Road surface deflection
is a parameter of pavement structural response and is used to indicate
the remaining structural life applicable to the test point.
Road surface deflection
at the test point is measured by the Road Surface Deflectometer (RSD)
beam to ascertain deflection.
The load used for testing is the standard 18kips (80kN) axle (9kips (40
kN) dual wheel) and the test is performed at creep speed.
The encoder reads the distance travelled by the
wheel in relation to the test point.
Deflections can be measured to an accuracy of +/-10 microns (0.4mm).
Since the data collection is automated, the
RSD can be used to obtain the entire surface deflection basin (256 data
points per basin).
The RSD can be used in conjunction with a
site data acquisition system or through portable interface capable of
running off his own battery power or 12V cigarette lighter option.
Data is stored on the coupled laptop computer.
Dimensions of suitcase: 120x20x8in
(305x50x20 cm)
Approx mass: 23lb (10.6 kg)