[Stoves] Brick making problems

[David Whitfield]

Nice example and advice Crispin.

Does the black tarp cover the bricks only during the night or rainy  
weather to keep them form reabsorbing moisture while drying?

About how many days in your humid climate does it take for thes  
bricks to dry?

They are pretty large too!

tks
D
On Aug 13, 2007, at 10:18 PM, Crispin Pemberton-Pigott wrote:

> Dear Frank
>
> This crack is an example of adhesion of the brick to the support  
> underneath.
> It is interesting that you did not mention any other significant  
> cracks.
> The brick is so big and so soft that the friction between the  
> bottom and the
> surface it is sitting on is enough to prevent the brick shrinking  
> normally
> (and get shorter).
>
> Pouring a mud mix is a way to just about guarantee significant  
> shrinking.
> Try to reduce the water content to a paste instead of wet enough to  
> be 'slop
> moulded' as we call it.
>
> You can a) add chopped straw/grass to give it more strength so that  
> when it
> shrinks it will pull the dead weight of the brick ends towards each  
> other
> instead of breaking, or b) put something underneath so it can slide  
> (like a
> bed of sand) or c) as soon as it can be turned, put it on edge to  
> dry, and
> stack them near each other.
>
> It sounds like they are not being used to keep each other damp as  
> they dry
> very slowly.  There is a good example of drying slowly at
> http://www.newdawnengineering.com/largeimage.php? 
> imagename=tbric015.jpg&retu
> rnpath=/website/brickandtile/tbrick/index.php
>
> You bricks sound too big to stack on end but don't rule it out.  
> Perhaps
> stacked against a strong wall. If you can pick it up (barely) and  
> get it off
> the ground it will be less likely to break as the drying progresses.
>
> Good luck!
> Crispin
>
>
> -----Original Message-----
> From: stoves-bounces at listserv.repp.org
> [mailto:stoves-bounces at listserv.repp.org] On Behalf Of frank
> Sent: August 13, 2007 9:23 PM
> To: Discussion of biomass cooking stoves
> Subject: [Stoves] Brick making problems
>
> Dear brickers,
>
> I am working with the local park service that has the task to rebuild
> the two ends of a two story building (Castro Adobe)  that cracked
> (badly) in the 1989 earthquake.
>
>
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David Whitfield
lists.cedesol at gmail.com
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