coco cete a e e tsutancrete pavement’s ultra thin overlay · 2020-05-21 · 2016 =...
TRANSCRIPT
Concrete Pavement’s Ultra Thin Co c ete a e e t s U t aOverlay
Larry Scofield P ELarry Scofield, P.E.
IGGA
1
“Big Preservation”g
Funding, Funding, Funding 1. Decline in Buying Power2. Increase in Consumption (wear)3. Decline in Revenue Generation
Road Building/PreservationRoad Building/Preservation1993 to 2014
$34 595 $56 445$34,595 $56,44563%
Decrease in Buying Power 1993 to 2014
1993 Lets Build 100 Miles of
2014 Lets Build 67 Miles of Road
Road
Change in Consumption (Wear Out)Change in Consumption (Wear Out)1993 to 2014
Minnesota’s Consumption Increase
1993 L t D i 2014 L t D i 57 1993 Lets Drive 43 Billion VMT
2014 Lets Drive 57 Billion VMT (33%)
Increase in US Vehicle Miles Traveled and Miles of RoadwayTraveled and Miles of Roadway (1990-2012)
Standards in Vehicle Fuel Efficiency
Gas Tax
FHWA Performance MeasuresMeasure Surface Assessment
Population < 1 Million Population > 1 MillionAll
PavementIRI (in/mi)
Population Consideration
Good Fair Poor Good Fair Poor<95 95 - 170 >170 <95 95 - 220 >220
No Population ConsiderationsGood Fair Poor
Pavements
IRI (in/mi)
A h l Good Fair PoorAsphalt Jointed
PCCPCracking Percent <5 5 - 10 > 10
No Population ConsiderationsGood Fair Poor< 0.2 0.2-0.4 > 0.4
AsphaltRutting (in)
No Population ConsiderationsGood Fair Poor< 0.05 0.05-0.15 > 0.15
Faulting (in)Jointed
PCCP
No Population ConsiderationsGood Fair Poor
< 5 5 - 10 > 10Cracking Percent CRCP
Why Concrete Pavement PreservationBellefontaine, Ohio 1925Bellefontaine, Ohio 1925
2016= 125th Anniversary
2016 = 123rd Anniversary
M SlidMessage Slide
• Funding and the Transportation S t C iti l C t f thSystem are Critical Components of the National Economy
• Preservation is Not Only Important it is Absolutely NecessaryAbsolutely Necessary
• Times Have Changed
Grinding ConcreteConcrete
Commodity Price Increases2000
1600
1800
2000
Last Time Trust Fund Increased
1200
1400
1600
= 10
0)
Asphalt PPI
1000
1200
alue
(195
8
First National CPR
Conference Consumer CPI
DBR
600
800
Inde
x Va
Diamond Grinding
Conference
NGCS
Consumer CPI
200
400Grinding NGCS
Concrete PPI
0
Its Cost Effective and PredictablePredictable
$6.00
$5.00National CDG Cost for Projects > Than 7,000 SY
$
$4.00
s (s
q/yd
)
$2.00
$3.00
CD
G C
osts
$1.00
$0.001998 2000 2002 2004 2006 2008 2010 2012
Year
So Why Use Concrete yPavement’s Ultra Thin Overlay
• Existing Concrete Pavements: Little C ti f N R l RConsumption of Non Renewal Resources for Preservation
• Previously Overlaid Concrete Pavements: Ability to Replace Existing Thin HMAC Overlays (Buried Treasure)
Why Concrete’s Ultra ThinWhy Concrete s Ultra Thin Overlay
3 Million Tons of Aggregate to Use 2 in Overlayto Use 2 in Overlay
Exposed Concrete SurfacesExposed Concrete Surfaces
Impact of Blade SpacersWhat Texture Should Look LikeImpact of Blade Spacers Like
What is Diamond Grinding?What is Diamond Grinding?
R l f thi f l f h d dRemoval of thin surface layer of hardened PCC using closely spaced diamond saw blades;blades;
Results in smooth, level pavement surface;
Longitudinal texture with desirable friction and low noise characteristics;
Pavement Problems Addressed Faulting at joints and cracks
Built-in or construction roughness
Polished concrete surface—Friction Improvement
Unacceptable noise level
Permanent upward slab warping
Diamond Grinding Equipment
Diamond Grinding Equipment ProcessProcess
Finished Surface
Why Ultra Thin Overlay for PreWhy Ultra Thin Overlay for Pre-Overlaid Concrete Pavements–B i d TBuried Treasure
Urban Heat Island
So Why Consider this Now?y
How Do You Find Buried Treasure?Treasure?
