DISCLAIMER - University of Saskatchewan 2012/C_Prang.pdf · Transportation Research Centre Integration of Structural information into COS Asset Management System 2 Acknowledgements

CE990 Graduate Seminar Presentations

DISCLAIMER

The presentation materials shown in this file were prepared by graduate

engineering students for educational purposes within the Department of Civil and

Geological Engineering at the University of Saskatchewan. The quality and

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efforts have been made to this end. The practice of professional engineering in

Canada can only be undertaken by appropriately licensed professional engineers

therefore all contents of this presentation, including all data, figures, drawings,

findings and cost estimates cannot be used, in whole or in part, for the design

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Further, any use of the information contained in this file should be cleared with

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Integration of Structural Information into an Urban Asset Management System

By Colin Prang, M.Sc. Candidate, Final Year

February 3, 2012

TransportationResearch

CentreIntegration of Structural information into COS Asset Management System 2

Acknowledgements

Sponsor of Research: City of Saskatoon. Supervisor: Curtis F. Berthelot. Committee:

Murray Totland,

Gordon Sparks,

Jan-Mark Gustafson



Background

Several premature roadway failures in Saskatoon

2000 Heritage Way (failure after 11 years)

2003 Heritage Cr. (failure after 7 years)



Background



Background

In 2004 Edson Street failed due to loss of structural capacity caused by:

• High water table

• Fine grained sub grade

• Slow moving, heavy loads

The reconstruction utilized sub surface drainage, a geotextile on the sub grade for separation, and a geogrid within the base layer for strength.



Background

Problem:

Several City of Saskatoon Streets are structurally failing less than 20 years after construction

• Attridge Drive in 2005 (4 years old)

• Nemeiben Rd. in 2005 (16 years old)

• Emmiline Rd. in 2006 (17 years old)

• Braeburn Cr in 2007 (16 years old)

2007 Surface Condition Survey


Centre

Erindale Road Condition

Integration of Structural information into an Urban Pavement Management System 7


CentreCOS Roadway Construction Standards

8

Geosynthetics


CentreCOS Roadway Construction Standards

9

Geotextiles with subsurface drainage


Centre

Development of a Structural Asset Management System for Urban Pavements 10


CentreIntegration of Structural information into an Urban Pavement Management System 11

Background

Goal: To incorporate structural evaluation measures to improve the optimization of roadway expenditures within the COS’s current asset management system.

Quantify benefits of structural information with regards to:

1) Improved treatment selection

2) Improved performance prediction models

3) Improved structural design processes


Centre

Network Level Condition

HWD Testing (2006 – 2010)


Segments tested Total HWD tests% Network Tested

Locals 189 2,898 6.6%

Collectors 149 2,485 36.8%

Total 338 5,383 10.0%


CentreIntegration of Structural information into an Urban Pavement Management System 13

Work Completed



Network Level Condition

Distribution of Peak Surface Deflections - Locals

Good Fair Poor Very Poor


Centre

Semi-Network



Centre

Semi-Network


4

143

25

6

44

7

3

13

3

4

12

1

4

8

73

5

6

10

2128

7 4322

5

45

21

14

29

4

19

62

17

55

13

60

65

42

39

164652

15

68

53

49

67

32

63

8

44

58

24

2

23

51

38

59

27

11

10

56

12

52

8th St E

<Incorrect>

Boy

chuk

Dr

Taylor St E

Bria

rgat

e R

d

Braeside View

Brookhurst Cres

Banyan Cres

Blackburn Cres

Briarwood Rd

Brookmore Cres

Beech

dale Cres

Beechmont Lane

Beechmont Cres

Bayfield Cres

Blac

ktho

rn C

res

Brookhurst Lane

Brookshire C

res

Bellmont Cres

Bla

cksh

i re C

res

<unamed>

Briarvale Rd

Brookdale Cres

Braeburn Cres

Bayview Cres

Braeshire Lane

Brookmore Lane

Heritage Cres

Beechdale W

ay

Heritage Green

Bayv

iew

Ter

r

Bayview Close

Beechwood Cres

Bellmont Crt

Bro

okm

ore

View

Bee

chda

le C

rt

Beechmont Terr

Herold Rd

Bayfield Pl


Centre

Semi-Network


Surface condition compared to structural condition


Centre

Project Level Condition



Centre




Centre



Very

Poor

Poor

Fair

Good


Centre


Greaves Crescent in Willowgrove (7 years after construction)




Financial Implications

Several neighborhoods in Saskatoon have been constructed with insufficient structural capacity.

Life cycle costing was used to estimate an annual liability of $8.13 million over a 56 year period for existing poorly constructed locals.



Solutions

Urban roads are typically constructed level to their surroundings Wet granular base has significantly less stiffness than base at

optimum moisture. Thin structures, such as locals, rely on the sub grade for support Sub surface drainage layers have been found to be effective at

removing free water, adding structural support, and maintaining structural stiffness thus prolonging the service life.

The use of geotextile adds further strength and separation of materials that adds longevity.



Conclusion

Preservation and restoration treatments are less effective when a roadway is structurally deteriorated.

This research has shown that observed cracking is a poor indicator of structural condition.

Knowledge of existing structurally deficient roadways would improve transit route planning, detours, load management, as well as material selection and structural design.

It was found that an additional $1,525 per serviced lot will save $746 per year in future maintenance. (40% ROI!!!)

This research found that the integration of structural information into the COS asset management system will improve the life cycle performance, level of service, and funding optimization of roadway expenditures.

Discussion

Documents

DISCLAIMER - University of Saskatchewan 2012/C_Prang.pdf · Transportation Research Centre Integration of Structural information into COS Asset Management System 2 Acknowledgements