond Gr BR ( inding 0 ye ars)
&D
ond G BR ( rinding 10 y ea rs )
Diam
ond G rin d (1 0 year ing s)
Diam
&D
Diam
ond Gr (0 y inding ea rs )
Diam
trol T Sect es t ion
Con
&D
Diam
ond Gr (5 y inding ea rs )
Diam
Diamond Grinding & DBR
Traffic
21
Se a lan @ 5 t Rep la c Ye a r Int ed erva ls
Se a lant 5 Ye Ca pped a r In @ terv als
Con trol :S kep ealant t As -Is
Con trol :S Mai ealant nta i ned
trol : Sea No lant
Con
Se a lant R @1 0 Ye ep la ced a r In terv als
Se a lant 10 Y Ca pped ear I nte @ rval s
Joint Sealant
(Cap/Replace Sealant)
Traffic
22
t Ye ar Re-A 0; Do N ot pply
Se a ler a
Se a le App r a t Ye ar ly @ 2 ye 0; Rear In terv a ls
: J oi Yea n t Seal Mai r 0, bu an t @ t nta i ned No t ; No sea l er
Con trol
Con t ro Mai l: J oin t nta i Se a l ned ; No an t sea l er
Con trol :N Sea lant o Joi n t (rem pres o ent) ; No ve if Sea ler
t Ye ar Re-A 5; Do N ot pply
Se a ler a
Se a le App r a t Ye ar ly @ 5 ye 5; Rear In terv a ls
Penetrating Sealer (Silanes or Siloxanes)
Traffic
23
50 ft 500 ft
Buffer Area
Test Section
Sampling Area
Buffer Area
100 ft
Sampling Area
Typical Test Section 50 ft 100 ft
24
Summary Phase I: Experiment Designs and MS&T Plans will be completed shortly Phase II: has been approved and work will commence shortly Project Schedule: construction and data collection guidelines will be completed by next fall and, once done, will start to recruit projects 25
26
Agenda 1. Background 2. Overview of Experiment Approach & Key Considerations 3. Experimental Designs & Project Layouts
2
1. Background
3
LTPP Mission Increase pavement life by investigation of various designs of pavement structures and rehabilitated pavement structures, using different materials and under different loads, environments, subgrade soil, and maintenance practices “Understand how pavements behave and why they behave as they do” 4
Project Objective Design pavement preservation experiments for the LTPP program
Enable LTPP to provide short- and long-term performance data on pavements relative to preservation technology Verify preservation as a viable technology in extending pavement life Document impacts of preservation to enable development and implementation of important products and tools
Project Activities Phase I • • •
Expert Task Group (ETG) Experiment Designs Materials Sampling & Testing Plans
Phase II • • • •
Performance Monitoring Requirements Construction Requirements for RSCs Other Data Collection Needs Technical Support & Marketing
Expert Task Group (ETG) Provide review/feedback throughout development of experiment Anita Bush (Nevada DOT) Colin Franco (Rhode Island DOT) Morgan Kessler (FHWA) David Luhr (Washington State DOT)
Magdy Mikhail (Texas DOT) Jim Moulthrop (FP2) Larry Scofield (IGGA) Roger Smith (Texas A&M University)
2. Overview of Experiment Approach & Key Considerations
8
LTPP Pavement Preservation Experiments SPS-11 AC Pavement Preservation Study SPS-12 PCC Pavement Preservation Study Two experiments; consistent with other LTPP experiments 9
Experimental Approach Segregate treatment types and pavement project locations into discrete groups Apply same preservation treatment, at different times, on same pavement structure LTPP focus is on timing/distress propagation rates, while NCAT/MnROAD studies and others focus on treatment comparisons… LTPP and NCAT/MnROAD studies complement / supplement each other 10
Trea t
cti on
men t Te st (6 ye Section a rs) 4
