Holdfast Training Services Trial Blog

Hello all,

Just a quick one to spark some debate and follows on from Ed’s the other day. I have been involved with the vertical elements of my project site which include columns and outrigger core walls. The pours have been going well but on opening the forms up today a number of elements have had issues. Multiplex have referred these issues to the consulting engineers and are waiting on their response for the required remedial action or acceptance as they see fit. Some of the elements where poured on different days using a mixture of kibbling and pumping. All are 80mpa which generally is being reached well before the 28 day mark with the columns feelably hot. The mix is designed to be self compacting with no requirement for vibration but the supplier has been having issues with producing consistently accurate mixes. These elements are on level 7 of 82.

Column 1 – Evidence of very small honeycombing and cold pour joints

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I would suggest that no rectification is required for this column. Your thoughts?

Column 6 – Evidence of small honeycombing and cold pour joints

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Again I would suggest that no rectification is required for this column. Your thoughts?

Column 7 – Evidence of cold pour joints and large scale honeycombing which is exposing reinforcement.

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My feeling on this one is that rectification will be required. I think that as a minimum they will ask for the concrete to patched to cover over the steel work but that more extreme remediation could well be asked for.

Column 10 & Outrigger Core Wall 8 – Evidence of small honeycombing and cold pour joints isolated to a single batch of concrete. This was kibbled and you can clearly see the flow of concrete away from the column, which was the insertion point, into the rest of the wall.

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As before I would suggest that no rectification is required for this column. Your thoughts?

Multiplex should be getting the consultants response shortly so I will update the post with this detail once received and you will be able to compare your thoughts to that of what actually happened.