Improving Pavement Performance

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18 Νοε 2013 (πριν από 3 χρόνια και 6 μήνες)

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AAPA 2011 Study Tour


Improving Pavement Performance #1

Improving
Pavement
Performance

Part 1


V2

AAPA 2011 Study Tour


Surface Treatments #1


New Pavement design
Procedure


Asset management


Funding and pavement
maintenance


New technologies


www.aapa.asn.au

Introduction

AAPA 2011 Study Tour


Surface Treatments #1


Also know as…


www.aapa.asn.au

New SAPDM

AAPA 2011 Study Tour


Improving Pavement Performance #1

History


Damage models


Fatigue of asphalt wearing courses
(Freeme


1970s)


Fatigue of asphalt base layers including
temperature
(Published data


1970s to 1980s)


Permanent deformation for unbound material
(Maree


1970s to 1980s)


Effective fatigue and crushing failure for
cement stabilized layers
(de Beer


1980s)


Vertical strain criteria for subgrade
(Dorman and
Metcalf


1965)

AAPA 2011 Study Tour


Improving Pavement Performance #1

History of pavement performance in
South
-
Africa


Isolated from international community: late 1970

s
to mid 1990

s


Oil ??


Thick asphalt pavements


NO
-
NO


$$$ ??


Need to stretch every cent


Force innovation


AAPA 2011 Study Tour


Improving Pavement Performance #1

Problems with current method


Past implementation exposed all the weaknesses of
the method


Users became disillusioned with the method


Counter
-
intuitive and inadmissible results


Extreme sensitivity of the method to input


Inconsistent input


Resilient response (FWD, MDD, Laboratory)


Strength parameters


Outdated

models


Too many unexplained effects (chaos)

AAPA 2011 Study Tour


Improving Pavement Performance #1

R&D Dream #1: Close Gap Between Reality and Theory

Theory

Reality

Rut

Terminal rut

Roughness

Terminal IRI

Extent of fatigue

Time

Adjust the Theory to Predict Reality

AAPA 2011 Study Tour


Improving Pavement Performance #1

R&D Dream #2: Levelling the Playing Field

0
1
2
3
4
5
6
7
8
9
10
Area 1
Area 2
Area 3
Area 4
Area 5
Area 6
Area 7
Area 8
Area 9
Area 10
Level of Development
Overall system just as good as Weakest Link

AAPA 2011 Study Tour


Improving Pavement Performance #1

R&D Dream #3: Single “Tool”


Different User/Risk Levels

Young
professional

Seasoned
professional

Design

Specialist

Design scenario
:



Routine and preliminary design



Low risk



Low design experience



Known materials


default input



Conventional material classification

Design scenario
:



Important design



Medium risk



Seasoned professional designer



Project specific input

Design scenario
:



Very important design, high risk



Special investigations



Specialist designer



Unusual materials



Project specific input

User

Design application

AAPA 2011 Study Tour


Improving Pavement Performance #1

Process



May 2005: RPF initiate process


November 2005: P&R framework established


November 2006: Project briefs ready


February 2008


PPIS




revisit LTPP sections


Three horizons of deliverables:


Short:

12 to 18 months


Med: 5 to 8 years


Long: 8 to 12 years


AAPA 2011 Study Tour


Improving Pavement Performance #1

Concept

AAPA 2011 Study Tour


Improving Pavement Performance #1

AAPA 2011 Study Tour


Improving Pavement Performance #1

It will include:


Traffic loading predictions


Material resilient response


Pavement resilient response


Damage models


Probalistic and recursive schemes


Predict pavement response/performance, not E80

s

AAPA 2011 Study Tour


Surface Treatments #1

www.aapa.asn.au

Asset Management

AAPA 2011 Study Tour


Surface Treatments #1

0
20
40
60
80
100
2008
2013
2018
2023
2028
Year
Road Condition
Good

Fair

Poor

Very Poor

(Typically Designed for Traffic Expected over 20
-
30 Years)

Two Roads, same condition & traffic


but only budget for one ?

A

B

What is Asset Management ?

AAPA 2011 Study Tour


Surface Treatments #1

Asset management: Why is it important?

