Concrete Pavement s e Ultra Thin Overlay Larry Scofield, P.E. IGGA 1
Big Preservation Funding, Funding, Funding 1. Decline in Buying Power 2. Increase in Consumption (wear) 3. Decline in Revenue Generation
Road Building/Preservation 1993 to 2014 $34,595 $56,445 63%
Decrease in Buying Power 1993 to 2014 1993 Lets Build 100 Miles of Road 2014 Lets Build 67 Miles of Road
Change in Consumption (Wear Out) 1993 to 2014 Minnesota s Consumption Increase 1993 Lets Drive 2014 Lets Drive 57 43 Billion VMT Billion VMT (33%)
Increase in US Vehicle Miles Traveled and Miles of Roadway (1990-2012)
Standards in Vehicle Fuel Efficiency Gas Tax
FHWA Performance Measures Measure Surface Assessment IRI (in/mi) Cracking Percent All Pavement s Population Consideration Population < 1 Million Population > 1 Million Good Fair Poor Good Fair Poor <95 95-170 >170 <95 95-220 >220 No Population Considerations Good Fair Poor Asphalt Good Fair Poor Jointed PCCP <5 5-10 > 10 Rutting (in) Faulting (in) Cracking Percent Asphalt Jointed PCCP CRCP No Population Considerations Good Fair Poor < 0.2 0.2-0.4 > 0.4 No Population Considerations Good Fair Poor < 0.05 0.05-0.15 > 0.15 No Population Considerations Good Fair Poor < 5 5-10 > 10
Why Concrete Pavement Preservation Bellefontaine, Ohio 1925 2016= 125 th Anniversary
2016 = 123 rd Anniversary
Message Slide Funding and the Transportation System are Critical Components of the National Economy Preservation is Not Only Important it is Absolutely Necessary Times Have Changed
Grinding Concrete
Commodity Price Increases 2000 1800 1600 Last Time Trust Fund Increased = 100) Index Va alue (1958 1400 1200 1000 800 600 400 Diamond Grinding First National CPR Conference DBR Asphalt PPI Consumer CPI NGCS 200 Concrete PPI 0
Its Cost Effective and Predictable $6.00 $5.00 National CDG Cost for Projects > Than 7,000 SY CDG Costs s (sq/yd) $4.00 $3.00 $2.00 $1.00 $0.00 1998 2000 2002 2004 2006 2008 2010 2012 Year
So Why Use Concrete Pavement s Ultra Thin Overlay Existing Concrete Pavements: Little Consumption of Non Renewal Resources for Preservation Previously Overlaid Concrete Pavements: Ability to Replace Existing Thin HMAC Overlays (Buried Treasure)
Why Concrete s Ultra Thin Overlay 3 Million Tons of Aggregate to Use 2 in Overlay
Exposed Concrete Surfaces Impact of Blade Spacers What Texture Should Look Like
What is Diamond Grinding? Removal lof fthin surface layer of fhardened d PCC using closely spaced diamond saw 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 Process
Finished Surface
Why Ultra Thin Overlay for Pre- Overlaid Concrete Pavements Buried Treasure
Urban Heat Island
So Why Consider this Now?
How Do You Find Buried Treasure?
National Treasure ROADWAY
Finding Buried Treasures Identify Projects Nearing Rehab Based on Distress Conditions that were Concrete Overlaid w/ac Identify Projects that were Overlaid for Functional Requirements (noise, ride, friction) or Repairable Bid Documents PMS Maintenance/Construction Personnel Conduct Engineering g Analysis Review Historical Records Deflection Testing Ground Penetrating Radar
Steps to Recovering Buried Treasures Investigate the Project Milling Off the Overlay Repairing the Concrete Diamond Grinding the Final Surface
Digging it UP! Milling Overlay off Things to Note Prevent Milling into the Concrete Often times variable depth of Overlay Carbide Tips can Damage Transverse Joints
Protect the Joints During Milling
Repairing the Treasure! Slab Replacement Slab Jacking Dowel Bar Retrofit Patchingt Sealing Conventional Diamond Grinding
Newark N.J. Case Example Concrete (23-60 yrs) 1931 1.4 Mile (Asbuilt) 1958 3.5 Mile (Asbuilt) 1970 1 Mile (Asbuilt) 9 Inches Thick 70,000 ADT Dowels Paper: Dan Frentress--National Conference on Preservation, Repair, and Rehabilitation of Concrete Pavements Asphalt Overlay (7-8 yrs) 1993 Micro Surfacing for Skid Improvement 2001 Micro Surfacing to Repair Previous Micro Surfacing Deterioration ti 2008 Buried Treasure (38 77 yrs old) Route 21
Slab Jacking (N.J.)
Slab Replacement
Pre-cast Panel Installed Ready for Diamond Grinding
Partial Depth Patches
Conventional Diamond Grinding through AC and PCCP
Conventional Diamond Grinding 30 % Ride Improvement
Conventional Diamond Grinding --Low Spots In AC--
Joint Resealing
Minnesota I-394 Buried Treasure Example Courtesy Bernard Izevbekai-- MnDOT
I-394 History 1987: PCCP Constructed in with Transverse Tining 1996: 2 AC Overlay for Noise 2004: 1 ¾ Mill & Fill + 5/8 UTBWC 2015 Buried Treasure (30 yr old) Courtesy Bernard Izevbekai-- MnDOT
REPAIRS ON I-394 Anticipated 80% Full Depth Repairs 20% Partial Depth Repairs True Condition of Underlying Concrete After Removal of UTBWC Necessitated Courtesy Bernard Izevbekai-- MnDOT 80% Partial Depth Repairs 20% Full Depth Repairs Called Buried Treasure AVINGS
I-394 REMOVAL OF UTBWC Courtesy Bernard Izevbekai-- MnDOT
Courtesy Bernard Izevbekai-- MnDOT Removal of UTBWC
FULL DEPTH REPAIRS ON I-394 Courtesy Bernard Izevbekai-- MnDOT
I-394 Project View Note Transition Point Transverse Tined UTBWC Courtesy Bernard Izevbekai-- MnDOT
I- 394 PAVEMENT SURFACES Milled Surface Conventional Diamond Grind
Washington SR522 Concrete Construction 8 Plain Reinforced Concrete Pavement Previous Asphalt widened lanes removed and replaced with concrete then entire project diamond ground Asphalt Numerous Overlays Lane Widening with Full Depth Asphalt Ride quality and appearance suffered due to multiple patches, overlays and aging asphalt lane additions so Buried Treasure Approach Used in 2002
Washington SR 522
WA SR522 More Traditional a Functional Distress Removal Faultin g
4/4/2017 International Grooving & Grinding Association 53
Questions