[Greenbuilding] geopolymer or alkali activated cements

[Ocean Swells]

a little follow up: i just discovered that there is a large volcanic
ash deposit on the big island.  i don't know if it is pozzolonic, but,
this could be a significant ingredient for a low temperature cement.

> ===
> lime (hydrated) 8 parts
> sodium carbonate (washing soda) 6 parts
> kaolin clay 16 parts
> water
> mixed in aggregate: 450 parts loose limestone (sans clay)  (???calcium
> carbonate???)
> ===
>

> Here are what I see as local materials:
> "Red Dirt" - oxisols - iron oxide, aluminum oxide, kaolin clay (comes
> from neighbor islands)
> "Lava Rock" - basalt - i don't mind using processed into basalt sand.
> (this is the most local)
> "Ocean Sand" - *not* silicate, i think ocean sand is a calcium
> carbonate, from coral, ???like limestone???  (hard to get on big
> island but on ocean floor)
>
> i was thinking that the following might be a start:
>
> lime, washing soda, red dirt, aggregate: either ocean sand, basalt
> sand, or both, plus larger basalt aggregates.
>