slide1 n.
Download
Skip this Video
Loading SlideShow in 5 Seconds..
O PTIMIZED P AVEMENT D ESIGN W ITH R ESPECT TO Q UALITY AND E CONOMY PowerPoint Presentation
Download Presentation
O PTIMIZED P AVEMENT D ESIGN W ITH R ESPECT TO Q UALITY AND E CONOMY

Loading in 2 Seconds...

play fullscreen
1 / 27

O PTIMIZED P AVEMENT D ESIGN W ITH R ESPECT TO Q UALITY AND E CONOMY - PowerPoint PPT Presentation


  • 202 Views
  • Uploaded on

O PTIMIZED P AVEMENT D ESIGN W ITH R ESPECT TO Q UALITY AND E CONOMY. J. Litzka. Institute for Road Construction and Maintenance Vienna University of Technology. General objective of pavement design. Structural efficiency during the whole design period Based on given random conditions.

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about 'O PTIMIZED P AVEMENT D ESIGN W ITH R ESPECT TO Q UALITY AND E CONOMY' - blake


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
slide1

OPTIMIZED PAVEMENT DESIGNWITH RESPECTTOQUALITY AND ECONOMY

J. Litzka

Institute for Road Construction and MaintenanceVienna University of Technology

slide2

General objective of pavement design

  • Structural efficiency during the whole design period
  • Based on given random conditions
  • Design traffic load
  • Bearing capacity of subgrade
  • Material properties of pavement layers

2

J. LITZKA - OPTIMIZED PAVEMENT DESIGN WITH RESPECT TO QUALITY AND ECONOMY

slide3

For routine application (1)

  • Average or minimum values of
  • Subgrade
  • Material properties and fatigue behaviour
  • Pavement design according to given design traffic (load class)
  • e.g. catalogue type

(like Austrian RVS 3.63, based on analytical calculations)

3

J. LITZKA - OPTIMIZED PAVEMENT DESIGN WITH RESPECT TO QUALITY AND ECONOMY

slide4

For routine application (2)

  • Resulting in a number of technically equivalent pavement solutions
  • Based on availability of materials and/or on cost comparison the optimal solution can be selected together with possible alternatives
  • But still a general solution based on plausible assumptions, not always most cost effective

4

J. LITZKA - OPTIMIZED PAVEMENT DESIGN WITH RESPECT TO QUALITY AND ECONOMY

slide5

Design table RVS 3.63, bituminous pavements

5

J. LITZKA - OPTIMIZED PAVEMENT DESIGN WITH RESPECT TO QUALITY AND ECONOMY

slide6

Possible improvement of economic efficiency (1)

  • Specific analytical design using the underlying procedure for the catalogue, but
  • Real given values of bearing capacity of subgrade, material characteristics of layers, specific fatigue laws
  • Also possibility to include new, innovative, not standardised materials

6

J. LITZKA - OPTIMIZED PAVEMENT DESIGN WITH RESPECT TO QUALITY AND ECONOMY

slide7

Possible improvement of economic efficiency (2)

Example

7

J. LITZKA - OPTIMIZED PAVEMENT DESIGN WITH RESPECT TO QUALITY AND ECONOMY

slide8

s

(t)

e

(t)

Essential precondition

  • Exact and reliable information about input characteristics
  • Performance orientated laboratory tests (stiffness modulus, fatigue behaviour etc.)
  • Traffic forecast of high accuracy

8

J. LITZKA - OPTIMIZED PAVEMENT DESIGN WITH RESPECT TO QUALITY AND ECONOMY

slide9

Benefits of specific pavement design

  • Better adaptation to existing subgrade situation
  • Better utilisation of material properties
  • Possibility for innovative materials and solutions
  • Alternative bids
  • Performance related contracts

9

J. LITZKA - OPTIMIZED PAVEMENT DESIGN WITH RESPECT TO QUALITY AND ECONOMY

slide10

but: Do not overlook the

right moment

Further advantage of specific analytical design

  • Stage by stage construction
  • Stage 1 as basic solution for first part of design period
  • Stage 2 designed based on existing layer properties and realistic design traffic
  • Better reliability and also acting as maintenance procedure

10

J. LITZKA - OPTIMIZED PAVEMENT DESIGN WITH RESPECT TO QUALITY AND ECONOMY

slide11

Consideration of costs

  • Construction costs
  • Life-cycle costs
  • Construction
  • Maintenance
  • Routine
  • Rehabilitation including
  • Traffic management at construction sites
  • Methods/measures
  • Intervals
  • Additional user costs (e.g. time loss)
  • Environmental costs (possibly)

11

J. LITZKA - OPTIMIZED PAVEMENT DESIGN WITH RESPECT TO QUALITY AND ECONOMY

slide12

Calculation of life-cycle costs

  • Prognosis of development of pavement condition necessary
  • Prediction of life time, change of condition indicator-values and thus prediction of time and type of maintenance measure

Basic tasks for PMS/e.g. VIAPMS

12

J. LITZKA - OPTIMIZED PAVEMENT DESIGN WITH RESPECT TO QUALITY AND ECONOMY

slide13

Change of approach and responsibilities

Actual:

  • Only construction costs considered
  • Client chooses contractor according to cost comparison
  • Sometimes alternatives compared

