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Sonic pile testing is a cheap and very simple method to verify whether
or not a pile shaft presents deviations. By means of a sonic integrity
testing system the pile length can be verified and the quality of concrete
foundation piles can be tested. Any irregularities, cracks, fractures and
diameter changes in the pile shaft can be detected very quickly by
means of the sonic pile testing.
The sonic integrity test is a non-destructive test method.


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In order to perform a successfull sonic testing of concrete foundation
piles and to provide a reliable interpretation of the measurements, the
piles first need to be carefully excavated and meticulously cut off. All
loose debris and impurities must be removed. The pile concrete must
be at least one week old and the pile heads should not be submerged.
The piles must be accessible, in the absence of any reinforcement or
in-situ concrete.

 

Using a special plastic hammer you can hit the pile head, sending a
shock wave through the pile. This schock wave is reflected by the pile
tip or by discontinuities in the pile. The reflected signals are captured by
a sensitive accelerometer that is pressed against the pile head. These
signals provide important information on the pile shaft and any defects
that may exist.

 

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The pile reflections are shown on the display of the metering system,
thus directly giving an indication of the quality of the measurements.
The results are analysed at the office. When evaluating the results, the
various pile installation techniques and the geotechnical data such as
cone penetration tests and borings are taken into consideration. Pile
driving records and registration of the pile key characteristics may also
be very useful in the analysis of acoustic measurements.