-Buried Treasure- Finding Innovative Solutions by Looking Beneath the Surface

Transcription

1 -Buried Treasure- Finding Innovative Solutions by Looking Beneath the Surface

2 WHAT IS A TREASURE?

3 --TREASURE-- A Quantity of Precious Metals, Gems, or other Valuable Objects

4 NATIONAL TREASURE ROADWAY

5 --WHAT IS BURIED TREASURE-- A Pavement Preservation Technique that Uncovers and Renews Aged PCCP that has Been Overlaid with Asphalt due to Functional Requirements and Not Structural Issues Functional Issues Consist of Noise, Friction, and Smoothness A Planned Preservation Strategy that can Maximize the Original Life of a Our National Treasure which is a Multi- Trillion Dollar Investment

6 HOW IS IT ACCOMPLISHED Removing the Existing AC Overlay by Milling Off and Recovering RAP to Offset Costs Repair the Existing Concrete Pavement as Needed Diamond Grind the Surface to Restore the Roadway Template, Provide a Smooth and Quiet Ride

7 IS IT JUST ROADS?

8 SO WHY CONSIDER THIS NOW?

9 Index Value (1958 = 100) COMMODITY PRICE INCREASES Last Time Trust Fund Increased 1400 Asphalt PPI First National CPR Conference DBR Consumer CPI Diamond Grinding NGCS 200 Concrete PPI 0

10 CDG Costs (sq/yd) ITS COST EFFECTIVE AND PREDICTABLE $6.00 $5.00 National CDG Cost for Projects > Than 7,000 SY $4.00 $3.00 $2.00 $1.00 $ Year

11 ROAD BUILDING/PRESERVATION 1993 AND 2014 Funding (30% Decline in Buying Power) 1993 Lets Build 100 Miles of Road 2014 Lets Build 67 Miles of Road Iowa Consumption Rate (27% increase in Wear out Rate) 1993 Lets Drive 25.4 Billion VMT 2014 Lets Drive 32.3 Billion VMT

12 INCREASE IN VEHICLE MILES TRAVELED AND MILES OF ROADWAY ( )

13 STANDARDS IN VEHICLE FUEL EFFICIENCY Gas Tax

14 HOW DO YOU FIND BURIED TREASURE?

15 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 Analysis Review Historical Records Deflection Testing Ground Penetrating Radar

16 STEPS TO RECOVERING BURIED TREASURES Investigate the Project Milling Off the Overlay Repairing the Concrete Diamond Grinding the Final Surface

17 MILLING OVERLAY OFF THINGS TO NOTE Prevent Milling into the Concrete Often times variable depth of Overlay Carbide Tips can Damage Transverse Joints DIGGING IT UP!

18 PROTECT THE JOINTS DURING MILLING

19 REPAIRING THE TREASURE! Slab Replacement Slab Jacking Dowel Bar Retrofit Patching Sealing Conventional Diamond Grinding

20 NEWARK N.J. CASE EXAMPLE CONCRETE (23-60 YRS) Mile (Asbuilt) Mile (Asbuilt) Mile (Asbuilt) 9 Inches Thick 70,000 ADT Dowels ASPHALT OVERLAY (7-8 YRS) 1993 Micro Surfacing for Skid Improvement 2001 Micro Surfacing to Repair Previous Micro Surfacing Deterioration 2008 Buried Treasure (38 77 yrs old) Paper: Dan Frentress--National Conference on Preservation, Repair, and Rehabilitation of Concrete Pavements Route 21

21 SLAB JACKING (N.J.)

22 SLAB REPLACEMENT

23 PRE-CAST PANEL INSTALLED READY FOR DIAMOND GRINDING

24 PARTIAL DEPTH PATCHES

25 CONVENTIONAL DIAMOND GRINDING THROUGH AC AND PCCP

26 CONVENTIONAL DIAMOND GRINDING 30 % Ride Improvement

27 CONVENTIONAL DIAMOND GRINDING --LOW SPOTS IN AC--

28 JOINT RESEALING

29 MINNESOTA I-394 BURIED TREASURE EXAMPLE Courtesy Bernard Izevbekai-- MnDOT

30 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

31 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

32 I-394 REMOVAL OF UTBWC Courtesy Bernard Izevbekai-- MnDOT

33 Courtesy Bernard Izevbekai-- MnDOT Removal of UTBWC

34 FULL DEPTH REPAIRS ON I-394 Courtesy Bernard Izevbekai-- MnDOT

35 I-394 Project View Note Transition Point Transverse Tined UTBWC Courtesy Bernard Izevbekai-- MnDOT

36 I- 394 PAVEMENT SURFACES Milled Surface Conventional Diamond Grind

37 WASHINGTON SR522 Construction CONCRETE 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

38 WASHINGTON SR 522

39 WA SR522 MORE TRADITIONAL FUNCTIONAL DISTRESS REMOVAL Faulting

40 WHAT IS DIAMOND GRINDING? Removal of thin surface layer of hardened PCC using closely spaced diamond saw blades; Results in smooth, level pavement surface; Longitudinal texture with desirable friction and low noise characteristics;

41 DIAMOND GRINDING EQUIPMENT

42 DIAMOND GRINDING EQUIPMENT PROCESS

43 FINISHED SURFACE

44 PAVEMENT PROBLEMS ADDRESSED Faulting at joints and cracks Built-in or construction roughness Polished concrete surface Wheelpath rutting Unacceptable noise level Permanent upward slab warping Inadequate transverse slope

45 CDG Costs IN SUMMARY The economics have changed and will continue to favor AC removal and diamond grinding (Buried Treasure) Savings in Non-renewable Aggregate Sources Most Sustainable Milled AC Salvage Can Be A Revenue Source Maximizes Use of Concrete $6.00 Pavement Long Life $4.00 $2.00 $ Year

46 NATIONALTREASURE ROADWAY

47 THANK YOU AND VISIT US ON THE WEB