MnDOT Update on Full Depth Repairs MnDOT Update on Full Depth Repairs Research Maria Masten, P.E and Gordy Bruhn MnDOT Concrete Engineering Unit CPAM Concrete Paving Workshop March 9, 2017
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MnDOT Update on Full Depth RepairsMnDOT Update on Full Depth Repairs Research
Maria Masten, P.E and Gordy BruhnMnDOT Concrete Engineering UnitCPAM Concrete Paving Workshop
March 9, 2017
• What did we try?E di d ti k• Epoxy dip and stick
• Epoxy double dip • Epoxy – fill and twist p y• Grout box method • Grout dip and stick
h ld• 1 hour old grout• Grout capsules • Polygrip epoxyPolygrip epoxy
• Also tried additional brushing and compressed air and grout rings to see if any made a significant impact on the performance of the repair
• Had problems with epoxy due to cold temperatures
2013 Construction Season
• MnDOT randomly cored CPR j t i 2013every CPR project in 2013
• One Contractor took initiative to core and check their own workmanship
• Most effective cause for Contractor to change was when MnDOT cored each project – even when C t t kiContractors were working on multiple projects
MnROAD FDR Field Installation – Phase 2 –8/15-16/2013
• 1” and 1.25” diameter dowel bars
/ /
1 and 1.25 diameter dowel bars• All lanes diamond ground
N t difi d t b t l• No grout, modified grout bag, grout capsule, epoxy (2 types)C ll d l i• Controlled location
• FWD testing seasonally• Coring• Monitoring over timeMonitoring over time
Old I-94 By-Pass Lane Test SectionMnROAD Mainline - Old Westbound Interstate I-94 (By-Pass)13 cells 9” JRCP / 6” Class-6 Base / Clay (1973)each cell has 3 joints = 81 feet long = both lanes Estimated 140,000 Rigid ESAL/Year
28 500 ADT 13% T k28,500 ADT - 13% TrucksStarts MP-199 1East
joint# 1 2 3 1 2 3 1 2 3 1 2 3 1 2 3 1feet 13.5 27 27 13.5 13.5 27 27 13.5 13.5 27 27 13.5 13.5 27 27 13.5 13.5 27 27 13.5
Cell 973 Cell 974
Diamond Grinding Diamond Grinding Diamond Grinding Diamond Grinding Diamond Grinding
Cell 970 Cell 971 Cell 972
1 2
1.25" Dowels 1" Dowels 1.25" Dowels 1" Dowels
Cell 975 Cell 976 Cell 977 Cell 978 Cell 979
1" Dowels
Full Depth Joint Repair Full Depth Joint RepairNo Grout No Grout Grout - Bag Injected Grout - Bag Injected Grout - Dip Method
Full Depth Joint Repair Full Depth Joint Repair Full Depth Joint RepairDiamond Grinding Diamond Grinding Diamond Grinding Diamond Grinding Diamond Grinding
joint# 1 2 3 1 2 3 1 2 3 1 2 3 1 2 3 2feet 13.5 27 27 13.5 13.5 27 27 13.5 13.5 27 27 13.5 13.5 27 27 13.5 13.5 27 27 13.5
Epoxy - Powers Epoxy - Powers1 25" Dowels 1" Dowels 1 25" Dowels 1" Dowels 1 25" Dowels
Grout - Dip Method Grout - Capsule Method Grout - Capsule Method
Diamond Grinding Diamond Grinding Diamond Grinding Diamond Grinding Diamond GrindingFull Depth Joint Repair Full Depth Joint Repair Full Depth Joint Repair Full Depth Joint Repair Full Depth Joint Repair
2West Note: Updated - July 24, 2013
Need to discuss the -joint# 1 2 3 1 2 3 1 2 3 Monitoring (FWD Joints, Distress, LISA Ride)
feet 13.5 27 27 13.5 13.5 27 27 13.5 13.5 27 27 13.5 Analysis - Need to discuss
Cell 980 Cell 981 Cell 982
