JT101 Posted December 6, 2016 Report Share Posted December 6, 2016 I have seen numerous references to adding grog to clay e.g. 20% - 40% grog. But is it by weight or by volume normally? There seems to be no explanation. Link to comment Share on other sites More sharing options...
Sputty Posted December 6, 2016 Report Share Posted December 6, 2016 . Link to comment Share on other sites More sharing options...
MatthewV Posted December 6, 2016 Report Share Posted December 6, 2016 Percentages should refer to dry weights. They are frequently guessed in practice. Link to comment Share on other sites More sharing options...
Marcia Selsor Posted December 6, 2016 Report Share Posted December 6, 2016 Dry weight for a clay batch. However, once you have it down, my recipe for a ^6 stoneware was in buckets going into a soldier mixer... 3 buckets, 6 buckets (quart size buckets.) marcia Link to comment Share on other sites More sharing options...
JT101 Posted December 7, 2016 Author Report Share Posted December 7, 2016 Many thanks. Spoken to a couple of other people and it seems this is the general consensus I'll quickly explain what I'm doing. I'm making insulative fire bricks, with a mixture of say 2 parts clay to 1 part sawdust by weight. I believe this works out around 1 : 6 by volume ( clay : sawdust). I'm doing several test pieces to determine what is the best ratio of organic matter to clay to build a stove body. As such I will do some pieces with grog. If I can determine the amount of shrinkage, then I will just build my bricks bigger to begin with, so grog is only really there to avoid cracks. Cracks in my stove wouldn't be good. I only really want to start with two percentages of grog at both ends of the spectrum to give me an idea of where I should go next. So 0% is the first, and the other I was thinking 40% by weight. So that would be 4 parts grog, 4 parts sawdust, 2 parts clay be weight. Not sure if this is a bit extreme. After all, I'm really after the lightest brick for the highest strength. If I put too much grog in there, it will lose it's insulative properties. Anyway, just wanted to get others thoughts Cheers Link to comment Share on other sites More sharing options...
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