Hi
I plan to use sand - we really have nothing on site, there isnt the space to harvest anything here. How much sand would be needed to stop the deformation that's usual with building blocks though, I fear it might need a lot of sand. If everything shrank uniformly without deformation I'd be happy, but I've not seen an example of that happen yet.
When I've got the new moulds done I hope to try an assortment of new mixes, see if I can get somewhere. One approach I'm hoping to try is to use a watertight mould so no drainage occurs until the cement's set.
Thanks, NT
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