[Cob] gypsum

[Scott Van Kirk]

Where do you get your sawdust?

-Scott


On Fri, 07 Nov 2003 14:50:48 +1100, Lance Collins <collinsl at bigpond.net.au> 
wrote:

> Hi Scott,
>
>> The compressive strength as measured by the guys at SW Desert 
>> Sustainability while
>> I was there was between 200 and 300 PSI. This mirrors the results that 
>> the building
>> code officials found when using this recipe, so I'm pretty confident in 
>> the numbers.
>> They use this in Turkey and India by making much thicker walls.  They 
>> also have more relaxed codes (if any).
>
> I didn't scientifically test my blocks but they were better than my adobe 
> blocks stabililized up to 10% cement which tended to shatter when dropped 
> from waist height onto firm ground.  I'm only planning on infill walls 
> anyway.
>
>
>> Just curious, how did your block weather?
>
> They were only out in regular rain for a couple of months.  Quite water 
> absorbent but no erosion.  I suspect that if a wall of my blocks were 
> under eaves and possibly treated with a water repellent such as acropol 
> they would be quite OK.
>
> Lance
>
> p.s. I moved on to sawdust-crete(?) after this.  Still water absorbent 
> but dropable from shoulder height without damage.
>



-- 
-Scott