1.25 Dowels 1 Dowels 1.25 Dowels 1 Dowels 1.25 Dowels
FWD Point pre-full depth repair26 points (2 per cell)marked on roadway
Diamond Grinding Diamond Grinding Diamond Grinding
1" Dowels 1.25" Dowels
Full Depth Joint Repair Full Depth Joint Repair No RepairEpoxy - Rezi Weld Epoxy - Rezi Weld "control"
MnROAD Traffic (I-94 Bypass)
• 9” JRCP/6” Class-6 Base / Clay (1973)i d 1 0 000 i id S /• Estimated 140,000 Rigid ESAL/Year
• 28,500 AADT – 13% Trucks
• Since Test Section Installations (8/16/13-12/31/16)Days on Rigid AADT %WB %Trucks in By-pass CESALS Traffic DL
9/1/2013 29 164,133 6576 23.8 81.72014 66 348 656 4871 18 1 79 22014 66 348,656 4871 18.1 79.22015 58 316,824 4585 15.9 78.92016 166 869 463 12574 45 4 81 92016 166 869,463 12574 45.4 81.9Totals 319 1,699,076
FWD Testing Locations Cells 970 - 981 (w/patches)
East Patch "X" West
Cell 982 (control w/o patch)
East Joint "X" West
Passing Passing
Driving
Driving
X, approach, patch
X, leave, pavement
X, approach, pavement
X, leave, patch X, leave, pavement
X, approach, pavement
Measuring Dowel Bar Effectiveness with FWD TestingFWD Testing
• Larson and Smith (2005) suggest that “doweled joints with• Larson and Smith (2005) suggest that doweled joints with LTE of 85 percent or less and/or a differential deflection greater than 5 mils in five years or less are unlikely to provide satisfactory long-term performance.”
• Values reflect new construction – I believe adaptive to pperformance of full depth repairs
Source: Guide to Dowel Load Transfer Systems for Jointed Concrete Roadway Pavements (Sept 2011)Pavements (Sept 2011)
Measuring Dowel Bar Effectiveness with FWD TestingFWD Testing
T i l “A ti ” th h ld f 50 t 70• Typical “Action” thresholds range from 50 to 70 percent Load Transfer Efficiency (LTE) considering LTE onlyonly
• Larson and Smith (2005) suggest that “The maximum diff ti l d fl ti it i f 5 il h ldifferential deflection criteria of 5 mils may help evaluate dowel looseness or the possibility of delaminations in the concrete at the dowel bar level ”delaminations in the concrete at the dowel bar level.
Source: Guide to Dowel Load Transfer Systems for Jointed Concrete Roadway Pavements (Sept 2011)Pavements (Sept 2011)
D1D10 D3 direction of traffic and testing
approach, pavement
NG1 NG1.25 GB1 GB1.25 GD1 GD1.25 GC1 GC1.25 EP1 EP1.25 ER1 ER1.25 C
Cells 970D1D10 D3direction of traffic and testing
leave, patch
NG1 NG1.25 GB1 GB1.25 GD1 GD1.25 GC1 GC1.25 EP1 EP1.25 ER1 ER1.25
D1D10 D3direction of traffic and testing
approach, patch
NG1 NG1.25 GB1 GB1.25 GD1 GD1.25 GC1 GC1.25 EP1 EP1.25 ER1 ER1.25
w/patches) D1D10 D3direction of traffic and testingdirection of traffic and testing
leave, pavement
NG1 NG1.25 GB1 GB1.25 GD1 GD1.25 GC1 GC1.25 EP1 EP1.25 ER1 ER1.25 C
D1D10 D3 direction of traffic and testingDowel bar looseness
approach, pavement
NG1 NG1.25 GB1 GB1.25 GD1 GD1.25 GC1 GC1.25 EP1 EP1.25 ER1 ER1.25 C
direction of traffic and testing
Cells 970D1D10 D3
leave patchleave, patch
Dowel bar looseness
NG1 NG1.25 GB1 GB1.25 GD1 GD1.25 GC1 GC1.25 EP1 EP1.25 ER1 ER1.25
D1D10 D3direction of traffic and testing
