02/13/03 1 AAR-410 FAA Airport Pavement FAA Airport Pavement Technology Program Technology Program Testing and preliminary data analysis from flexible pavements on low-strength subgrade (Construction Cycle Three (CC3)). Current work and plans for next rigid pavement test items.
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AAR-410 02/13/031 FAA Airport Pavement Technology Program u Testing and preliminary data analysis from flexible pavements on low-strength subgrade (Construction.
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02/13/03 1 AAR-410
FAA Airport PavementFAA Airport PavementTechnology ProgramTechnology Program
Testing and preliminary data analysis from flexible pavements on low-strength subgrade (Construction Cycle Three (CC3)).
Current work and plans for next rigid pavement test items.
02/13/03 2 AAR-410
P -401
P -209
P -154
P -154
P -154P -154
80 ft 20 ft60 ft
60 ft40 ft
Low-Strength SG Flexible Low-Strength SG Flexible Replacement – Fall 2002Replacement – Fall 2002
200Target Repetitions to Failure
11,000770 3,500
Thicknesses are based on 55,000 lb wheel load on 3 CBR subgrade.
5-in thick
8-in thick
43-in (110-cm) thick
34-in (85-cm) thick
24-in (60-cm) thick
16-in (40-cm) thick
6-Wheel
4-Wheel 370 2000 11,800 36,400
LFC1
LFC2
LFC3 LFC4
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Low-Strength SG ReworkLow-Strength SG Rework
02/13/03 4 AAR-410
Design MethodologyDesign Methodology
LEDFAA with 2-layer subgrade. Vary Poisson’s Ratio with subgrade strength:
Poisson’s Ratio = 0.82 – 0.1 * (logESG/145).
Improve behavior of failure model at low departure levels:
Variation of Asphalt Modulus Variation of Asphalt Modulus with Temperature (Witczak)with Temperature (Witczak)
1446225
1069375
764216
527830
352342
227314
141736
0
200000
400000
600000
800000
1000000
1200000
1400000
1600000
0 20 40 60 80 100 120
Temperature, deg. F
AC
Mod
ulus
, psi
02/13/03 8 AAR-410
Variation of Pavement Life Variation of Pavement Life with Temperature – LFC3, with Temperature – LFC3, from LEDFAAfrom LEDFAA
0
500
1000
1500
2000
2500
0 10 20 30 40 50 60 70 80 90 100
Pavement Temperature, deg. F
Num
bner
of
Pass
es to
Fai
lure
4-Wheel Gear
6-Wheel Gear
350-600 and 1200-2100
02/13/03 9 AAR-410
Testing ScheduleTesting Schedule September 3: started. September 4: stopped testing on LFC1. September 6: 990 passes. September 12: stopped testing on LFC2 at 3,168
passes. September 13 and 16: 2 test pits in LFC2. September 17: tried MWHGL wander on LFC3
and 4. September 18: increased load to 65,000 and
continued testing on LFC3 and 4 with old wander. October 18: stopped at 23,826 passes.
02/13/03 10 AAR-410
Asphalt TemperaturesAsphalt Temperatures
60
65
70
75
80
85
90
1 21 41 61 81
101
121
141
161
181
201
221
241
261
281
301
321
341
361
381
401
421
441
461
481
501
521
541
561
581
601
621
641
661
681
701
721
One-hour intervals from 0:00 Sunday September 1 to 23:00 Monday 30, 2002
P-4
01 T
emp
erat
ure
s, d
egre
es F
LFC3 NA
LFC3 NB
LFC3 NC
LFC3 SA
Surface 1
LFC3 SC
Time
02/13/03 11 AAR-410
Pavement at 19,500 PassesPavement at 19,500 Passes
02/13/03 12 AAR-410
North, 6-Wheel TrackNorth, 6-Wheel Track
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South, 4-Wheel TrackSouth, 4-Wheel Track
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Rut Depths from StraightedgeRut Depths from StraightedgeCC-3 RUT DEPTH MEASUREMENTS
0.1
1
10
10 100 1000 10000 100000
Passes
Rut
Dep
th, i
nch
LFC-1:North LFC-1:South
LFC-2:North LFC-2:South
LFC-3:North LFC-3:South
LFC-4:North LFC-4:South
Tried different wander. Then increased load to 65,000 lbs
02/13/03 15 AAR-410
Rut Depths from StraightedgeRut Depths from StraightedgeCC-3 RUT DEPTH MEASUREMENTS
0
1
2
3
4
5
6
7
8
10 100 1000 10000 100000
Passes
Rut
Dep
th, i
nch
LFC-1:North LFC-1:South
LFC-2:North LFC-2:South
LFC-3:North LFC-3:South
LFC-4:North LFC-4:South
Tried different wander. Then increased load to 65,000 lbs
02/13/03 16 AAR-410
LFC3 - Upheaval on North TrackLFC3 - Upheaval on North Track
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LFC3 - Upheaval on South TrackLFC3 - Upheaval on South Track
02/13/03 18 AAR-410
Laser Profiler – 21.5 ft Span, Laser Profiler – 21.5 ft Span, 8 in Range8 in Range
Starting Excavation of TrenchStarting Excavation of Trench
02/13/03 31 AAR-410
Current Proposal for Rigid Current Proposal for Rigid Reconstruction (1)Reconstruction (1) 15 ft x 15 ft (4.5 m x 4.5 m) slabs. 3-Part optimized mix. 28-day wet burlap cure. Transverse joints doweled.
02/13/03 32 AAR-410
Current Proposal for Rigid Current Proposal for Rigid Reconstruction (2)Reconstruction (2)
Looked at decreasing strength and increasing thickness: Rounded intermediate aggregate, no
significant decrease. 30%, and 50% Class C flyash replacement
in a two-part mix (batched 1/13/03), significant decrease at 50%.