Filling concrete hollow blocks

[Magnus Hedin]

I am going to build a basement wall with concrete hollow blocks. When building, should you fill the holes in the blocks with concrete as well?

 

[imported_Byggaren]

No. When you are laying bricks, you should turn the stone so the holes face downward. 'Holes' are the only insulation btg.hålsten has, as air is a poor conductor of heat.

In earlier times, btg.hålsten was used for almost all foundational constructions because there was no other alternative. Today, they are replaced with lightweight expanded clay aggregate concrete which has a higher insulation value. So if you need it heated on the other side, you should not use btg.hålsten, but rather Leca. You can also use lättbtg.
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Byggaren

 

[Magnus Hedin]

Okay, thanks for the answer. Are the lecablock as strong (can withstand as much pressure) as concrete hollow blocks?

I got the concrete hollow blocks cheaply and will insulate with podrän on the outside, so I will build with what I have for as long as it lasts. Then I'll buy leca for the rest of the wall.

 

[anaitis]

No, there is a difference in strength, btg.hålsten is stronger than lecablock.
But lecablock are strong enough!!

 

[Moltas]

Concrete block vs. Leca: how big is the difference in strength? Preferably in numbers..

 

[anaitis]

The strength of Lecablocks is in the range of 3 - 5 MPa. Solid concrete can relatively easily reach 30 - 40 MPa, but that doesn't say much about how strong the hollow blocks are. I don't recall any data on this, but they are stronger than Leca anyway.

 

[Moltas]

Oops, what a difference. Anyone else have information on the hålstenen?

The story is that my carpenter, who is going to make a punschveranda, is worried the corners will have too high point loads. Therefore, he wanted me to cast pillars and then make walls in any stone. I find this to be a less favorable and cumbersome solution. That's why I am looking for alternatives...

 

[anaitis]

In that case, I would suggest you build with leca, but where your high point loads come down, you cast a distributing slab of reinforced concrete (btg) on top of the leca.
For example, 30-40 cm long.

 

[stomneby]

if it doesn't need to be insulated, then maybe fundablock is something to consider
http://www.betonggjuteriet.se/CM.php?PageID=76460

 

[Moltas]

Have found that concrete block withstands 5MPa and the stronger lecan withstands the same. If I'm not calculating too wrong, it should mean that they withstand about 5kkg/cm^2. Am I calculating correctly? I'm thinking that one probably never needs to worry about their strength if so...

 

[anaitis]

I've found that concrete holding stones can withstand 5MPa and the stronger leca can withstand the same. If I'm not counting too wrong, that should mean they can withstand about 5kkg/cm^2. Am I calculating correctly? I'm thinking you probably never need to worry about their strength if so...

Sorry, that was a bit wrong....
1 MPa ~= 10 kP/cm2

 

[Moltas]

Thank you, I was thinking a bit quickly there and the decimal went the wrong way. In summary, I end up with the conclusion that two tons should be able to land on about 40 cm^2.

 

[BörjeHansson]

I will be building a basement wall with concrete hollow blocks. When building, should the holes in the blocks be filled with concrete as well?

Turn the blocks so the holes are for insulation.