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The site is in Russia :). I ve tought about the precast column but considering the transport expenses it is expensive. Of course we may do it on the site, but the workmanship must be perfect and the joint detail is interesting as you say.

Yes firerating, but mainly economy. As far as I know concrete is more economical then steel columns. And for 15 meters you just cant solve it with a profile section I suppose.

Thank you fof quick reply, Dimensions are 50 cm to 50 cm. We use plywood as form material.

Hello,we are constructing a warehouse with cocncrete columns and metal structure roof. my question is: Can we pour concrete into 15 meters long concrete column forms at once (pouring at 4-5 meter intervals trough windows on the column form). Or should we pour the first half first, then after...