Locating Delaminations and Other Defects in Concrete Silo Walls Using the Impact-Echo Procedure

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Title: Locating Delaminations and Other Defects in Concrete Silo Walls Using the Impact-Echo Procedure

Author(s): N. A. Cumming and 0. S. Ooi

Publication: Special Publication

Volume: 168

Issue:

Appears on pages(s): 185-198

Keywords: concretes; impact tests; nondestructive tests; repairs

Date: 4/1/1997

Abstract:
A major structural repair and strengthening program was undertaken at a large grain shipping terminal on Canada’s northwest coast. The work was required to correct problems of excessive cracking and internal delamination in the silo walls. During the repair work, it was necessary to survey 42 silos to locate zones of delaminated or deteriorated concrete. This was done successfully using the impact-echo procedure. This paper describes the impact-echo survey and its findings. It further discusses correlation of test results to actual conditions encountered in the field.