Thanks for checking this out @khufu great questions and suggestions! I have been using dawn dish soap, but just learned a better soap from @ambiguity may be Drexel and an additional additive called j-lube which is like KY jelly and helps to create a very consistent stable foam. Very cool Idea with the graphene, it may be possible to create sections of graphene by adding finely ground graphite in the mixture. Since graphene is just a single layer of graphite. I don't know if you would create a consistent lattice of graphene but their could be sections of it it the final cure of the concrete. Definitely would love to experiment with that Idea.

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