Transcript LIFE-365 Service Life Prediction Model for Concrete Structures

LIFE-365 Service Life Prediction
Model for Concrete Structures
Richard Stehly, PE, FACI
Jessi Jackson
Current Costs, Minnesota
$/Ton
$/lb.
Portland
Cement
Slag
80
0.04
70
0.035
Fly Ash
30
0.015
Silica Fume
DCI(3 gal)
$/Gallon
0.40
$/cubic yard
17
4
17
MCI 2005
16.25
MCI 2006
18
LIFE-365 Parking Ramp
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•
•
•
•
•
8” deck, 2” of cover
1.2% Steel
75 Year Design Life
3% Discount Rate
0.45 W/C
Minneapolis, Minnesota
Description of Structure
Properties of Scenarios
15% Fly
Ash
Mix Design : w/cm = 0.45, Cost
Fly ash = 15 %
D28 = 1.05x10
-11
73 $/yd
3
2
m /s , m = 0.32 , Ct = 0.05 %wt conc
Black Steel (0.45 $/lb) , Propagate = 6 years
8.0
Clear Cover
= 2.00 in
5% Silica
Fume
Mix Design : w/cm = 0.45, Cost
Silica fume = 5 %
D28 = 4.60x10
Volumetric
r = 1.2 %
-12
73 $/yd
3
2
m /s , m = 0.20 , Ct = 0.05 %wt conc
Black Steel (0.45 $/lb) , Propagate = 6 years
Base Case
Mix Design : w/cm = 0.45, Cost
D28 = 1.05x10
-11
70 $/yd
3
2
m /s , m = 0.20 , Ct = 0.05 %wt conc
Black Steel (0.45 $/lb) , Propagate = 6 years
DCI 3 Gal
Design Life = 75 years
Mix Design : w/cm = 0.45, Cost
D28 = 1.05x10
-11
87 $/yd
3
2
m /s , m = 0.20 , Ct = 0.24 %wt conc
Black Steel (0.45 $/lb) , Propagate = 6 years
DCI / Rheocrete CNI : 3 gal/yd3
Discount Rate = 3.0
Rheocrete
222+
Mix Design : w/cm = 0.45, Cost
D28 = 9.42x10
-12
87 $/yd
3
2
m /s , m = 0.20 , Ct = 0.12 %wt conc
Black Steel (0.45 $/lb) , Propagate = 6 years
Rheocrete 222+ : 1 gal/yd3
Surface History (Total)
Cost
User - MCI
2006
Cost
Annual Temp. History
Temperature (deg F)
0.8
Surface Conc (%wt conc)
User - MCI
2005
0.6
0.4
0.2
0.0
60
3
86 $/yd , D28 = 1.05x10
-11
2
m /s
m = 0.20 , Ct = 0.18 %wt conc , Propagate = 30 years
3
88 $/yd , D28 = 1.05x10
-11
2
m /s
m = 0.20 , Ct = 0.18 %wt conc , Propagate = 72 years
40
20
Parking Garage
0
0
20
40
years
60
0
2
4
6
Month Number
8
10
Jessi
2001/2/23
Project Title:
Performed by:
Parking Garage
Jessi
Date:
2001/2/23 - 3:35 pm
Structure:
Location:
Clear cover:
1D slab/wall structure
MINNEAPOLIS , Minnesota
2.00 in
Exposure:
Parking Garages
1 %wt conc @ 13 years
Design Life:
75 years
Discount Rate:
3.0 %
Scenario
Name
Initial
Cost
2
Repair
Cost
2
Repair
Area
Repair
Interval
Time to
Initiation
Total Life
Cycle Cost
(years)
Time to
st
1 Repair
(years)
(years)
2
($/ft )
($/ft )
(%)
DCI 3 Gal
3.93
25.00
10
10
18.2
24.2
7.62
Rheocrete
222+
3.93
25.00
10
10
18.6
24.6
7.57
5% Silica
Fume
3.58
25.00
10
10
13.6
19.5
8.13
15% Fly
Ash
3.58
25.00
10
10
11.9
17.8
8.37
Base Case
3.51
25.00
10
10
8.1
14.1
8.86
*User MCI 2006
3.95
25.00
10
10
15.1
87.1
3.95
*User MCI 2005
3.90
25.00
10
10
15.1
45.1
5.42
* Input Parameters (D, m, C t) selected by user.
($/ft )
LIFE-365 Bridge
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•
•
•
•
•
•
12” Thick, 3” Cover
1.2% Steel
1% Chlorides @ 20 years
100 Year Design Life
3% Discount Rate
0.32 W/C
Minneapolis, Minnesota
Description of Structure
Properties of Scenarios
Base Case
Mix Design : w/cm = 0.32, Cost 95 $/yd
-12
D28 = 5.11x10
12.0
Clear Cover
= 3.00 in
2
m /s , m = 0.20 , Ct = 0.05 %wt conc
Black Steel (0.45 $/lb) , Propagate = 6 years
DCI 3
Gal.
