[Greenbuilding] Hot Tub Building

[Keith Winston]

But curing and initial hardening are different things. I believe 
ferrocement is typically worked one side at a time, with enough setting 
in the meantime to allow the next layer. It can take concrete 30 days to 
(mostly) cure, for example. Cold joints involve a delay of 1.5-6 hours 
between concrete applications, I believe, depending on concrete and 
temperatures, etc. Retarded-set concrete can extend this time.

Keith


Clarke Olsen wrote:
>      With any concrete work, it is advisable to avoid cold joints 
> (separate layers not curing
>      at the same time). Forget "chicken wire", what you want is expanded 
> wire lath.
>      Clarke Olsen
>
> On Aug 11, 2007, at 10:54 AM, Speireag Alden wrote:
>
>   
>> Sgrìobh Ken Beiser:
>>
>>     
>>> The ferro-cement is
>>> actually easier and can be pretty free form.  Not really that much 
>>> concrete
>>> when push comes to shove.  The idea is to make a form and stretch 
>>> chicken
>>> wire over it in multiple layers tied together and then pull the form 
>>> and
>>> "plaster" from the inside and out at the same time.
>>>       
>>      How do you accomplish that, the inside-and-out at the same time?
>> I've heard of ferrocement, but I always had the impression that it
>> was done in multiple layers, permitting the first to cure enough that
>> it provided a substrate for the second.
>>
>> -Speireag.
>>     
>
>
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-- 
Keith Winston
Earth Sun Energy Systems
Hyattsville, MD 20781
301-980-6325
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