Selection and Use of Thin Surface Treatments

Transcription

1 Selection and Use of Thin Surface Treatments Stephen R. Mueller, P.E. Pavement and Materials Engineer FHWA Resource Center (Lakewood, Colorado) Federal Highway Administration

2 Navigating the Waves of Change Asset Management Philosophy Network-wide Use Economic Principles Preservation First Integrate Programs Concentrate on Corridors Define Design Life in terms of Traffic

3 Division Offices FHWA Organization FHWA Headquarters Resource Center Alabama Alaska Florida Georgia Louisiana Maine Nebraska Nevada Oklahoma Oregon Vermont Virginia Arizona Arkansas California Colorado Hawaii Idaho Illinois Indiana Maryland Massachusetts Michigan Minnesota New Hampshire New Jersey New Mexico New York Pennsylvania Rhode Island South Carolina South Dakota Washington West Virginia Wisconsin Wyoming Connecticut Delaware D.C. Iowa Kansas Kentucky Mississippi Missouri Montana North Carolina North Dakota Ohio Tennessee Texas Utah Puerto Rico

4 The RC is Serving customers nationwide San Francisco, CA Lakewood, CO Olympia Fields, IL Baltimore, MD Atlanta, GA

5 The Federal Role: 1.Promote uniformity, quality, and safety aspects of highway construction and maintenance. 2. Develop, promote, and provide new technologies and training. 3. Stewardship of the Federal-aid program and its investments.

6 Highway Agency Relationships FHWA AASHTO State DOTs Local Governments Private Sector

7 OUR SOCIETY DEPENDS ON OUR INFRASTRUCTURE FOR THE MOVEMENT OF BOTH PEOPLE AND GOODS! SOCIAL INTERACTIONS ECONOMIC TRANSACTIONS INFRASTRUCTURE Roads, Bridges, Airports, Water Systems, Wastewater Systems, Gas, Electric, Telephones, Waterways, Coastal Facilities, Parks, Etc.

8 Goals and Objectives of this Presentation: Present information on the various surface treatments available for preventive maintenance focusing on project selection.

9 Presentation Outline 1. Introduction and Federal Interest 2. Pavement Preservation Concepts and how they relate to Project Selection 3. Common Thin Surface Treatments 4. Methodologies for Selection 5. Concluding Remarks

10 Pavement Condition Performance Curves / Costs of Repairs 40% Drop in Quality $1.00 to Preserve / Maintain Here 75% of Life 40% Drop in Quality 12% $4-$5? $11-$14? $32-$58? Here! Terminal Serviceability T 0 T 1 Initial Design Pavement Life

11 The Pavement Preservation Concept Original Pavement Very Good Good Fair Poor Rehabilitation Trigger Very Poor Time (Years)

12 A QUICK CHECK OF THE HEALTH OF YOUR HIGHWAY NETWORK

13 Pavement Preservation Guidelines Type of Activity Increase Capacity Increase Strength Reduce Aging Restore Serviceability New Construction Reconstruction Major (Heavy) Rehabilitation X X X X X X X X X X X Structural Overlay X X X Pavement Preservation Minor (Light) Rehabilitation X X Preventive Maintenance X X Routine Maintenance Corrective (Reactive) Maintenance Catastrophic Maintenance X X X

14 Preservation Activities - Examples Asphalt: Chip Seals Fog Seals Slurry Seals Surface Seals Micro-Surfacing Thin Overlays Profile Milling Crack Sealing PCC: Joint Resealing Crack Sealing Spall Repair Dowel Bar Retrofit Full and Partial Depth Repair Diamond Grinding

15 Surface Treatments Purpose Typically used to: Seal cracks Waterproof surface Improve friction Improve rideability Rejuvenate surface

16 Surface Treatments Types Fog seal Slurry seal Chip seal Microsurfacing CIR/HIR Mill and Thin HMA Overlay Others?

17 Key Factors to Consider 1. Sealing Needed? 2. Cracking Types / Extent? 3. Rutting? 4. Friction/Texture Issues? 5. Other Surface Defects? Treatment Life? Life Extension of Underlying Pavement? Cost Effectiveness?

