Combining non-shrink grout & concrete in column joint & beam

[planc]

There is a column with baseplate on top. We need to chip off half of it to put a concrete beam. We don't want to use steel I-beam. But you can't use ordinary concrete in the joint because it can't go under the baseplate with many rebars in the column. If we would place a non-shrink grout like Sika into the joint, can one mix it with ordinary concrete outside the joint (or rest of beam)?

 

[EcoGen]

Can you provide a sketch of it? It's not clear to me what the issue is based on your description.

EcoGen Consultants LLC
Structural Engineers
ecogenconsultants.com

 

[le99]

Your problem isn't the concrete, which can be terminated at a distance below the baseplate, the gap then is grouted after the concrete has set, and cured to the design strength. Your biggest challenge is how to develop the beam rebars to make this an integral beam-column joint.

 

[planc]

There is no problem about developing the beam rebars as you just put the required and computed beam reinforcement in the joint.

Here is the scenario. Pls see attached picture of the actual joint. On top of it on the left is the steel I-beam of the galvanized thin roof rafter and on the right is the I-beam of the wall, but the wall was not yet put. We discovered the baseplate has insufficient anchors to the concrete column. So we will cut the right wall I-beam and put a concrete beam instead to support the wall. We need to chip off the top just beneath the baseplate with concrete beam size half the width of the column and about 15.7 inches beam deep.

If we would just put normal concrete in the joint (3/4" aggregate is the standard). I just don't want any honeycombing to occur. What do you guys do if given the task of inserting a concrete beam under baseplate of the column? We can't remove the baseplate and would just shore up the thin roof rafter. What mix of concrete would you use?