#1  
Old 05-08-2014, 06:01 AM
Apprentice
 
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Location: France
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Default Most suitable grog granularity

Hi folks,

I have found grog with two different granularities - 0/3mm and 4/8mm

Given that I am going for a dome of around 8cm(3") thickness, which would be more suitable. Someone kindly suggested that I should shoot for an eighth of the total thickness which would point to the 4/8mm grade but is there a disadvantage or problem with going for finer than is required?
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Old 05-08-2014, 06:43 AM
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Default Re: Most suitable grog granularity

Both, actually. What you want is a a range from dust to the largest size required. 0/3 means dust to 3mm, 4/8 means 4mm to 8mm, so a blend would work well.

The idea of an concrete material is a thin matrix of cementious material surrounding graded aggregate. The aggregate is graded such that the interstitial spaces are as small as possible.
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Old 05-08-2014, 06:47 AM
Apprentice
 
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Default Re: Most suitable grog granularity

Thanks TS... and if I had to choose one or the other (not that I will have to, but if I did?)
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Old 05-08-2014, 06:53 AM
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Default Re: Most suitable grog granularity

The larger.
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Old 05-08-2014, 12:00 PM
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Default Re: Most suitable grog granularity

You really need 0 to 1 grade as fine as possible for a dome as the joint tamper from nothing to around 10 ml on outside of dome any granular larger than 3 ml and your brick would "rock" ie ground out on the gravel making for a nightmare to lay
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Old 05-08-2014, 12:02 PM
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Default Re: Most suitable grog granularity

Sorry not gravel but ground firebrick grog size
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Old 05-08-2014, 12:10 PM
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Default Re: Most suitable grog granularity

He is not laying brick, he is making refractory concrete, the fines are already covered in the other aggregates he is using.
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Old 05-08-2014, 01:10 PM
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Default Re: Most suitable grog granularity

And what about the sand? I've heard builder's sharp sand being mentioned. I'm not sure how I would identify that here in France - what distinguishes it? Can I use regular builder's sand? Is the granularity important?
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Old 05-08-2014, 01:20 PM
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Default Re: Most suitable grog granularity

Cleaned washed sand, it may be called concrete sand, torpedo sand, stucco sand, or sharp sand.
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Old 05-08-2014, 01:44 PM
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Default Re: Most suitable grog granularity

Thanks - appreciate all the help
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