National Treasure
ROADWAYROADWAY
Finding Buried TreasuresFinding Buried Treasures Identify Projects Nearing Rehab Based
on Distress Conditions that were Concrete Overlaid w/ACConcrete Overlaid w/AC
Identify Projects that were Overlaid for Functional Requirements (noise, ride, friction) or Repairablefriction) or Repairable…
– Bid Documents– PMS– Maintenance/Construction Personnel
Conduct Engineering Analysisg g y Review Historical Records Deflection Testing Ground Penetrating Radar
Steps to Recovering BuriedSteps to Recovering Buried TreasuresInvestigate the Project
Milling Off the OverlayMilling Off the Overlay
Repairing the Concrete
Diamond Grinding the Final SurfaceSurface
Digging it UP!MilliMilling
Overlay off Things to Notey Things to Note• Prevent Milling into the
ConcreteConcrete
• Often times variable depth of Overlaydepth of Overlay
• Carbide Tips can Damage TransverseDamage Transverse Joints
Protect the Joints During Milling
Repairing the Treasure!Repairing the Treasure!
Slab ReplacementSlab Replacement
Slab Jacking
Dowel Bar Retrofit
P t hiPatching
SealingSealing
Conventional Diamond GrindingGrinding
Newark N.J. Case Example
Concrete (23-60 yrs) Asphalt Overlay (7-8 yrs)( y ) 1931 – 1.4 Mile (Asbuilt)
1958 – 3.5 Mile (Asbuilt)
p y ( y ) 1993 Micro Surfacing
for Skid Improvement 1958 3.5 Mile (Asbuilt)
1970 – 1 Mile (Asbuilt) 2001 Micro Surfacing to Repair Previous Micro S f i D t i ti 9 Inches Thick
70,000 ADT
Surfacing Deterioration
2008 Buried Treasure (38 77 ld)
Dowels(38 – 77 yrs old)
R tPaper: Dan Frentress--National Conference onPreservation, Repair, and Rehabilitation of ConcretePavements
Route 21
Slab Jacking (N.J.)
Slab Replacement
Pre-cast Panel Installed Ready for Di d G i diDiamond Grinding
Partial Depth Patchesp
Conventional Diamond Grinding through AC and PCCPthrough AC and PCCP
Conventional Diamond GrindingGrinding
30 % Ride Improvement
Conventional Diamond GrindingL S t I AC--Low Spots In AC--
Joint ResealingJoint Resealing
Minnesota I-394 Buried Treasure ExampleTreasure Example
Courtesy Bernard Izevbekai--MnDOT
I-394 History• 1987: PCCP Constructed in
with Transverse Tining
• 1996: 2” AC Overlay for Noise1996: 2 AC Overlay for Noise
2004 1 ¾” Mill & Fill 5/8”• 2004: 1 ¾” Mill & Fill + 5/8” UTBWC
• 2015 Buried Treasure (30 yr old)
Courtesy Bernard Izevbekai--MnDOT
REPAIRS ON I-394REPAIRS ON I 394Anticipatedp
• 80% Full Depth Repairs• 20% Partial Depth Repairsp p
True Condition of Underlying Concrete
• 80% Partial Depth Repairs
After Removal of UTBWC Necessitated
• 80% Partial Depth Repairs• 20% Full Depth Repairs
AVINGSCalled “Buried Treasure”
AVINGSCourtesy Bernard Izevbekai--MnDOT
I-394 REMOVAL OF UTBWC
Courtesy Bernard Izevbekai--MnDOT
Removal of UTBWC
Courtesy Bernard Izevbekai--MnDOT
FULL DEPTH REPAIRS ON I-394
Courtesy Bernard Izevbekai--MnDOT
I-394 Project View
Note Transition PointT Ti d UTBWC Transverse Tined
Courtesy Bernard Izevbekai--MnDOT
I- 394 PAVEMENT SURFACES
Milled Surface
Conventional Diamond GrindDiamond Grind
Washington— SR522g
Concrete AsphaltConcreteConstruction
8” Plain Reinforced
Asphalt Numerous Overlays
Lane Widening with Full 8 Plain Reinforced Concrete Pavement
Previous Asphalt
Lane Widening with Full Depth Asphalt
Ride quality and appearance suffered due Previous Asphalt
widened lanes removed and replaced with
t th ti
appearance suffered due to multiple patches, overlays and aging asphalt lane additions soconcrete then entire
project diamond groundasphalt lane additions so Buried Treasure Approach Used in 2002
Washington SR 522
WA SR522– More Traditional Functional ad t o a u ct o aDistress Removal
Faulting
4/4/2017 International Grooving & Grinding Association 53
Q tiQuestions