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Pavement Surface Characteristics

Pavement Surface Characteristics. 9 th Annual Concrete Conference The Crowne Plaza Timonium, Maryland March 24 th , 2009 Leif Wathne Larry Scofield. Learning Objectives. Concrete Surface T extures Sound and Noise? Texture and Friction What’s New? Summary and Conclusions .

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Pavement Surface Characteristics

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  1. Pavement Surface Characteristics 9th Annual Concrete Conference The Crowne Plaza Timonium, Maryland March 24th, 2009 Leif Wathne Larry Scofield

  2. Learning Objectives Concrete Surface Textures Sound and Noise? Texture and Friction What’s New? Summary and Conclusions

  3. SURFACE TEXTURES Pavement Surface Characteristics

  4. Why Transverse Tining? • Standard Practice Pre-1970’s? • Burlap Drag (46 states) • Brooming • CA Div. of Highways, 1971 • LA Freeway Studies • Grooving techniques • Capital Beltway in MD • Concrete Pavement… • What Happened?

  5. FHWA Technical Advisories… • FHWA T5140.10 September 1979 • Replaced Notice FHWA N5080.59 September 1976, "Texturing of Concrete Pavements and Bridge Decks.“ • “…transverse grooving is considered to be superior to longitudinal grooving for general use on new construction…”

  6. FHWA Technical Advisories… • FHWA T5040.36 “Surface Texture for Asphalt and Concrete Pavements” – Includes the following textures: • Transverse Tining Longitudinal Tining • Exposed Aggregate Diamond Grinding • Diamond Grooving Burlap Drag • Atrificial Turf Drag Transverse Broom • Good discussion of micro/macro texture, noise, etc.

  7. Typical Highway Concrete Texture Types 103-110dBA 100-104dBA Transverse Tine Conventional Diamond Grinding “Half” as Loud Next Generation Concrete Surface Longitudinal Tine 101-106 dBA 99-101dBA Traffic

  8. Texture Type By State Trans/LongGrooving RTT UTT AstroTurf Drag LT Asphalt Only Considering Changing to LT Alaska Diamond Grinding Hawaii Source: Larry Scofield

  9. SOUND and NOISE? Pavement Surface Characteristics

  10. The Sounds of Silence • Quality of Life • Investment Decisions • The Future is Different

  11. Two Types of Annoyance Volume (Too Loud) Frequency (Off Station) Tonal Spike 110 dBA 104 dBA 100 Frequency

  12. Noise Results

  13. Preliminary Catalog Results – Long. Tine Zone 3 Zone 2 Zone 1

  14. Preliminary Catalog Results – Trans. Tine Zone 3 Zone 2 Zone 1

  15. Growing Old Or “Acoustic Longevity” Asphalt Noise Level (dBA) Concrete Changing Performance Over Time Pavement Age (Yrs)

  16. Arizona ARFC Predicted Vs Actual Acoustic Durability 102.4dBA @ 10 Yrs Predicted Noise Level Change

  17. Acoustic Longevity of CDG in Kansas

  18. What Does it All Mean? Kansas Concrete Option 0 10 Time (yrs)

  19. TEXTURE, NOISE & FRICTION Pavement Surface Characteristics

  20. Texture Measurement

  21. US 30 Random Transverse Tined 110 dBA

  22. DFT / CTM vs. the Skid Trailer Friction (Microtexture) MPD (Macrotexture) Skid Number (SN40S)

  23. DFT / CTM vs. the Skid Trailer

  24. Trafficked Pavements Noise vs. Friction

  25. DFT/CTM Friction ASTM E 274 Skid Trailer Measured Friction 3/4” S + 1/8” D + Burlap (Short) 3/4” S + 1/8” D + No Pretexture Random S + 1/8” D + Burlap 3/4” S + 1/8” D + Burlap (Long) 3/4” S + 1/16” D + Burlap 1/2” S + 1/16” D + Burlap 1/2” S + 1/8” D + Burlap 3/4” S + 1/4” D + Burlap 1/2” S + 1/8” D + Burlap 3/4” S + 1/16” D + Turf 1” S + 1/8” D + Burlap 1” S + 1/8” D + Burlap 3/4” S + 1/8” D + Turf Diamond Grinding Standard Burlap Standard Turf Heavy Burlap Heavy Turf 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 Longitudinal Tining Transverse Tining Drag Diamond Grinding

  26. SOUND of SILENCE…What’s New? Pavement Surface Characteristics

  27. NGCS Compared to Pre-Traffic CDG CDG NGCS

  28. NGCS – How is it accomplished?

  29. NGCS Compared to Trafficked CDG CDG CDG NGCS

  30. NGCS Results Noise Results (Ampl)

  31. OBSI Frequency Spectrums (Freq)

  32. CONCLUSIONS Sustainability of Concrete Pavements Early Experiments in Transportation

  33. Summary/Conclusions • History – why transverse tining • 2005 FHWA TA  Move to long. textures • Quieter • Safe • More uniform • Acoustic durability! • Friction and Noise – Longitudinal textures • If noise is issue – NGCS is durable solution!

  34. Resources… • Engineering Bulletin Pavement Surf. Char.: Synthesis and Guide • Available on our website: www.acpa.org Topics for our 2009 program : • Concrete Mix Design Basics • Concrete Pavement Materials • Sustainability of PCCP • Curing • Hydration Processes • Introduction to the M-E PDG • Joint Layout and Design • Life Cycle Cost Basics • Materials Incompatibility • Maturity • Slipform Paving Operations • Soil Stabilization • Texturing Concrete Pavements • Thickness Design – Municipal • Troubleshooting Slabs on Grade PROFESSORS SEMINAR CONCRETE PAVEMENT 101/201

  35. Questions? lwathne@acpa.org

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