Aerated concrete, leveling the first row of stones

  • Erstellt am 2022-05-13 15:35:39

Peug408

2022-05-13 15:35:39
  • #1
Hi, I am currently building with aerated concrete blocks, and I have deviated a bit in height; I have now set 3 blocks slightly lower by about 3mm. I brought the 4th block back to the height of the rest of the blocks. Should I even out the 3mm from above with mortar, or is this possible with thin-bed mortar?
 

i_b_n_a_n

2022-05-13 18:56:01
  • #2
Are you seriously talking about a full 3mm here? The building will collapse later if it stays that crooked :p And now seriously: The average bricklayer is happy if he doesn’t cross the property boundaries. 3mm are more like steel construction tolerances
 

11ant

2022-05-13 19:16:03
  • #3
At first, I held back because I didn't feel specialized enough on this question to give you a practical answer from my toolbox. Now, after the reply however, I feel the need to assure you of my sympathy: yes, from my point of view, your question deserves to be asked (and answered) seriously. Because, in my opinion, you rightly suspect that 3mm more (so now four instead of just one) of bed joint could be an application area for a different "mortar." Executing 6 instead of 3 mm (as it would be in the comparable case with porous bricks) with the same bed joint mortar would be a different matter than in your case with aerated concrete 4 instead of 1 mm. And even with porous bricks, I believe they usually don't use the same mortar under the first layer as above. I'll call a practitioner into the discussion :)
 

11ant

2022-05-13 19:23:24
  • #4
P.S.: Is this perhaps about your construction site "in the south of Russia"? - in that case, other than the local temperature conditions, those must also be taken into account when determining what the respective building materials need to withstand ...
 

Peug408

2022-05-13 20:56:43
  • #5
Yes, it is about my house in the south of Russia which I am building on my own.

The temperature is already 16°C at 7 a.m., and from 2 p.m. it was 31°C here.
I fear it will get even warmer in the coming days; the mortar dries quickly.
But now I don’t know if it is due to the heat, the aerated concrete, or the mortar itself.

I just add more water, but still after 10 minutes it’s so dry that you can lower the stones by one centimeter with 20 strikes.

So far it’s going quite well, I have decided on the size 625x250x300.
The stones are called WKBlok from wkb-systems and that is supposed to be a German manufacturer.
I actually wanted Ytong, but they are only available in Moscow and driving 1300 km there is not worth it.

Now one more question: here the Russians lay reinforcing steel in the first rows up to the windows, and from after the windows the last rows up to the ring beam completely around.
For this, they mill along the stones and lay in two reinforcements each and mortar them.

In Germany, masonry connectors are used.

Does that make sense or is it nonsense?

The method with masonry connectors at the corners is certainly the simpler solution.

Below an example of that.

 

Nida35a

2022-05-13 21:07:59
  • #6
The Russians make a composite material out of the glued stones, which is probably better suited for the temperatures and stresses. I would rely on the Russian experience and have it done that way. It doesn't hurt, and frost and summer cause movement in the ground, for which the bars are also better.
 

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