18 Sand Patch (or Sand Circle ) Test A procedure for determining pavement surface macrotexture through the spreading of a predetermined volume of sand or glass bead material on the pavement surface of a given area. (ASTM E965)

19 Fog Seal Description Light application of diluted, slow-setting asphalt emulsion without aggregate cover Purpose Seal pavement Inhibit raveling Enrich hardened/oxidized asphalt Provide delineation with shoulder

20 Slurry Seal Description Mixture of well-graded aggregate and an asphalt emulsion Purpose Seal surface cracks Correct raveling/oxidation Fill minor surface irregularities and restore friction

21 Chip Seal Description Application of asphalt and aggregate chips rolled onto the pavement Purpose Seal pavement Enrich hardened/oxidized asphalt Retard reflection cracking on HMA overlays Improve surface friction

22 Microsurfacing Description Mixture of high-quality aggregates and polymer-modified emulsion binder Purpose Seal pavement surface Fill ruts/minor surface irregularities Inhibit raveling and surface oxidation Improve surface friction

23 Recycling Treatments Purpose Typically used to Rework HMA to a depth of 1 to 4 inches. Correct surface distresses Improve profile, crown, and slope

24 Recycling Treatments Types (for Preservation) Cold In-Place Recycling Hot In-Place Recycling

25 Cold In-Place Recycling Description Milling, rejuvenating, and replacement of the top portion of the HMA surface (performed without heat) Purpose Rework HMA to depth of 2 4 inches. Correct surface distresses. Improve profile, crown, and cross-slope.

26 Hot In-Place Recycling Description Milling, rejuvenating, and replacement of the top portion of the HMA surface (performed with heat) Purpose Rework HMA to depth of 1 to 2 inches. Correct surface distresses. Improve profile, crown, and cross-slope.

27 Milling with Thin HMA Overlay Description Application of a new HMA wearing course after milling of the top portion of the HMA surface Purpose Improve rideability and surface friction. Improve profile, crown, and cross-slope. OGFC reduce hydroplaning and tire splash.

28 What is Best? Right pavement, Right treatment, Right time. Where are these determined?

29 Right Pavement (Project Selection) Current condition Age Expected life Construction quality Traffic Environment Others

30 Right Treatment (Treatment Selection) Decision tools Trees Matrices Other factors Materials Contractors Delay Costs Benefits Experience

31 Right Time (Optimization) Time-based schedules Decision tools (condition-based) Recommended Reading: Optimal Timing of Pavement Preventive Maintenance Treatment Applications NCHRP Report 523 (February 2005)

32 Pavement Condition Preventive vs. Reactive Maintenance Preventive Maintenance Reactive Maintenance Time

33 Time-Based Schedule Example New York State-Initial Guidelines Treatment Type Appl. Cycle, yrs HMA pavement crack sealing Thin HMA overlays (38 mm [1.5 in]) Surface treatments of HMA pavements Surface treatments of shoulders Clean drainage

34 HMA Decision Tree Example Raveling and Weathering Structural Condition Adequate Not Adequate ADT < to 5000 >5000 Fog Seal or Chip Seal Fog Seal or Chip Seal or Microsurfacing Fog Seal or Microsurfacing Not Appropriate for Preventive Maintenance

35 Training 4 NHI Classes on Pavement Preservation The Preventive Maintenance (PM) Concept NHI Course # Selecting Pavements for Preventive Maintenance NHI Course # Design and Construction of Quality PM Treatments NHI Course # Integrating PM into Pavement Management Systems NHI Course #

36 FHWA WEBSITE

37 Pavement Preservation Mantra: Apply the right treatment... to the right road at the right time. Think Engineering and Economics!

38 Preservation and Asset Management won t bring short-term glory, but they will bring long-term satisfaction!

39 Questions?

40 THANK YOU For more information contact: Steve Mueller FHWA Resource Center Telephone: (720)