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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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slide1

Pavement Surface Characteristics

9th Annual Concrete Conference

The Crowne Plaza

Timonium, Maryland

March 24th, 2009

Leif Wathne

Larry Scofield

learning objectives
Learning Objectives

Concrete Surface Textures

Sound and Noise?

Texture and Friction

What’s New?

Summary and Conclusions

surface textures
SURFACE TEXTURES

Pavement Surface Characteristics

why transverse tining
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?
fhwa technical advisories
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…”
fhwa technical advisories1
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.
typical highway concrete texture types
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

texture type by state
Texture Type By State

Trans/LongGrooving

RTT

UTT

AstroTurf Drag

LT

Asphalt Only

Considering Changing to LT

Alaska

Diamond Grinding

Hawaii

Source: Larry Scofield

sound and noise
SOUND and NOISE?

Pavement Surface Characteristics

the sounds of silence
The Sounds of Silence
  • Quality of Life
  • Investment Decisions
  • The Future is Different
two types of annoyance
Two Types of Annoyance

Volume (Too Loud)

Frequency (Off Station)

Tonal Spike

110

dBA

104

dBA

100

Frequency

growing old or acoustic longevity
Growing Old Or “Acoustic Longevity”

Asphalt

Noise Level (dBA)

Concrete

Changing Performance Over Time

Pavement Age (Yrs)

arizona arfc predicted vs actual acoustic durability
Arizona ARFC Predicted Vs Actual Acoustic Durability

102.4dBA @ 10 Yrs

Predicted Noise Level Change

what does it all mean
What Does it All Mean?

Kansas Concrete Option

0

10

Time (yrs)

texture noise friction
TEXTURE, NOISE & FRICTION

Pavement Surface Characteristics

dft ctm vs the skid trailer
DFT / CTM vs. the Skid Trailer

Friction (Microtexture)

MPD (Macrotexture)

Skid Number (SN40S)

slide25

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

sound of silence what s new
SOUND of SILENCE…What’s New?

Pavement Surface Characteristics

conclusions
CONCLUSIONS

Sustainability of Concrete Pavements

Early Experiments

in Transportation

summary conclusions
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!
resources
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

questions
Questions?

lwathne@acpa.org