[Greenbuilding] geopolymer or alkali activated cements

[Gennaro Brooks-Church]

Ocean,
I don't have anything to add in terms of a cement alternative except
that I am very interested in hearing what you find. I have known about
the French organization for a while. I contacted them but didn't get
much info out of them. Rammed earth and the like is great but it lacks
the chemical reaction that really makes a substance strong. I would
love to get info on how to make an alternative to concrete.

Gennaro Brooks-Church

Cell: 1 347 244 3016 USA
www.EcoBrooklyn.com
22 2nd St; Brooklyn, NY 11231




On Sat, Apr 16, 2011 at 5:47 PM, Ocean Swells <swell at labranch.com> wrote:
> 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.
>>
>
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