0%
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
National Road Network Length (Carriageway km)
Year
Pavement Age Trend
>25 yrs
21
-
25 yrs
16
-
20 yrs
11
-
15 yrs
6
-
10 yrs
0
-
5 yrs
75% of Network
Older than Original
20 Year Design Life

AAPA 2011 Study Tour


Improving Pavement Performance #1

0
20
40
60
80
100
2008
2013
2018
2023
2028
Year
Road Condition
What Is The Price We Pay (SANRAL)

Repair Cost =
X

/ km

Good

Fair

Poor

Very Poor

3
-
5 Years

Repair Cost =
6X

/ km

5
-
8 Years

Repair Cost =
18X

/ km

AAPA 2011 Study Tour


Improving Pavement Performance #1

Very Poor
Condition

Poor
Condition

Good Condition

Good

Poor

R 0
R 2
R 4
R 6
R 8
R 10
R 12
R 14
R 16
R 18
R 20
0
2
4
6
8
10
12
14
16
International Roughness Index (m/km)
Road User Cost (R/km)
Toll Class 1
Toll Class 2
Toll Class 3
Toll Class 4
Based on HDM
-
4 Modeling

What Is The Price We Pay


Road User

AAPA 2011 Study Tour


Improving Pavement Performance #1

Extending pavement life?

0
20
40
60
80
100
2008
2013
2018
2023
2028
Year
Road Condition
Good

Fair

Poor

Very Poor

Maintenance Actions

No Maintenance

Moisture Ingress

(Typically Designed for Traffic Expected over 20
-
30 Years)

Road Deterioration due to Traffic Loading &
Environment

AAPA 2011 Study Tour


Improving Pavement Performance #1

Asset management = planning

Degree of Planning
Routine Maintenance Costs Per Year (R/m
2
)
Preventative Maintenance
Reactive Maintenance
Total Maintenance
Optimal
Zone
At SANRAL = R 4.50 / m
2
per year
AAPA 2011 Study Tour


Improving Pavement Performance #1

Asset Management System

Building Blocks/Puzzle Pieces of AMS


Policy/Procedures



Principles/Rules to Guide Decisions and achieve rational
outcomes


what, where, when, how
.


Funding



Financial resources for operation and results implementation.


People

-

People make decisions, the rest are just to support the process
.


Hardware



Road Survey Equipment + IT Infrastructure.


Software



Computer based data Analysis and Storage Tools.


Data



Knowing what you have, its condition and performance Trend.

Hardware

Software

Data

People

Funding

Policy/

Procedures

AAPA 2011 Study Tour


Improving Pavement Performance #1


For asset management to be successful
all

the “pieces of the puzzle” need to be
in place in a
“balanced equilibrium”



It does not help you have the most advance survey vehicle but no means to
effectively store and
analyse the data, or


Have the most sophisticate software, but the quality of your data is suspect !


Without Funding and People


Nothing will happen !!!

Hardware

Software

Data

People

Funding

Policy/

Procedures

Asset Management System
-

Success

AAPA 2011 Study Tour


Improving Pavement Performance #1

Collect data


Road condition


Roughness, Rutting, micro & macro texture,
cracking, alignment, ROW video, deflections


Traffic


Counts, WIM,


Driver behaviour


Bridges


Etc…

AAPA 2011 Study Tour


Improving Pavement Performance #1


Economic Analysis

& Optimisation

Road Deterioration &

Maintenance Effects

Road User Effects

Centralised

Database

Dynamic
Segmentation

Uniform Sections

AMS Software
-

Life Cycle Modelling

Condition Surveys

AAPA 2011 Study Tour


Improving Pavement Performance #1

Performance prediction


Use commercially available

off the shelf


software


HDM4


PERS


dTIMS


Prediction models updated regularly


Calibrated against LTPP sections


AAPA 2011 Study Tour


Surface Treatments #1

Good

Fair

Poor

Very Poor

(Typically Designed for Traffic Expected over 20
-
30 Years)

Effect of intervention on pavement
performance

AAPA 2011 Study Tour


Improving Pavement Performance #1

SANRAL AMS Budgeting Procedure


Instrumental Data

CBA

Priority
List

PMS

RDME

RUE

Bridge Inspections

BMS

BDME

RUE

CBA

Priority
List

Traffic

Projected Total Volume (Sites)
No. America
Europe
Asia-Pacific
Government
Total
Sm. Systems
12,000
6,600
2,100
3,000
23,700
Med. Systems
6,200
3100
560
950
10,810
Lg. Systems
2,650
1850
180
400
5,080
Total
20,850
11,550
2,840
4,350
39,590
Projected Total Revenue (billions of $)
No. America
Europe
Asia-Pacific
Government
Total
Sm. Systems
$1.12
$0.62
$0.20
$0.28
$2.21
Med. Systems
$1.59
$0.80
$0.14
$0.24
$2.78
Lg. Systems
$1.80
$1.26
$0.12
$0.27
$3.46
Total
$4.52
$2.67
$0.46
$0.80
$8.45
Super Project List

