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| Titel |
Investigation of mechanical properties of pavement through electromagnetic techniques |
| VerfasserIn |
Andrea Benedetto, Fabio Tosti, Fabrizio D'Amico |
| Konferenz |
EGU General Assembly 2014
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 16 (2014) |
| Datensatznummer |
250097618
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| Publikation (Nr.) |
 EGU/EGU2014-13218.pdf |
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| Zusammenfassung |
| Ground-penetrating radar (GPR) is considered as one of the most flexible geophysical
tools that can be effectively and efficiently used in many different applications. In
the field of pavement engineering, GPR can cover a wide range of uses, spanning
from physical to geometrical inspections of pavements. Traditionally, such inferred
information are integrated with mechanical measurements from other traditional (e.g.
plate bearing test) or non-destructive (e.g. falling weight deflectometer) techniques,
thereby resulting, respectively, in time-consuming and low-significant measurements,
or in a high use of technological resources. In this regard, the new challenge of
retrieving mechanical properties of road pavements and materials from electromagnetic
measurements could represent a further step towards a greater saving of economic
resources.
As far as concerns unpaved and bound layers it is well-known that strength and
deformation properties are mostly affected, respectively, by inter-particle friction and
cohesion of soil particles and aggregates, and by bitumen adhesion, whose variability is
expressed by the Young modulus of elasticity. In that respect, by assuming a relationship
between electromagnetic response (e.g. signal amplitudes) and bulk density of materials, a
reasonable correlation between mechanical and electric properties of substructure is therefore
expected.
In such framework, a pulse GPR system with ground-coupled antennae, 600 MHz and
1600 MHz centre frequencies was used over a 4-mx30-m test site composed by a flexible
pavement structure. The horizontal sampling resolution amounted to 2.4x10-2 m. A square
regular grid mesh of 836 nodes with a 0.40-m spacing between the GPR acquisition tracks
was surveyed.
Accordingly, a light falling weight deflectometer (LFWD) was used for measuring the
elastic modulus of pavement at each node. The setup of such instrument consisted of a 10-kg
falling mass and a 100-mm loading plate so that the influence domain of the elasticity
measure could be comparable to that of the radar signal. Good agreement were found
between high Young modulus values and repaved zones, whereas damaged areas were
characterized by lower values of E.
Tomographic maps of amplitudes along the z axis were extracted up to a depth of z |
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