Cement

[genes]

Hello!

I'm planning to build a garage with Leca blocks 19x19x59 and I'm wondering what the difference is in the cement. I'm looking at the Byggmax website. They have a model called Murcement A 63 SEK/bag and then they have standard Cement at 40 SEK/bag.

Does anyone know the difference?

 

[gb79]

You definitely should not use regular cement to mortar with leca as it is not intended for that, it should be mortaring cement instead. However, you can compare different brands. I myself mortared the house with ready-mixed mortaring and rendering mortar if I remember correctly, B mortar I believe.

 

[Ricky_SE]

Masonry cement A gives a "stronger" mortar than masonry cement B.... Cement "standard" is to be mixed with gravel...
A= cement/sand 1/3
B= cement/sand 1/5

R.

 

[Mikael_L]

Of course, you build lightweight concrete with B-mortar and if you then want to plaster, you use C-mortar, because you should apply weaker mortar on stronger ...?

 

[genes]

So, murcement A does not need to be mixed with gravel, which you are supposed to do with standard cement?

 

[gb79]

I'm weighing in again even though I don't really know this

I don't think you should use a bruk but it's optimal to go with a pre-mixed mortar b, excuse me if I'm wrong.

I think I had utstockningsbruk b then as plaster on the house and so far it looks great anyway
regards

 

[malmborg]

Used a sack of regular cement and a shovel of murcement/gullex and 13 shovels of mursand, if I remember correctly.
-can't imagine it's cheaper to buy pre-mixed bags?
-go to the gravel pit and grab a trailer (take a big one, often the same price around 100-150kr) and get mursand, I know...
good luck!

 

[Mikael_L]

Built with a bag of regular cement and a shovel of masonry cement/gullex and 13 shovels of masonry sand, if I remember correctly
-can't imagine it's cheaper to buy pre-mixed in a bag?
-go to the gravel hole and get a trailer load (take a large one, often the same price around 100-150kr) and get masonry sand I know....
good luck!

Pre-mixed mortar is definitely not cheaper than mixing cement and masonry sand yourself.

But despite this, there is hardly any economy in taking a trip to get sand if it's just a single bag of mortar you need.

The original poster is going to build an entire garage, so it might be justified. At the same time, you need to have the confidence that you can mix well enough yourself .

 

[genes]

Thanks for the answers. Buying regular standard cement and picking up gravel on a trailer. Mixing 1/3 should make it great.

 

[grävaren]

You probably need murcement/Gullex instead of standard cement. It contains lime and is used for masonry.

 

[Mikael_L]

Mja...
I think you are describing an A-mortar now. With that mixture .... but I'm not sure...
You should probably use a weaker B-mortar with LECA ... I think ....

Read page 3 in this work instruction from Maxit
http://se.maxit-cms.com/media/22/pdf/leca/vaggar/murverk_arbetsanv.pdf

I am not an expert on this, but I advise you to be completely sure before you proceed and start building.
You should be able to call Maxit, you might get proper advice there, and even at the building merchant they might know. But be careful with the latter, especially at so-called building supply stores, where the level of knowledge is often alarmingly low, although they often try to appear knowledgeable.

 

[gb79]

Thanks for the answers. I'll buy regular standard cement and get gravel by trailer. Mixing 1/3 should be great.

do not do that I say,
am I so wrong when I say that standard cement is concrete??
you should not use concrete for masonry but gullex, masonry cement!

b use should it also be as one could read in the maxit link above

 

[anaitis]

don't do that I say, am I so wrong when I say that standard cement is concrete?? you shouldn't build with concrete but with gullex, murcement! b mix it should also be according to the maxit link above

Cement is one of the components in concrete. The same goes for most mortar and plaster, cement is included but there is more, much more. Simply put, cement is the glue in the materials above.

 

[gb79]

Cement is one of the components in concrete. The same goes for most mortar and plaster, cement is included but there's more, much more. Simply put, the cement is the glue in the materials above.

yes but isn't it wrong if he takes standard cement and mixes it with sand and is supposed to mortar??? that's how you make concrete, possibly with aggregate too. is he going to mortar with concrete?

no I still insist that he shouldn't mortar with concrete!

and he shouldn't mix it with gravel either, or do we call mortar sand gravel?

best regards

 

[ktm250]

Cement and masonry cement are binders and should both be mixed with something depending on what you want to do.

To mortar lightweight concrete blocks, you should use a B-mortar. If you want to use standard cement, you also buy Slaked lime E and mix in weight proportions of 35/65/550 Lime/Cement/Sand. (1:1:8 volume) Then you have a KC-B. If you use masonry cement, you mix with sand in weight proportions of 100/600 Masonry Cement/Sand (1:5 in volume). Masonry Cement A and sand become a Gullex in different strengths depending on how you mix. Gullex does not contain added technical lime, which makes it really good for masonry, but not as good for plastering as it is stiffer.

For example, if you are building below ground level, you don't want the lime in the mortar and then you use Gullex in the right strength. The right strength for lightweight concrete blocks is B. It is best to buy ready-mixed factory mortar. That way you really know what you are getting. What you are looking for then is Gullex M 2.5.

When you then plaster, you prime with an A-mortar, apply mesh and plaster with B-mortar in 2 layers to a thickness of at least 15 mm.