Radar is being used to investigate,
image and define road pavement
In the USA and Europe its the standard.
GPR gives the
construction thickness of the pavement.
It can detect where construction changes
(use to target BH’s)
GPR can detect
Rebars
Use it to map changes with time (repeat
surveys)
It’s a quick way to assess bigger areas
Applications
Road QA QC
Airport pavements
Parking area
Asset / Infrastructure
Management
This is what a typical air launched Radar setup looks like
Compare GPR directly to AC Core
The radar data is collected by running the antenna
across the surface, the makes an image, the base of the pavement
shows up as the semi horizontal line at 19 nS (about 700mm)
depth
The image below shows the floor of a swimming pool. The client
was concerned that leaks in the pool floor could cause piping
erosion and ultimately failure of the pool base. This was an Olympic
size pool. The pool was drained down for remedial work and
(fortunately) we had a dry surface to work on. It would have been
very challenging if the pool was full as it was up to 3 m deep at
one end. The defects showing at the Right of the image are grout
paced as part of the remedial work. It was good we could report to
the client that there were not defects showing with radar that could
show there was piping under the pool
The image below is is a plan view version of the 3D image, the
grouted area shows at the right of the image. The cross pattern is
the jointing between the slabs the form the pool base.
Subsurface Imaging also apply other
techniques such as Resistivity Imaging, EM, Seismics, Magnetics for
Structure
investigations
