Cement instead of anchor compound?

[AKEAL]

I am going to build piers that will be anchored to the rock. I have drilled 25 mm holes (the smallest drill available for the drill machine used) and will fix 16 mm rebar (the largest rebar I found in the hardware store for private individuals). The holes are 15-25 cm deep. The piers will support an Atterfall house, with 251 mm form tubes and the rebar cast into concrete in the tubes. Can I use regular cement to fix the rebar in the hole or do I need to use anchoring compound to get good fixation?
There are up to 30 holes (2-3 holes/pillar), so using anchoring compound becomes very expensive, hence the question if regular cement can be used instead.

 

[kniv]

Yes, it's sometimes called "slurring." Just cement and water mixed into a cement paste. It works well as a substitute for anchoring mass.

 

[Boxer63]

Feel free to use expander concrete, for example this one:
https://www.finja.se/produkter/gjuta-mura-putsa-laga/expanderbetong-fin?id=5511505
You shouldn't need much more than one bag, and then the reinforcement will sit properly.

 

[a_w]

I would not use regular concrete. Highly uncertain if you will get the concrete to flow down into the holes. Then I think anchoring compound is much harder than regular concrete.

 

[jonaserik]

I am going to build piers that will be anchored into the rock. I have drilled 25 mm holes (smallest drill bit available for the drill) and am going to secure 16 mm reinforcement bars (largest rebar I found available to private individuals in hardware stores). The holes are 15-25 cm deep. An Attefall house will stand on the piers, which are 251mm pouring pipes formed and the rebar are embedded in concrete in the pipes. Can I use regular cement to secure the rebar in the hole or must anchor compound be used for good fixation?
There are up to 30 holes, (2-3 holes/pier) so using anchor compound would be very expensive, hence the inquiry if regular cement can be used instead.

If you can get the rods down to the bottom of the hole, you can use a slurry, (pour it in and tap on the rod) the rods are only to prevent a pier from moving laterally, so 16 mm rod is sufficient, even 12 is enough if there are 3 that go up to about 5 cm from the top of the pier. A tip is to align the forms with the rods in place and pour about 5-10 cm of concrete at the bottom, sway a bit on the form, so it swells out. The rock is certainly not in the right direction but a bit at an angle. Wait until the next day, then it's perfectly fine to fill the form without it collapsing in any direction. Remember when pouring concrete, to pour about 5-10 cm and move a rod/stick so that the water comes up. It is important to remove the air from the concrete. You can also tap the form with a hammer, but not too hard. You can also use a percussion drill with a large bolt in the chuck, but then you have to be a little more careful so the form doesn't release.

 

[AKEAL]

Thank you very much for the advice. I decided to use ankarmassa anyway. I was advised that Biltema's ankarmassa is at least as good as "more expensive" brands, and it didn't require as much as I thought. I learned that expanding concrete needs at least 30 mm of free space to expand according to the manufacturer. It would have been a good alternative if I had drilled larger holes from the start.