I have a number of 12" square concrete piers reinforced with 10 * 16mm rebars. The rebar extends to around 4m tall, while the concrete has been poured to a height of 3.3 metres.
This an error because the intended height of the bottom of the upper floor is 3.3 metres; however, as a 40cm concrete beam is planned to support the upper floor, this means that the height of the poured concrete should only be 2.9m, to allow for a 40cm beam on top.
So I am considering chiselling 40cm of concrete off the top of the pier and placing the rebar there. Does that pose structural concerns for the strength of the pier?