Pozzolan GGBS

joemarsh20

New Member
Good Evening,

Could someone enlighten me, what is Pozzolan GGBS and should it be used or not used in Lime Plaster?

I am getting confusing information.

Thanks so much, Joe
 

joemarsh20

New Member
Oh dear I was worried you would say that it’s been used internally. What are the problems caused using it? If any?
 

The Hobo

Well-Known Member
Oh dear I was worried you would say that it’s been used internally. What are the problems caused using it? If any?
the only prob would show within a couple of weeks cracks etc if u not got them now don't worry lime is a bit of a nightmare but if it goes w rong just use filler hot lime is something else
 

joemarsh20

New Member
Yeh it’s just gone on and showing cracks but was told to flat them back with a float as they appear and as it dries. I read Pozzolan GGBS is cement based and would completely ruin the breathability of the lime? Is that correct?
 

The Hobo

Well-Known Member
Yeh it’s just gone on and showing cracks but was told to flat them back with a float as they appear and as it dries. I read Pozzolan GGBS is cement based and would completely ruin the breathability of the lime? Is that correct?
don't recognise it but keep away from cement based stuff however is giving your info is bang on
 

joemarsh20

New Member
I have tried to avoid cement based stuff completely and it’s taken some doing. Although this GGBS stuff is a curve ball. I just hope it’s not f***ed my lime plaster up the way I didn’t want it too.
 

The Hobo

Well-Known Member
I have tried to avoid cement based stuff completely and it’s taken some doing. Although this GGBS stuff is a curve ball. I just hope it’s not f***ed my lime plaster up the way I didn’t want it too.
no as I say don't now the stuff but cement would stop breathability
 

vfr12

MOTORC*NT
The two words do not belong together technically.GGBS is not pozzolan ,it’s hydraulic material with cementitious content . Pozzolan contains silica and alumina .
 

vfr12

MOTORC*NT
And yes , you f**k*d up the lime.The only benefit using ground granulated blast furnice slag is the low reaction with salts.
 

joemarsh20

New Member
The two words do not belong together technically.GGBS is not pozzolan ,it’s hydraulic material with cementitious content . Pozzolan contains silica and alumina .
Yup that what I worked out, two separate products, so.... what is this stuff?


That’s what got mixed with it.
 

vfr12

MOTORC*NT
Yup that what I worked out, two separate products, so.... what is this stuff?


That’s what got mixed with it.
The s**t you fcked up your lime with ! As I said , you need alumina and silica for hydraulic set, not iron and other s**t that left in the ash .
 

joemarsh20

New Member
I did that, said it was similar to a fly ash and that it added to the hydraulicness of the lime. It contains copper and magnesium I think he said.
 

vfr12

MOTORC*NT
I did that, said it was similar to a fly ash and that it added to the hydraulicness of the lime. It contains copper and magnesium I think he said.
Did he not told you what it does to the porosity and breathabilty of the lime ?
 

joemarsh20

New Member
I didn’t do it, I bought the material from a company, and they had plasterers who did the job. But they used 0.4m3 of a lightweight insulating lime plaster, and they look like they’ve used a third of a 25kg bag of pozzolan. I think they were putting a couple of cup fulls in each mix.
 
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