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Evaluation of the Concrete Columns
Office Building
 During
the renovation of a two-story building in San Francisco, some of the
concrete columns of the second floor exhibited honeycombing, rock
pockets, appearance of cold joints, crazing and horizontal cracks.
Concerns were raised regarding the internal quality of the concrete.
Concrete Science, Inc. used the impact-echo technique to evaluate
the internal condition of the concrete columns.
Impact-echo tests were conducted at one-foot intervals on the columns.
The test results showed a wide variation in the response spectra indicating
poor quality concrete. The test results located interior voids in
some columns.
Concrete Science, Inc. recommended additional testing and provided
guidance to the structural engineer in choosing the repair materials
and procedures. |
