The way I completely eliminated shrinking was to fill the mould, then insert a plug, and stand on it until it was pressed down level with the mould's edges. Such compressed blocks can be demoulded immediately and dont shrink. The only issue is that a large block like yours would take numerous people to press it down. I did this with medium and high cement mixes btw, I expect it would work with less cement too, since the cement has no control over dimensions until it begins to set.
More cement does mean a bit less trapped air, and a bit less insulation, but also less spread of fire and more strength.
NT
--- In papercreters@yahoogroups.com, "trendawareness" <trendlinesystems@...> wrote:
>
>
> Thanks for the suggestion. I don't want them to be too heavy as their primary purpose is insulation. My understanding is the harder the mix, the less insulative qualities it has.
>
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