Cob Re: Particle Size Distribution

[John Hall]

uwe wrote:
> 
> Hi John and M J,
> 
> wow, that was a very thorough explication! Well, I already suspected that the jar test wasn't very precise, but as now both of you (and 
perhaps others, who's p
> 
> Uwe

It is important to have a balanced mix, so checking the particle size 
distribution is important.  Over 20% (approx) clay and you can expect 
shrinkage, and over 30% (approx) big shrinkage, and over a longer time 
period. Besides, the higher the clay content, the harder it will be to 
work!

Regards,

John Hall.