[Strawbale] concrete footings
mark at lowenergydesign...
Mon Feb 13 09:59:50 CET 2006
Tyres are not acceptable on this site - fear of leaching of toxins
(whether legitimately or not, I'm not sure, but that is the position
taken by the people responsible for the site). Lime concrete is
something I will look at - any suggestions for where I can find data on
structural strength / acceptable loadings?
paul sheraton wrote:
> Hi Mark,
> I know you are asking about concrete footings but I was wondering if
> you had thought about using tyres filled with earth/rubble?
> a trench with a low tyre wall as footings, the tyres filled out with
> earth (possibly with some lime mixed into the earth). With a wooden
> sole plate/plank pinned down onto the footings for the wall to be
> built on.
> Have you thought about using lime concrete in place of cement
> concrete? It has half the embodied energy of cement.
> Just some ideas, all the best for your project
>> From: Mark Bigland-Pritchard <mark at lowenergydesign...>
>> Reply-To: European strawbale building discussions
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>> Subject: [Strawbale] concrete footings
>> Date: Mon, 13 Feb 2006 01:12:31 -0600
>> Hi folks.
>> I'm organising the building of a small (30 m2) sb structure this
>> spring, on an environmentally sensitive site. We need to minimise
>> the amount of concrete going into the ground (to minimise embodied
>> energy, to minimise local ecological impact through changed soil
>> chemistry, and to minimise transportation costs). So I've ruled out
>> a concrete pad. A rubble trench foundation is ruled out because
>> there is no suitable rubble locally. I'm therefore looking at some
>> sort of pile foundation. Treated timber below ground level wouldn't
>> meet the ecological criteria set by the site managers, and I don't
>> want to take the risk with untreated timber; my previous experience
>> of using boulders is that it's not the best way to do this because
>> the timbers on top of them have to be individually shaped to fit
>> (time-consuming, and not suitable for the mostly unskilled volunteer
>> labour which we will have). So I'm looking at using concrete piles,
>> probably arranged in something like a 2m grid, to support the building.
>> My question is this: does anyone have experience they are willing to
>> share of using proprietary systems for shaping the concrete such as
>> that at www.bigfootsystems.com ? (Bigfoot make a bell-shaped footing
>> out of recycled plastic, into which the concrete may be poured.)
>> My second, more tenative question is: can this sort of system be
>> used with rammed earth instead of concrete? (I don't think I have
>> the time to learn everything I'd need to know to do this this time
>> round, but it would be good to know what's possible for future work.)
>> Borden, SK, Canada
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