The equipment include Ground Penetrating Radar (GPR), Light Weight Deflectomete (LWD), Falling Weight Deflectometer
(FWD), Automated Road Analyser (ARAN), and other advanced laboratory equipment for asphalt mix design.
Micro-Epsilon supplies a deflectometer
for inspecting shiny surfaces, while Irish startup, Viztronics, has also built systems based on deflectometry that are being trialled for glass inspection
These will include Defloctograph and Falling Weight Deflectometer
surveys and Traffic Count surveys consisting of video camera counts and rubber tube detector counts being carried out on public highway.
The measurement of pavement stiffness in the literature varies from Benkelman beam tests (Jamieson and Cenek 1999) to Falling Weight Deflectometer
(FWD) tests (Schmidt, Ullidtz, and Jensen 2009).
At present, there are many kinds of nondestructive testing (NDT) technologies of subgrade defect, for example, ground-penetrating radar (GPR), hammer sounding, acoustic tomography, falling weight deflectometer
(FWD), and time-domain reflectometry (TDR) .
Alessandro, "Preliminary in-situ evaluation of an innovative, semi-flexible pavement wearing course mixture using fast falling weight deflectometer
," Materials, vol.
Nazarian, "Simulation of light weight deflectometer
measurements considering nonlinear behavior of geomaterials," Transportation Research Record: Journal of the Transportation Research Board, vol.
Before zeroing the deflectometer
, each species was loaded with approximately 1,030 N to ensure proper placement and seating of the load heads.
To verify the anti-impact ability of this test site, the distribution of the dynamic deformation modulus [E.sub.vd] along the longitudinal direction of embankment top surface was measured with a portable falling weight deflectometer
, and the results are shown in Figure 3.
The resilient modulus values were defined based on back-analysis of data collected by a falling weight deflectometer
(FWD) offered by Dnit, from surveys conducted in five federal highways (BR 158, BR 285, BR 287, BR 290 and BR 392).
Stiffness measurements of the compacted base and subbase aggregates can be accomplished using a lightweight deflectometer
used according to ASTM E2835 Standard Test Method for Measuring Deflections Using a Portable Impulse Plate Load Test Device.