[Cob] re Next Step (Janet Standeford)

[Janet Standeford]

Thank you, Kathy

Kathy Dunster wrote:
> He was looking at low-cost housing alternatives for survivors of the 2006
> tsunami in Sri Lanka, obviously seismic stability is important in that
> region.
>
> Direct link to the full 182 page Daigle thesis is
>
> http://www.earthbagbuilding.com/pdf/Daigle_Bryce_C_200809_MScEng.pdf
>
>
> "It was determined that the compressive strength of *unplastered* earthbag
> housing specimens meets or exceeds the vertical compressive strength of
> conventional stud-frame housing technology using a variety of fill
> materials, with the greatest strength being observed for soilfilled bags."
>
> Note "unplastered" as he concludes more work needs to be done on plastered
> earth bag buildings as in a good shake the plaster would probably fall off,
> but would not compromise the integrity of the building's structure.
>
> He also concluded that
>
> 1. "Stack height affects the strength and stiffness of earthbag specimens,
> with taller stacks (i.e. 6 or 9 bags) exhibiting lower strength and
> stiffness values, as well as different load-deformation behaviour than
> shorter stacks (i.e. 3 bags)."
>
> 2. The testing procedures outlined in ASTM E 447 are inadequate for testing
> earthbag specimens due to their reliance on 3-unit stacks which may
> overestimate compressive strength.
>
> 3. Soil-filled bags measuring 457 x 762 mm require loads in excess of 840
> kN to reach bag failure (defined as a loss of fill leading to reduced
> compressive load-bearing capacity). This is also true for soil-filled bags
> measuring 508 mm x 914 mm.
>
>
> -------------------------------------------------------
> Kathy Dunster
> Denman Island, B.C. Canada
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