Larkin-FAA Pavement Grooving
Transcript of Larkin-FAA Pavement Grooving
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FAA Pavement Grooving RequirementsApril 2010
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Presentation Outline FAA Rationale for Groove Requirements
Previous FAA Pavement Grooving
Standards
Current FAA Pavement Grooving Standards
Groove Measuring Methods
Comparison of Manual versus AutomatedGroove Measurements
Summary Acknowledgements
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FAA Airport Pavement Grooving
Requirements
Paragraph 2-15 of FAA AC 150/5320-12C
states: Cutting or forming grooves inexisting or new pavement is a proven andeffective technique for providing skid-resistance and prevention of hydroplaning
during wet weather. Grooving of all runways,.. serving ..turbojet
aircraft, is considered high priority safety
work and should be accomplished duringinitial construction.
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FAA Airport Pavement Grooving
Requirements, cont.
Paragraph 2-16 of FAA AC 150/5320-12C suggests
considering the following for other runways:- History of aircraft hydroplaning,
- annual rainfall rates and intensity,
- surface abnormalities impeding runoff,
- surface texture such as contaminant,
- crosswind effects,
- dropoffs at the end of the runway safety areas,
etc.
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Previous FAA Groove Standards
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Current FAA Groove Standards
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Field Measuring of Pavement Grooves
In September 2008, representatives from aUS airport contacted the FAA to help
resolve a dispute between the airport and acontractor constructing a runway. Thedispute centered on whether the contractor
saw-cut the grooves in rigid pavementaccording to the AC.
The challenge to the FAA was to determine
an appropriate method of measuring theconstructed grooves for compliance with
the AC.
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Field Measuring of Pavement Grooves
Furnish a grooving profiling procedure ofthe runway.
This procedure would have to determine thenecessary sample size to ensure astatistically significant confidence level.
A 12,000 ft. runway can have approximately95,000 grooves, this procedure had toaccommodate a similar population.
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Groove Measurement Methods Two methods were identified;
a manual method measuring the depth,width, and separation of individual groovesusing a depth gage and calipers and,
a method using a laser displacement sensoraffixed to a passenger vehicle.
both methods were compared to each other
on the same slab and in the same line.
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Manual Groove Measurement
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Manual Depth Gage Measurements
Groove Measurement Worksheet
Distance Depth by Depth byGroove Between Width Gage SELCOM
Number (in.) (in.) (in.) ProFAA
(in.)
01 1.306 0.159 0.1872 0.1638
2 1.321 0.17 0.1806 0.1615
3 1.314 0.186 0.1786 0.1649
4 1.322 0.177 0.1705 0.1706
5 1.322 0.175 0.1472 0.1367
6 1.314 0.185 0.1308 0.1163
7 1.306 0.187 0.1489 0.1468
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Laser Groove Measurement
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Laser Displacement Sensor
Specifications
Manufacturer/Model: LMI Selcom 2207-
200/325 Spot size: 0.04 in (1mm)
Range: 8 in. (200mm)
Resolution: 0.002 in (0.049mm) (12 bits) Primary sample rate: 32 kHz
Storage sample rate: 8 kHz (11 samples/in at
40 mph) New system samples and stores at 64 kHz
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ProGroove Grooving Data
A 13,000 ftrunway has
about
104,000grooves.
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Example Groove PlotsExample zoomed plot over about 35 feet.
Close-up zoomed plot of standard grooves.
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Comparison of ProGroove and Manual Groove
Calculation at ACY Runway 4ACY Grooves S to N
0
0.05
0.1
0.15
0.2
0.25
0.3
0.35
1 14 27 40 53 66 79 92 105 118 131 144 157 170 183
Groove Number
Groove
Depth,
in
Depth Gauge
SELCOM
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Current FAA Pavement Grooving
Requirements Instruments for measuring groove width
and depth must have a range of at least 0.5
inches and a resolution of at least 0.005inches. Gage blocks or gages machined to
standard grooves width, depth, and spacing
may be used. Instruments for measuring center-to-center
spacing must have a range of at least 3.0
inches and a resolution of at least 0.02inches.
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Current FAA Pavement Grooving
Requirements
The Engineer will measure grooves in five
zones across the pavement width.Measurements will be made at least THREE
times during each days production.Measurements in all zones will be made foreach cutting head on each piece ofgrooving equipment used for each daysproduction.
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Current FAA Pavement Grooving
Requirements The five zones are as follows:
Zone 1 Centerline to 5 feet left or right of the centerline. Zone 2 5 feet to 25 feet left of the centerline.
Zone 3 5 feet 25 feet right of the centerline. Zone 4 25 feet to edge of grooving left of the centerline. Zone 5 25 feet to edge of grooving right of the centerline.
Width or depth measurements less than 0.170 inches shall beconsidered less than 3/16 inches.
Width or depth measurements more than 0.330 inches shallbe considered more than 5/16 inches.
Width or depth measurements more than 0.235 inches shallbe considered more than 1/4 inches.
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Comparison of Previous and Current
Groove Standards
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Current Groove Measurement
Methodology
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Summary
The revision to FAA AC 150/5370-10E,Standards for Specifying Construction of
Airports, dated 9/30/2009 clarifies thefollowing grooving requirements:
- combined rigid and flexible in one section,
- established criteria for acceptance testingequipment and the procedure for groove
measurement in the field for acceptance,
- augmented existing PWL acceptancestandards for pavement grooving.
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Acknowledgements
Mr. Jeffrey Rapol, AAS-100
SRA International