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R/W 15-33 Rehabilitation. Pavement Condition. North 8000 feet. North 3000 feet. NDT. Deflection Data Basin Area LTE Effective slab thickness Interlayer properties Subgrade support. Design Aircraft – B ???. Factors: E c Friction Subgrade k. - PowerPoint PPT Presentation
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R/W 15-33 Rehabilitation
Pavement Condition
North 3000 feet
North 8000 feet
NDT
Deflection Data•Basin Area•LTE•Effective slab thickness•Interlayer properties•Subgrade support
y = 0.0002x2 + 0.0052x + 0.0036R2 = 0.9988
0
0.5
1
1.5
2
2.5
3
0 20 40 60 80 100 120
RRS (in)
d
2kd
P
y = 0.0284x2 - 0.2891x + 0.992R2 = 0.9866
0
20
40
60
80
100
120
0 10 20 30 40 50 60 70
Basin Area
RR
S
Factors:Ec
FrictionSubgrade k
Design Aircraft – B ???
0 1 2 10
2 ...2* j j
SSBA D D D D D
D
*0
20
w Pk
w
100unloaded
loaded
LTE x
Average Values of NDT Parameters of R/W
15L-33R Parameter North 3000 ft Middle 5000 ft South 4000 ftArea (in.)
RRS (in.)
he (in.)
Dynamic k value (psi.in)
Interlayer friction coefficient
LTE (%)
# of Joints < 70%
Deflection Analysis
0
0.5
1
1.5
2
2.5
3
50 70 90 110
RRS - effective
Dim
en
sio
nle
ss
De
fle
cti
on
(F
ree
Ed
ge
)
AN225
A380
B 737
B777
B 757
B-747-400
DC-10-30
AN 124
B 777
Subgrade Stress Limits
UCCS, psi
½ UCCS,psi
Stress
Strain
Beginning of non-linearresponse
General Classification Approximate Resilient Modulus at a Deviatoric Stress of Approximately 6 psi
Approximate Unconfined Compressive Strength, psi
Stiff, fine-grained subgrade 12,350 33
Medium, fine-grained subgrade
7,680 23
Soft, fine-grained subgrade 3,020 13
Very soft, fine-grained subgrade
1,000 6
Present FEM Capability
Bonded Layers
132
11
3 321 2 2
1 2 21 2
1
212
2
na
e b
na
hx h
Eh h h
E E hh x h
E
13
3 321 2
1e u
Eh h h
E
Unbonded Layers
Partial Bond
c
e
e-p
hc he-p
Transformed Section
py 1e p e u e bh x h x h
e p e u
e b e u
h hx
h h
21e u
e p ee p
h
h
12e u c
e p e u ve u
s P h
h
21
12
e ue u e
e p
cv
h
h
h
P
Overlay Design – B ???
defl std devDesign relz
2 22
22
* 2
; free edge deflection1
0.0002 0.0052 0.0036
nLTE LTE
i ci i c
LTE LTE
feLTE fe
Var Var X Var LTE Var EX LTE E
Var k Vark
LTE
d
Middle 5000 feet98% Reliability
0.01.0
2.03.0
4.05.06.0
7.08.0
9.010.0
76.0% 78.0% 80.0% 82.0% 84.0% 86.0%
Restored LTE
Bo
nd
ed O
verl
ay T
hic
knes
s (i
n)
Minimum BCO Thickness
Joint LTE RestorationMiddle 5000 ft
Restored
LTE
Repair LTE # joints
80% <70%
83% <73%
85% <77%