california friction testing at mnroads (ca-342)
DESCRIPTION
California Friction Testing At MnROADs (CA-342). How Things Work November 12, 2008. CA342 Friction Testing. CA-342 Equipment Operation. Slide. Release. Distance Measuring Scale. Springs. Smooth Tire. Stand. 6 mm Offset Above Pavement. Shipping and Crating. - PowerPoint PPT PresentationTRANSCRIPT
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California Friction Testing At MnROADs (CA-342)
How Things WorkNovember 12, 2008
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CA342 Friction Testing
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CA-342 Equipment Operation
Smooth Tire
6 mm Offset Above Pavement
Distance Measuring Scale
Slide
Stand
Springs
Release
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Shipping and Crating
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Calibration of the Equipment
Glycerin Container
WD 40
Serrated Edge Calibration Plate
Mounting Plate
Environmental Trays
Power Cable
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MnROADs Test Locations
Seven Friction Tests Conducted at Each Location (0, 5, 15, 30, 45, 90, 0 degrees)Three Locations Tested within Each Cell
MnROADs Cells Tested
Cell 7 NGCSCell 8 CDGCell 9 NGCS LiteCell 10 RTTCell 13 Astro TurfCell 15 AC
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Operation of Test Device for Determining Effect of Test Angle on Friction Value
05 15 30 45
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Testing at 90 Degrees
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Placing Glycerin on Wheel and Pavement
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Friction as a Function of Test Angle
0.00
0.20
0.40
0.60
0.80
1.00
1.20
1.40
1.60
0 10 20 30 40 50 60 70 80 90
Fric
tio
n In
de
x R
ela
tiv
e t
o F
ricti
on
in D
ire
ctio
n o
f Tr
av
el
Deviaton from Direction of Travel (Degrees)
NGCS
CDG
NGCS Light
Random Transverse Tined
Asphalt Concrete
Astro Turf
Friction Index as a Function of Deviation from the Direction of Travel when Corrected For Cross Slope
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Questions?