I want to fill rectangular hollow steel beam with concrete. The problem is that length of the beam is 3m. Can you give me some suggestions on how to fill it vertically? As throwing concrete from such a height will cause segregation.
Dear Arbab
Above method Given by Arturo is good as for Design mix, concrete quality point of view, for construction point of view You can make open able window in your hollow steel beam for pouring concrete. In this method if possible then first cast concrete starter 4" (100mm) of same size of column and then as per attach drawing you can fix your Hollow steel beam.
If beam size is small and make a window is not feasible then you can use funnel and tremmie for concreting.
You can do concreting in 2 parts also. First you take formwork and make column of 1-1.5 mtr and after 2-3 days you insert steel hollow tube in to this and then pour another lift.
By this method you can get good concrete, without bleeding, segregation problem.
If any doubt let me know
Thanks & Regards
Thanks for the suggestions.
Arturo E Schultz , why is it necessary to have greater slump in this case?
Dharmesh K. Oza the opening is not possible in this case. For the 2nd, will it effect the bond between steel tube and concrete? If yes, how will I deal with it?
Dear Arbab: The slump is needed for proper consolidation in long pours, especially if there are any obstructions such as reinforcing bars, headed studs or other embedded items. If you have a clear path without such obstructions you could try a lower slump. However, you need to consider proper consolidation and setup time. You need to be able to vibrate or otherwise consolidate the wet concrete in place, and you need enough time to do that over a long pour. The water reducer and superplasticizer give you the necessary workability, and a retarder can be used to increase set time. Whichever route you choose, I strongly recommend making a series of trial batches for which you measure slump, setup time, segregation, 7-day strength and modulus, and any other properties of interest. I hope this information helps you.
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