khinz...you cannot adequately determine the integrity of concrete by how much "honeycomb" you can remove with a hammer. What several of us have been diligently trying to tell you is that when you have such poor placement of concrete, there are likely other quality problems as well, including the concrete mix.
In your photo, you appear to have elongated coarse aggregate particles with preferential, stratified alignment. Further, these stratifications appear to have little paste between them, indicating accumulated, segregated aggregate. This is different than "honeycomb" which is evidenced by sparse coarse aggregate and little paste.
khinz said:
The concrete supplier explained that when the concrete is poured from the concrete truck, it hits one side so the aggregates go to the outside part and the vibrator missed the outside part.
You stated that the concrete was pumped. The concrete in the column has little to do with how it came out of the truck, since it was pumped from there. It is likely the segregation occurred from dropping the concrete a long distance, as you can see that consolidation was better as you when up the column. Further, you stated that vibration was done from the top. This would not allow full vibration of the concrete to the bottom of the column. Each of these is a bad practice in itself.
If you review the ready mix delivery tickets, you might find that the concrete was relatively old when placed and was losing slump. Further, there's a chance that the aggregates were not in a saturated surface dry (SSD) condition with the concrete was batched, thus caused water loss by aggregate absorption.
You further indicated that the drum of the truck was rotating when delivered....well of course it was. It should have been. Your comments suggest that you know little about concrete technology and yet you are being placed in a position of accepting conditions about which you know little and have not determined some critical aspects of the concrete as it exists in place, particularly interior to the column (strength, voids, segregation, etc.). I suggest that if you have any authority whatsoever that matches the responsibility you seem to have been give, you should exercise it and get the bad concrete out of the column.
Concrete is not nearly as simple as it appears. It takes concerted effort by multiple parties to get concrete design, batching, mixing, placement and curing done correctly. Much of the time that seems to happen without such effort; however, that is with experienced actions all around.
Good luck.