California Friction Testing At MnROADs (CA-342)
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Transcript of California Friction Testing At MnROADs (CA-342)
California Friction Testing At MnROADs (CA-342)
How Things WorkNovember 12, 2008
CA342 Friction Testing
CA-342 Equipment Operation
Smooth Tire
6 mm Offset Above Pavement
Distance Measuring Scale
Slide
Stand
Springs
Release
Shipping and Crating
Calibration of the Equipment
Glycerin Container
WD 40
Serrated Edge Calibration Plate
Mounting Plate
Environmental Trays
Power Cable
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
Operation of Test Device for Determining Effect of Test Angle on Friction Value
05 15 30 45
Testing at 90 Degrees
Placing Glycerin on Wheel and Pavement
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
Questions?