New approach (even if normal tender):

  • Consider life-cycle costs
  • At least for road owner costs

(construction and maintenance)

13

J. LITZKA - OPTIMIZED PAVEMENT DESIGN WITH RESPECT TO QUALITY AND ECONOMY

slide14

For functional contracts (PPP)

  • Responsibility of concessionaire/contractor to consider
  • Complete life-cycle costs
  • Including additional user costs
  • (e.g. loss of toll/fee during rehabilitation works, closures)
  • Normally compliance with trigger values of pavement condition required

14

J. LITZKA - OPTIMIZED PAVEMENT DESIGN WITH RESPECT TO QUALITY AND ECONOMY

slide15

Functional contracts - example

5,0

Threshold level

V

very poor

4,5

4,0

IV

poor

Warning level

3,5

3,0

III

fair

condition index CI [-]

2,5

2,0

II

good

1,5

I

very good

1,0

condition

class

35

5

10

15

20

0

technical parameter [mm]

15

J. LITZKA - OPTIMIZED PAVEMENT DESIGN WITH RESPECT TO QUALITY AND ECONOMY

slide16

Most crucial point: Performance models

  • Standard- type pavements, traditional materials
  • Empiric results from database analysis
  • But still more risks compared with routine application within maintenance planning
  • Starting from new pavement
  • No calibration of performance models to actual measurements possible

16

J. LITZKA - OPTIMIZED PAVEMENT DESIGN WITH RESPECT TO QUALITY AND ECONOMY

slide17

Most crucial point: Performance models (2)

  • Innovative, new materials and pavements
  • Prognosis based on analytical calculation
  • First assumption based on existing empiric functions and adaptation by periodic condition measurements (normally required in any case)

With this also required minimum quality of road condition secured

17

J. LITZKA - OPTIMIZED PAVEMENT DESIGN WITH RESPECT TO QUALITY AND ECONOMY

slide18

Optimized solution

  • Construction costs
  • Maintenance costs

including additional user costs

Minimum life-cycle costs

  • Most economic solution
  • In compliance with given quality requirements

18

J. LITZKA - OPTIMIZED PAVEMENT DESIGN WITH RESPECT TO QUALITY AND ECONOMY

slide19

Development Pavement Condition – Concrete Pavement

Threshold Level

Concrete Pavement

Exchange of distressed slabs and thin bit. overlay

Bit. Base Course

Subbase

Warning Level

19

J. LITZKA - OPTIMIZED PAVEMENT DESIGN WITH RESPECT TO QUALITY AND ECONOMY

slide20

Wearing Course

Threshold Level

Bit. Base Course

Overlay

Reinforcement

Base Course

Subbase

Warning Level

Development Pavement Condition – Asphalt Pavement

Total thickness according to design

20

J. LITZKA - OPTIMIZED PAVEMENT DESIGN WITH RESPECT TO QUALITY AND ECONOMY

slide21

Wearing Course

Threshold Level

Reinforcement (2nd construction stage)

Bit. Base Course

Base Course

Overlay

Subbase

Warning Level

Development Pavement Condition – Asphalt Pavement

2-stage pavement construction

21

J. LITZKA - OPTIMIZED PAVEMENT DESIGN WITH RESPECT TO QUALITY AND ECONOMY

slide22

Overlay

Replacement of distressed slabs and thin overlay

Overlay

Reinforcement

Reinforcement

(2nd construction stage)

Comparison Total Costs (including user costs)

22

J. LITZKA - OPTIMIZED PAVEMENT DESIGN WITH RESPECT TO QUALITY AND ECONOMY

slide23

Conclusions (1)

Optimized pavement design

necessary with respect to

  • Increased traffic loads
  • Limited budgets
  • Saving of resources
  • Minimised impact to road users

(important for toll roads)

23

J. LITZKA - OPTIMIZED PAVEMENT DESIGN WITH RESPECT TO QUALITY AND ECONOMY

slide24

Conclusions (2)

Optimized pavement design

possible by applying

  • Improved design methods
  • Improved materials
  • Long life, modular pavements
  • Improved construction quality

(very important)

24

J. LITZKA - OPTIMIZED PAVEMENT DESIGN WITH RESPECT TO QUALITY AND ECONOMY

slide25

Conclusions (3)

Optimized pavement design

necessary and possible if

  • Normal contract
  • Administration responsible for design and maintenance
  • Functional contracts (PPP)
  • Concessionaire responsible for design, construction and maintenance over the full concession period together with guaranteed remaining lifetime after termination of contract

25

J. LITZKA - OPTIMIZED PAVEMENT DESIGN WITH RESPECT TO QUALITY AND ECONOMY

slide26

Conclusions (4)

For optimized pavement design

necessary in any case

  • Improved, innovative materials
  • Improved, performance related laboratory tests
  • High quality of construction
  • Optimal maintenance organisation

and

Enough time for development of alternative solutions and attributed laboratory tests and calculations during the bidding process

26

J. LITZKA - OPTIMIZED PAVEMENT DESIGN WITH RESPECT TO QUALITY AND ECONOMY

slide27

Thank you for your attention

27

J. LITZKA - OPTIMIZED PAVEMENT DESIGN WITH RESPECT TO QUALITY AND ECONOMY