[Stoves] Fly ash cement and levels of levels of radioactivity?

Bamboo Science Group greg at bamboosciencegroup.com
Mon Feb 9 09:42:12 CST 2015


As you guys delve into fly ash cement, I was curious if the levels of some of the ashes radioactive elements (Cs-137, Sr-90 and K-40) have been measured. The fly ash concentrates these natural occurring isotopes and could be problematic. 
G

Sent from my iPad

> On Feb 8, 2015, at 6:21 AM, Crispin Pemberton-Pigott <crispinpigott at outlook.com> wrote:
> 
> Thomas, what a great and brief reintroduction.
> 
> Thanks for the name and reference.
> 
> This is a good link:
> 
> http://www.philipcoppens.com/davidovits.html
> 
> Perhaps we should be looking for a different solution entirely.
> 
> Crispin
> 
> 
> -----Original Message-----
> From: Stoves [mailto:stoves-bounces at lists.bioenergylists.org] On Behalf Of T
> Hastings
> Sent: Sunday, February 08, 2015 17:19
> To: Discussion of biomass cooking stoves
> Subject: Re: [Stoves] Fly ash cement, Curiosity.
> 
> Hi Michael, Crispin and all the list members,
> 
> Rather than answering or responding to all the questions and notes raised on
> this topic I will try and share with you some of my experience on Fly ash
> for stoves.
> 
> What I believe Michael has read about and discussed with Zeobond is Fly ash
> based geopolymer. These are cement like materials made by mixing Coal fired
> power station waste (fly ash) with an alkali activator. The theory is that
> the alkali dissolves at least a portion of the fly ash which is mostly
> aluminium and silicon. These ions recombine to former a polymer or chain
> like structure utilising the alkali cation to balance the charge of the
> aluminium atom.
> 
> Several companies are developing it as a low CO2 replacement for OPC
> (Ordinary Portland Cement) They mix the binder with regular aggregates to
> make a OPC substitute.
> 
> In Australia, Zeobond have used a fly ash material to make footpaths and
> some precast past. The mixing plant they refer to is a cement batching
> plant...its big.
> Another company in Queensland, Wagners have made very large precast beams
> for a government building and are or will be making a airport runway from
> their Earth Friendly Concrete.
> 
> You can look Wagners up here http://www.wagner.com.au/capabilities/efc/
> 
> In South Africa, geopolymer is also making inroads For example  0% cement
> concrete - M&R geopolymer concrete a South African first!!
> https://www.youtube.com/watch?v=wArEbfC91m0
> 
> My own work at Unity Stove is similar but different. For these companies to
> be successful they have to produce a product that is comparable in price and
> performance to bulk portland cement type concrete for building works. I am
> really not how sure their materials will work in furnace lining type
> applications like the inside of solid fuel stoves.  The KSIAL material
> developed by Unity Stove is more expensive to manufacture as it uses a far
> greater portion of activator to try and achieve more dissolution of the
> aluminium and silica sources. We also use different aluminium and silica
> sources ( due in part to fly ash coming in tanker truck loads only) Also to
> avoid legal issues KSIAL is based on old patents....yes geopolymers having
> been around long enough for patents to expire. Like their materials, KSIAL
> it not a DIY just add water product like portland cement so it very hard to
> bag some up and hope that an experimenter follows the instructions to mix
> and cure correctly.
> 
> I am sure it a type of stove material that some of the well funded
> organisations working in this field will pick up and run with one day.
> As I have been promoting, geopolymer materials such as KSIAL will allow
> corrosion resistant stoves to be produced in small workshops using readily
> available materials. Stoves can be repaired and or crushed and recycled to
> make new stoves. It is compatible with insulating aggregates such as
> perlite, scoria and wood ash and can even be foamed to make a stove liner,
> pot support and insulation in one piece. Its low thermal conductivity means
> the surface may get hot but will not instantly burn skin in the way a metal
> stove can.
> 
> Anyway Michael, you are definitely on the right track with Fly Ash cements
> and I would just love to pop over to the Marshall Islands with a 20'
> container of materials and everything needed to start a mini factory and
> start making stoves with you.
> 
> Regards
> Thomas Hastings
> Unity Stove
> 
> 
> 
> 
> 
> Some keywords for further research if you are interested in researching this
> type of material further. Be aware though that Prof.
> Davidovits does believe the pyramids are constructed from Geoploymer and has
> even reconstructed and demonstated how they could have been built using Nile
> silt and Natron.
> 
> Davidovits Geopolymer alkali activated cement refractory foam and of course
> google Unity Stove to see Geopolymer stoves in use.
> 
> 
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