Volumetric
r = 1.2 %
Mix Design : w/cm = 0.32, Cost 112 $/yd
-12
D28 = 5.11x10
3
2
m /s , m = 0.20 , Ct = 0.24 %wt conc
Black Steel (0.45 $/lb) , Propagate = 6 years
DCI / Rheocrete CNI : 3 gal/yd3
Rheocrete
222+
Design Life = 100 years
Mix Design : w/cm = 0.32, Cost 112 $/yd
-12
D28 = 4.59x10
3
2
m /s , m = 0.20 , Ct = 0.12 %wt conc
Black Steel (0.45 $/lb) , Propagate = 6 years
Rheocrete 222+ : 1 gal/yd3
Discount Rate = 3.0
Surface History (Total)
3
3
-12
User - MCI
2005
Cost 111 $/yd , D28 = 5.11x10
User - MCI
2006
Cost 113 $/yd , D28 = 5.11x10
2
m /s
m = 0.20 , Ct = 0.18 %wt conc , Propagate = 30 years
3
-12
2
m /s
m = 0.20 , Ct = 0.18 %wt conc , Propagate = 72 years
Annual Temp. History
Temperature (deg F)
Surface Conc (%wt conc)
1.0
0.8
0.6
0.4
0.2
0.0
60
40
20
Bridge
0
0
20
40
years
60
80
100
0
2
4
6
Month Number
8
10
Jessi
2001/2/23
Project Title:
Performed by:
Bridge
Jessi
Date:
2001/2/23 - 3:42 pm
Structure:
Location:
Clear cover:
1D slab/wall structure
MINNEAPOLIS , Minnesota
3.00 in
Exposure:
Urban Highway Bridges
1 %wt conc @ 20 years
Design Life:
100 years
Discount Rate:
3.0 %
Scenario
Name
Initial
Cost
2
Repair
Cost
2
Repair
Area
Repair
Interval
Time to
Initiation
Total Life
Cycle Cost
(years)
Time to
st
1 Repair
(years)
(years)
2
($/ft )
($/ft )
(%)
DCI 3
Gal.
6.82
25.00
10
10
51.1
57.1
8.07
Rheocrete
222+
6.82
25.00
10
10
46.2
52.2
8.43
Base Case
6.19
25.00
10
10
23.4
29.4
9.77
*User MCI 2006
6.85
25.00
10
10
41.4
113.4
6.85
*User MCI 2005
6.79
25.00
10
10
41.4
71.4
7.48
* Input Parameters (D, m, C t) selected by user.
($/ft )
LIFE-365 Piling
• 24” Thick, 1.5” Cover
• 1.2% Steel
• 1.9% Chlorides in 1 year (amount of Cl- in
seawater)
• 75 Year Design Life
• 3% Discount Rate
• 0.4 W/C
• 800 m from ocean
• Tampa, Florida
Description of Structure
Properties of Scenarios
Clear Cover
= 1.50 in
15% Fly
Ash
Mix Design : w/cm = 0.40, Cost 87 $/yd
Fly ash = 15 %
D28 = 7.94x10
-12
3
2
m /s , m = 0.32 , C t = 0.05 %wt conc
Black Steel (0.45 $/lb) , Propagate = 6 years
24.0
Base Case
D28 = 7.94x10
-12
3
2
m /s , m = 0.20 , C t = 0.05 %wt conc
Black Steel (0.45 $/lb) , Propagate = 6 years
DCI 3 Gal
Volumetric
r = 1.2 %
Annual Temp. History
80
Temperature (deg F)
1.8
1.5
1.2
0.9
0.6
0.3
0.0
2
m /s , m = 0.20 , C t = 0.24 %wt conc
Mix Design : w/cm = 0.40, Cost 87 $/yd
D28 = 7.15x10
-12
3
2
m /s , m = 0.20 , C t = 0.12 %wt conc
Black Steel (0.45 $/lb) , Propagate = 6 years
Rheocrete 222+ : 1 gal/yd3
Discount Rate = 3.0
Surface History (Total)
-12
3
Black Steel (0.45 $/lb) , Propagate = 6 years
DCI / Rheocrete CNI : 3 gal/yd3
Rheocrete
222+
Design Life = 75 years
Mix Design : w/cm = 0.40, Cost 87 $/yd
D28 = 7.94x10
24.0
Surface Conc (%wt conc)
Mix Design : w/cm = 0.40, Cost 70 $/yd
3
User - MCI
2005
Cost 86 $/yd , D28 = 7.94x10
User - MCI
2006
Cost 88 $/yd , D28 = 7.94x10
-12
2
m /s
m = 0.20 , C t = 0.18 %wt conc , Propagate = 30 years
3
-12
2
m /s
m = 0.20 , C t = 0.18 %wt conc , Propagate = 72 years
60
40
20
Piling
0
0
2
4
years
6
8
10
0
2
4
6
Month Number
8
10
Jessi
2001/2/23
Project Title:
Performed by:
Piling
Jessi
Date:
2001/2/23 - 3:54 pm
Structure:
Location:
Clear cover:
2D rectangular structure
TAMPA , Florida
1.50 in
Exposure:
Within 800 m of Ocean
2 %wt conc @ 1 years
Design Life:
75 years
Discount Rate:
3.0 %
Scenario
Name
Initial
Cost
2
Repair
Cost
2
Repair
Area
Repair
Interval
Time to
Initiation
Total Life
Cycle Cost
(years)
Time to
st
1 Repair
(years)
(years)
2
($/ft )
($/ft )
(%)
Base Case
10.52
100.00
10
10
0.8
6.8
38.43
Rheocrete
222+
11.78
100.00
10
10
1.7
7.7
39.01
DCI 3 Gal
11.78
100.00
10
10
1.6
7.5
39.09
15% Fly
Ash
11.78
100.00
10
10
1.1
7.1
39.49
*User MCI 2006
11.85
100.00
10
10
1.4
73.4
11.85
*User MCI 2005
11.71
100.00
10
10
1.4
31.4
22.41
* Input Parameters (D, m, C t) selected by user.
($/ft )