The following discussion is from Listserv.repp.org Greenbuilding mailing list. I was wondering if anyone here has experimented with geopolymers (coined by Joseph Davidovits) or the broader alkali-activated cements ? I watched the video where Davidovits tried, and seemed to succeed, in reproducing how the Egyptians may have poured synthetic limestone using materials available to the Egyptians. === lime (hydrated) 8 parts sodium carbonate (washing soda) 6 parts kaolin clay 16 parts (...)

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