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406 High strength concrete incident
Report ID: 406
Published: Newsletter No 34 - April 2014
Report Overview
This relates to a project where the concrete in the walls was C40, and in the in-line columns was C60. The walls were in the same width as the columns so difficult to distinguish which was which from the top of the shutter.
Report Content
This relates to a project where the concrete in the walls was C40, and in the in-line columns was C60. The walls were in the same width as the columns so difficult to distinguish which was which from the top of the shutter. The contractor put concrete of the right mix in the wrong hole in the shutter. An easy mistake to make says the reporter but the designer could have thought about it.
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Again is the designer sure that what he thought was being built was actually built? One grade of concrete cannot be distinguished from another just by looking at it. Different strengths of concrete in the same part of a structure can lead to problems if mistakes are made so in such cases there should be clear identification of the sequence of operations.