Global Technology Ltd.
Ground Penetrating Radar (GPR) is a cost effective tool for characterising the subsurface properties of e.g. highways and
Rapid data acquisition accompanied by little or no interference with other traffic reduces costly closures and can provide a continuous cross section of the pavement under investigation, regardless of length, composition, temperature and condition.
The GPR technology combined with FWD provides a strong tool for pavement investigation.
The Falling Weight Deflectometer (FWD) generates a load pulse by dropping a weight onto a damped spring system mounted onto a circular loading plate.
The spring, smoothes the load of the falling weight to produce an almost sinusoidal pulse.
The load pulse has a similar shape to that generated by a moving vehicle. The resultant deflection bowl of the pavement is accurately determined from measurement of peak deflections at the centre of the loading plate and at several radial positions by a series of geophones.
The actual load applied to the pavement is partially dependent on the FWD-pavement interaction and is therefore measured by a load cell.
This technology is used most pavement investigations.
Pavement Conditions Survey identifying good, fair and poor pavements (visual).
Consistent and reliable survey results are important in order to decrease subjectivity and variability in the identification of distresses typically found within flexible and rigid pavements. They also provide a method of recording these observations in a consistent manner.
The designer/planner is interested in the type, extent, and severity of visible distress or corrective action taken on previous distress (such as number of patches or length of sealed cracks). Depending upon the type of distress. Occurrences are recorded in terms of percentage area or areas.
Coring is a useful tool for investigating structural condition in pavements. As well as providing important information about layer thickness, necessary for the correct interpretation of other surveys, cores provide an opportunity to examine the visual condition of the various materials within the pavement.
In order to reduce the number of cores, as they are costly and often difficult and dangerous to undertake, GPR should be considered for each project as a tool to identify appropriate core locations.
As coring can be costly and dangerous to undertake, a preliminary GPR survey should be considered for each project as a tool for identifying appropriate locations thus limiting core numbers, lane closures and limiting risk to the coring team.
Atlas Global Technology Ltd.
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NG24 1TW Newark United Kingdom
Phone: +44 7912 1711 92
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