Budget

Optimisation

Projected Total Volume (Sites)
No. America
Europe
Asia-Pacific
Government
Total
Sm. Systems
12,000
6,600
2,100
3,000
23,700
Med. Systems
6,200
3100
560
950
10,810
Lg. Systems
2,650
1850
180
400
5,080
Total
20,850
11,550
2,840
4,350
39,590
Projected Total Revenue (billions of $)
No. America
Europe
Asia-Pacific
Government
Total
Sm. Systems
$1.12
$0.62
$0.20
$0.28
$2.21
Med. Systems
$1.59
$0.80
$0.14
$0.24
$2.78
Lg. Systems
$1.80
$1.26
$0.12
$0.27
$3.46
Total
$4.52
$2.67
$0.46
$0.80
$8.45
Eastern

Projected Total Volume (Sites)
No. America
Europe
Asia-Pacific
Government
Total
Sm. Systems
12,000
6,600
2,100
3,000
23,700
Med. Systems
6,200
3100
560
950
10,810
Lg. Systems
2,650
1850
180
400
5,080
Total
20,850
11,550
2,840
4,350
39,590
Projected Total Revenue (billions of $)
No. America
Europe
Asia-Pacific
Government
Total
Sm. Systems
$1.12
$0.62
$0.20
$0.28
$2.21
Med. Systems
$1.59
$0.80
$0.14
$0.24
$2.78
Lg. Systems
$1.80
$1.26
$0.12
$0.27
$3.46
Total
$4.52
$2.67
$0.46
$0.80
$8.45
Southern

Projected Total Volume (Sites)
No. America
Europe
Asia-Pacific
Government
Total
Sm. Systems
12,000
6,600
2,100
3,000
23,700
Med. Systems
6,200
3100
560
950
10,810
Lg. Systems
2,650
1850
180
400
5,080
Total
20,850
11,550
2,840
4,350
39,590
Projected Total Revenue (billions of $)
No. America
Europe
Asia-Pacific
Government
Total
Sm. Systems
$1.12
$0.62
$0.20
$0.28
$2.21
Med. Systems
$1.59
$0.80
$0.14
$0.24
$2.78
Lg. Systems
$1.80
$1.26
$0.12
$0.27
$3.46
Total
$4.52
$2.67
$0.46
$0.80
$8.45
Northern

Projected Total Volume (Sites)
No. America
Europe
Asia-Pacific
Government
Total
Sm. Systems
12,000
6,600
2,100
3,000
23,700
Med. Systems
6,200
3100
560
950
10,810
Lg. Systems
2,650
1850
180
400
5,080
Total
20,850
11,550
2,840
4,350
39,590
Projected Total Revenue (billions of $)
No. America
Europe
Asia-Pacific
Government
Total
Sm. Systems
$1.12
$0.62
$0.20
$0.28
$2.21
Med. Systems
$1.59
$0.80
$0.14
$0.24
$2.78
Lg. Systems
$1.80
$1.26
$0.12
$0.27
$3.46
Total
$4.52
$2.67
$0.46
$0.80
$8.45
Western

Programming

Programming

Programming

Programming

Pavement Management System

Bridge Management System

AAPA 2011 Study Tour


Improving Pavement Performance #1

AAPA 2011 Study Tour


Surface Treatments #1


Before 1994

o
Provincial road maintenance
allocated nationally


1994 onwards

o
Provincial road maintenance
allocated provincially

o
Compete with Health, Education,
etc


National roads

o
Nationally allocated


www.aapa.asn.au

Road maintenance funding

AAPA 2011 Study Tour


Improving Pavement Performance #1


New bill


provincial road maintenance not from provincial fiscus


Nationally via SANRAL


BUT: Provincial authorities to have asset management
system in place + data < 2 years old


Capital projects still from provincial fiscus


Metros and municipalities to follow


Main reason


Roads national asset


Future or Road maintenance funding in
South Africa

Degree of Planning
Routine Maintenance Costs Per Year (R/m
2
)
Preventative Maintenance
Reactive Maintenance
Total Maintenance
Optimal
Zone
At SANRAL = R 4.50 / m
2
per year
AAPA 2011 Study Tour


Improving Pavement Performance #1

End of part 1