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Drilled pier cracks

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Hi Rich,

About your testing related query, sonic echo (SE) or
Impulse Response(IR) are techniques that may be useful
to determine the integrity of rest of the drilled
pier.  In these methods a hammer strikes the upper
surface of the pier, and the time taken by the
resulting waves to travel from the impacted location
to the receiver after getting reflected either from
bottom of the pier (in case no defect is present) or
from the defect is measured; or a spectral analysis is
conducted to determine the location of defect, if any.
 Since the upper surface is cracked, sides may also be
used for testing purposes, if top 1-2 ft can somehow
be exposed.


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