Closing holes in aerated concrete blocks

[akist]

I have opened some "pigeon" holes into a number of blocks in order to put joists through, about 50 x 100 each. I then changed my mind about the joists (there is another thread) and made more holes higher up.

I would like to close up the extra holes (on the photo, the bottom row) and am considering the right material. I could use mortar, but mortar is very hard and the aerared blocks are much softer. I would like to match the filler material to the blocks as much as possible, so for example, if in the future someone drills into that area they will not notice too much of a difference.

Could you suggest a method (other than standard mortar) ?

 

[JohnD]

Could you suggest a method (other than standard mortar) ?

Can you ask a question that does not rule out the most sensible answer?

Because the blocks are very dry and absorbent, they will, unless properly wetted first, prevent mortar from curing properly and gaining strength.

 

[Mr Chibs]

Could you suggest a method (other than standard mortar) ?

Just mortar it... or cut some blocks down and mortar those in.

 

[^woody^]

Cut some of those blocks to size, with a saw.

 

[akist]

Can you ask a question that does not rule out the most sensible answer?

I was thinking as mortar tends to shrink and crack a lot, there are other fillers I could use, hardwall, repair mixes, adhesives, grouts, etc and wanted to see if anyone has experience with something that will work well with those "soft" blocks to close those large holes but also other cracks and bad joints here and there.

Because the blocks are very dry and absorbent, they will, unless properly wetted first, prevent mortar from curing properly and gaining strength.

Yes you are right. And to think the whole house was built like this. I do not even want to think how strong all the joints are. But, to be honest, I have not seen bricklayers wetting the blocks first on other sites.