approach, patch
Dowel bar looseness
NG1 NG1.25 GB1 GB1.25 GD1 GD1.25 GC1 GC1.25 EP1 EP1.25 ER1 ER1.25
w/patches) D1D10 D3direction of traffic and testing
leave, pavement
Dowel bar looseness
NG1 NG1.25 GB1 GB1.25 GD1 GD1.25 GC1 GC1.25 EP1 EP1.25 ER1 ER1.25 C
NG1 NG1.25 GB1 GB1.25 GD1 GD1.25 GC1 GC1.25 EP1 EP1.25 ER1 ER1.25 C
NG1 NG1.25 GB1 GB1.25 GD1 GD1.25 GC1 GC1.25 EP1 EP1.25 ER1 ER1.25 C
Preliminary Conclusions
• No Grout and Dip and Stick Grout repairs are f i hperforming the worst
• In some cases the data shows that the No Grout and Dip and Stick were worse than doing nothing (control)
• The 1” diameter dowel bars are showing increased differential deflection vs. the 1.25” diameter dowelsdowels
• Final Report on Research will be completed by Fall• Final Report on Research will be completed by Fall 2017
Summer of 2017
• Concrete Rehab Projectsj• Verification of Increased Drill Bit Diameter
• MnROAD constructionN ti l R d R h Alli (NRRA)• National Road Research Alliance (NRRA) pooled fund
• Concrete Rehab and Diamond Grinding
Utilize Drill Bit Diameter ≥1/8th-inch larger then Specified Dowel Bar Diam. p
1.25’’ Dowel requires a drill bit1.25 Dowel requires a drill bit diameter of 1.375’’ (1 3/8’’ min.)
Full Depth Repair Type CD-HVFull Depth Repair Type CD HV
Increased Drill and Grout Dowel Full Depth Repair Increased Drill and Grout Dowel
Bar Size, From 1-inch to 1.25-inch Dowel Bar Diam.
12’ wide (typical)
Low Volume Full Depth Repair will Remain 1’’ Diameter Dowel Bars
Summer of 2017 – MnROADConstructionConstruction
• MnROAD has roughly 1800 ftMnROAD has roughly 1800 ft
• 27 foot panels ~ 60+ panels
• 1973 PCC Doweled Concrete (9" thick)
• Looking for 15 material TypesLooking for 15 material Types• 3U18 – Modified, 3U18 – Accelerator, HMA
• 2 - 3" depth patches
GOAL: 5 year maintenance type fixesGOAL: 5 year – maintenance type fixes
Proposed Repair Layout
3 foot HMA Inside Shoulder
Transition Slabno repairs Panel 1 Panel 2
Panel 3
Transition Slabno repairs
12'PassingLane
Transition Slabno repairs
Transition Slabno repairs
12'DrivingLane
27' 27' 27' 27' 27'
10 foot HMA Outside Shoulder
// / / /MnDOT Specifications - http://www.dot.state.mn.us/materials/concretedocs/MemoandCPR_Details_04-22-2016.pdf
Centerline Patch (10" x 60" - 5" on each side of C/L) Corner Patch (10"x10")1 pass 6 feet 2 pass 4 feet
Midlane Patch (10"x36" - 5" on each side of C/L)) C/L Joint Patch (10"x24" -- 5" in into each panel)2 pass 6 feet 2 pass 4 feet
Full length patch (10" x 144" - 5" on each side of C/L) Wheel Path Patch (10"x92" -- 5" in into each panel - ends in WP)1 pass 24 feet 1 pass 8 feet
Midlane Patch (10"x10")2 pass 2 feet
Summer of 2017 – MnROADConstructionConstruction
• Diamond Grind Low Volume Road LoopsDiamond Grind Low Volume Road Loops• See if diamond grinding accelerates materials
related distress (MRD)related distress (MRD)
• One lane environmental – one lane traffic
• Both will have deicing activities similar to the highway
• Apply sealer on some sections to see if mitigate MRD
GOAL: Controlled sections to monitor
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