Transcript Slide 1

Committee 140
Life Cycle Performance & Cost
Paul Tourney - Chair
Peter DeNicola
“You Call It Sustainability, We Call It Concrete Repair”
Committee 140 - Life Cycle Performance & Cost
MISSION
Provide industry guidance for decisions based on both the
service extension and economic impact of concrete
repairs.
GOALS
Develop technical guideline on managing the serviceability
of concrete structures through a “cradle to grave”
approach using preventative maintenance systems and
quality concrete repairs.
Committee 140 - Life Cycle Performance & Cost
Current Membership:
Paul Tourney
Pete DiNicola
Dale Campbell
Jason Dunster
Kevin Earley
Eric Edelson
Greg Gilmor
Fred Goodwin
Joshua Hollis
Graeme Jones
Richard McGuire
Mike Parker
Chris Perego
Matt Sherman
Consulting Members:
Frank Apicella
James McDonald
Jessi Meyer
Committee 140 - Life Cycle Performance & Cost
Expanded Objectives:
• Use excellent work efforts of other ICRI committees.
• Develop tools for owners and engineers to promote and justify
better concrete repairs.
– Decision Tree on “Cradle to Grave” of structures and the maintenance
options.
– Guidelines for use of the decision tree system.
– Provide a series of project case studies for demonstration of SLP / LCCA for
optimal management of concrete structure assets.
• Liaison with ACI and ISO Committees to build consensus.
Importance of Concrete
Repair Sustainability
Type of Structure
#New
#Existing
Grade
Highway Bridges
Highway Roads
Parking Garages
Dams
1,000
X
400
10
600,000+
100X
25,000+
4,000
C
DC
D
Importance of Concrete
Repair Sustainability
Type of Structure
#New
#Existing
Grade
Highway Bridges
Highway Roads
Parking Garages
Dams
1,000
X
400
10
600,000+
100X
25,000+
4,000
C
DC
D
#1
#2
Build new structures to last longer!
Maintain and repair existing structures to significantly
extend the time to subsequent repair.
The backlog numbers are against us!!
Balance of Asset Management of Existing Structures:
Periodic Evaluations
Repair Service Life
Life Cycle
Cost
TIME LINES of LCCA
Activity Time Line
Service Life Predictions
Cost Time Line
All Documents
Existing Structure
“Birth Certificates” Building Code
New Structure
TIME LINES of LCCA
Option 1
Option 2
Option 3
Option 4
SLM
$
Life Cycle Costing
Net Present Value (NPV)
NPV = Today Cost /(1 + Effective Interest Rate (i)) **(years from today)
• What is the $$$ needed to put away today to take
care of facility for the expected service life?
• Related to the opportunity cost. General rules.
– Dollars spent in the future is lower cost than dollars spent today.
• Higher the interest rate the greater the premise.
– Dollars NOT spent today will result in high Life Cycle Costs.
Life Cycle Cost Analysis (LCCA)
Discount Rate = i
$Z
$Y
$X
T1
T2
T3
NPV = [$X/ (1+i)T1 + $Y/ (1+i)T2 + $Z/ (1+i)T3]
Life Cycle Cost Analysis (LCCA)
Discount Rate = i
New
$U
$V
$W
$X
$Y
$Z
Today
T1
T2
T3
T4
T5
T6
NPVLife = [$U/ (1+i)T1 + $V/ (1+i)T2 + $W/ (1+i)T3] + ….
NPVToday = [$U + $V/ (1+i)T3-T2 + $W/ (1+i)T4-T3] + ….
Case 1
End of Serviceability
X
Repairs
4
Damage
3
2
New
Construction
Chloride
Contamination
Period
I
Corrosion
Damage
Repaired
Damage
Corrosion
Initiation
TIME
Ref. Tuutti
Case 1
End of Serviceability
X
Repairs
4
2
New
Construction
Chloride
Contamination
Period
Cost
Damage
3
I
Corrosion
Damage
Repaired
Damage
Corrosion
Initiation
Current Cost
TIME
Ref. Tuutti
Case 1
End of Serviceability
X
i = 7.5%
4
3
2
NPVToday = 1.024
Cost
Damage
NPVLife = 0.168
I
0.6
0.5
Today
0.4
0.3
New
T
25
TIME
+5
+5
+5
Ref. Tuutti
Case 2
End of Serviceability
X
Damage
Repairs
Corrosion
Damage
I
New
Construction
Chloride
Contamination
Period
Corrosion
Initiation
Repaired
Damage
TIME
Ref. Tuutti
Case 2
End of Serviceability
X
Corrosion
Damage
I
Cost
Damage
Repairs
New
Construction
Chloride
Contamination
Period
Corrosion
Initiation
Current Cost
Repaired
Damage
TIME
Ref. Tuutti
Case 2
End of Serviceability
X
i = 7.5%
NPVToday = 0.70
I
Cost
Damage
NPVLife = 0.115
0.7
Today
New
T
25
TIME
Ref. Tuutti
Case 3
Damage
End of Serviceability
X
Preventative
Maintenance
Corrosion
Damage
New
Construction
Corrosion
Initiation
Chloride
Contamination
Period
Repair
I
P
P
TIME
Ref. Tuutti
Case 3
X
Preventative
Maintenance
Cost
Damage
End of Serviceability
Corrosion
Damage
New
Construction
Corrosion
Initiation
Chloride
Contamination
Period
Repair
Current Cost
I
P
P
TIME
Ref. Tuutti
Case 3
End of Serviceability
i = 7.5%
[Case 1 = 0.168] [Case 3 = 0.115]
NPVToday = 0.146
[Case 1 = 1.024] [Case 3 = 0.70]
Preventative
Maintenance
Today
New
0.1
0.1
P
12
0.3
I
T
P
8
5
TIME
+10
Ref. Tuutti
Cost
Damage
NPVLife = 0.089
Life Cycle Cost Comparison
NPV (Life)
NPV (Today)
Case 1
0.168
1.024
Case 2
0.115
0.700
Case 3
0.089
0.146
All Documents
Existing Structure
“Birth Certificates” Building Code
New Structure
TIME LINES of Service Life
Option 1
Option 2
Option 3
Option 4
SLM
$