men t Te st (2 ye Section a rs) 2
es t S e
men t Te st (0 ye Section a rs) 1
men t Te st (4 ye Section a rs) 3
men t Te st (8 ye Section a rs) 5
trol T
Trea t
Con
Trea t
Trea t
Trea t
Example SPS-11 Project
6 test sections – 1 control (no overlay) and 5 treatment sections:
Traffic
11
Preservation Treatments AC Pavements (SPS-11) • Thin HMA overlays (< 1”) • Chip seals • Micro Surfacing PCC Pavements (SPS-12) • • •
Diamond grinding & DBR Joint sealants Joint penetrating sealers
Pavement Types SPS-11: • AC overlay of existing AC pavement (AC/AC)
SPS-12 : • Original jointed plain concrete pavement (JPCP)
13
Climate Thresholds: Precipitation of 20 inches/year Freezing Index of 150°F-days/year MERRA data
14
Traffic SPS-11 experiment considers both volumes and ESALs, while SPS-12 only considers ESALs
Vehicles per Day
Annual ESALs 100,000 200,000 300,000 400,000 500,000 600,000 700,000 800,000 > 900,000 1,000 2,000 3,000 4,000 5,000 6,000 7,000 8,000 > 9,000
LOW HIGH
15
Replicates, Repeats & Supplemental Replicates: Two per experimental cell; will depend on funding Repeat: Control test section plus test sections that have not received treatment Supplemental: Highly encouraged; will be supported and monitored by LTPP 16
3. Experimental Designs & Project Layouts
17
Dry
No Freeze
Freeze
No Freeze
Sub-Experiment / High Treatment
Low
High
Low
High
Low
High
Low
Tr af fic
Te m
Freeze
pe ra tu re
M
Wet
ois tu re
SPS-11 Matrix
Thin AC Overlay Chip Seal Micro-Surfacing
18
Trea t
cti on
men t Te st (6 ye Section a rs) 4
men t Te st (2 ye Section a rs) 2
es t S e
men t Te st (0 ye Section a rs) 1
men t Te st (4 ye Section a rs) 3
men t Te st (8 ye Section a rs) 5
trol T
Trea t
Con
Trea t
Trea t
Trea t
Typical SPS-11 Layout
Traffic
19
Dry
No Freeze
Freeze
No Freeze
Treatment
High
Low
High
Low
High
Low
High
Low
Tr af fic
Te m
Freeze
pe ra tu re
M
Wet
oi stu re
SPS-12 Matrix
Diamond Grinding & Dowel Bar Retrofit Joint Sealant Joint Penetrating Sealers
20
ond Gr BR ( inding 5 ye ars)
ond Gr BR ( inding 0 ye ars)
&D
ond G BR ( rinding 10 y ea rs )
Diam
ond G rin d (1 0 year ing s)
Diam
&D
Diam
ond Gr (0 y inding ea rs )
Diam
trol T Sect es t ion
Con
&D
Diam
ond Gr (5 y inding ea rs )
Diam
Diamond Grinding & DBR
Traffic
21
Se a lan @ 5 t Rep la c Ye a r Int ed erva ls
Se a lant 5 Ye Ca pped a r In @ terv als
Con trol :S kep ealant t As -Is
Con trol :S Mai ealant nta i ned
trol : Sea No lant
Con
Se a lant R @1 0 Ye ep la ced a r In terv als
Se a lant 10 Y Ca pped ear I nte @ rval s
Joint Sealant
(Cap/Replace Sealant)
Traffic
22
t Ye ar Re-A 0; Do N ot pply
Se a ler a
Se a le App r a t Ye ar ly @ 2 ye 0; Rear In terv a ls
: J oi Yea n t Seal Mai r 0, bu an t @ t nta i ned No t ; No sea l er
Con trol
Con t ro Mai l: J oin t nta i Se a l ned ; No an t sea l er
Con trol :N Sea lant o Joi n t (rem pres o ent) ; No ve if Sea ler
t Ye ar Re-A 5; Do N ot pply
Se a ler a
Se a le App r a t Ye ar ly @ 5 ye 5; Rear In terv a ls
Penetrating Sealer (Silanes or Siloxanes)
Traffic
23
50 ft 500 ft
Buffer Area
Test Section
Sampling Area
Buffer Area
100 ft
Sampling Area
Typical Test Section 50 ft 100 ft
24
Summary Phase I: Experiment Designs and MS&T Plans will be completed shortly Phase II: has been approved and work will commence shortly Project Schedule: construction and data collection guidelines will be completed by next fall and, once done, will start to recruit projects 25
26
