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[Cob] re Next Step (Janet Standeford)Janet Standeford janet.standeford at gmail.comWed Jan 13 18:13:31 CST 2010
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 > _______________________________________________ > Coblist mailing list > Coblist at deatech.com > http://www.deatech.com/mailman/listinfo/coblist > >
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