Cob: RV: Cob codes

Mon Mar 13 05:36:51 PST 2000

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Hi cobbers, I'm now working on a sustainable community project for =
people who lost their houses during the natural disaster ocurred in =
Venezuela last December. I need to ask a few questions regarding cob =
practices, codes and  standards:

1) What is the compression resistance of cob per cm2 (or inches)? Is =
datas available from lab tests ?

2) What is the maximum length of straignt walls (no curves) made of cob =
when constructed without columns or pilaster? Or, at what interval in =
meters, is it necessary to strenghten or reinforce a straight cob wall =
with a verticle support such as columns, pilasters, wooden posts or =
other structural member ?

3) How tall could be a cob wall without a floor or roof for structural =
support be built?

4) Do we need below structure roof a "bond beam" to tie the cob walls =
together ?

5) Has anyone added cement (low portion) to cob mixture looking for =
drying walls faster and to improve its strength?  Actually, a lot
of people add cement to adobe blocks. They are stronger than traditional =
adobe, however they don't use straw. What would happened to straw if we =
add cement to the mix for cob? Does anyone know?

Thank you all.

Alejandro Ascanio
FEDDE
Fundaci=F3n Experimental de Divulgaci=F3n y Desarrollo Ecol=F3gico

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<DIV><BR>Hi cobbers, I'm now working on a sustainable community project =
for=20
people who lost their houses during the natural disaster ocurred in =
Venezuela=20
last December. I need to ask a few questions regarding cob practices, =
codes=20
and&nbsp; standards:<BR></DIV>
<DIV>&nbsp;</DIV>
<DIV>1) What is the compression resistance of cob per cm2 (or inches)? =
Is datas=20
available from lab tests ?</DIV>
<DIV>&nbsp;</DIV>
<DIV>2) What is the maximum length of straignt walls (no curves) made of =
cob=20
when constructed without columns or pilaster? Or, at what interval in =
meters, is=20
it necessary to strenghten or reinforce a straight cob wall with a =
verticle=20
support such as columns, pilasters, wooden posts or other structural =
member=20
?<BR></DIV>
<DIV><BR>3) How tall could be a cob wall without a floor or roof for =
structural=20
support be built?</DIV>
<DIV><BR>4) Do we need below structure roof a &quot;bond beam&quot; to =
tie the=20
cob walls together ?</DIV>
<DIV align=3Dleft><BR>5) Has anyone added cement (low portion) to cob =
mixture=20
looking for drying walls faster and to improve its strength?&nbsp; =
Actually, a=20
lot<BR>of people add cement to adobe blocks. They are stronger than =
traditional=20
adobe, however they don't use straw. What would happened to straw if we =
add=20
cement to the mix for cob? Does anyone know?<BR><BR>Thank you =
all.<BR></DIV>
<DIV>&nbsp;</DIV>
<DIV>Alejandro Ascanio<BR>FEDDE</DIV>
<DIV>Fundaci&oacute;n Experimental de Divulgaci&oacute;n y Desarrollo=20
Ecol&oacute;gico</DIV></FONT></BODY></HTML>

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