On the tilt up panels I made I put 25 gauge metal framing studs on
after the slabs dried. There would have been too much shrinkage in my
PC mix to put them on any earlier.
Here are some armature examples that I left hollow. The only
difference with my battery room will be that it gets filled with PC.
http://ferrocement.net/gallery/thumbnails.php?album=31
http://greenacre-hotsprings.blogspot.com/
http://screwdecaf.cx/eco-lodge.html
Pouring with rebar would probably have worked. We wanted to use
locally harvested found wood just to be more PC with our PC.
On Aug 15, 2007, at 5:42 PM, mountainfair wrote:
> Mikey - so, you added the stud frames before tilting the panels up and
> this prevented them from breaking?
>
> Could you post some pictures of the armatures that you use? I am
> having a hard time picturing how this works exactly, but would love to
> learn more.
>
> Is pouring with rebar or other metal reinforcement a problem due to
> shrinkage of the pc away from the metal?
>
>
> Thanks!
>
> Eli
>
>
>
>
>
> --- In papercreters@yahoogroups.com, Mikey Sklar <sklarm-yahoo@...>
> wrote:
>>
>> The 4'x8'x4" panels I made had just enough strength to tilt up and
>> flip over. After about 10 days of drying with no rain the panels
>> seemed to be strong enough to add metal framing studs. Once the
>> panels
>> were incased in studs they could be put in place without concern for
>> breaking them in transit. I had broken several panels during the tilt
>> up process until I learned how to recognize when a panel was ready to
>> flip and do it smoothly with two big levers. A PC mix rich in
>> Portland
>> and sand would have helped.
>>
>> As for slip forms I would not use them for walls above 5'. At that
>> height or greater I make custom armatures out of 3/8" rebar, 6"x6"
>> welded wire, and 2.5lb expanded metal lath.
>>
>> I have also built 8' high PC block walls, but that too I found too
>> time consuming and labor intensive. The block wall results also came
>> out quite sloppy due to poor craftsmanship on my part.
>>
>> On Aug 13, 2007, at 3:30 PM, "mountainfair" <yahooposting@...
>>> wrote:
>>
>>> Can you tell me more about the strength - are you saying that they
>>> lacked strength?
>>>
>>> I am OK working around long dry times, and have a stand in for a
>>> fork
>>> lift that I could use to move large panels around with (might
>>> need to
>>> figure out how to include loops sticking out of the panels to attach
>>> chains to).
>>>
>>> But if strength is an issue, forget it. I was thinking of using
>>> cattle panel (galvanized rod in roughly 6" squares maybe 1/4 inch
>>> dia)
>>> in the middle.
>>>
>>> Did your 4x8 panels break?
>>>
>>> Arent you concerned with the weight of wet pc when the slip form
>>> is at
>>> the top of the wall?
>>>
>>> -Eli
>>>
>>>
>>>
>>> --- In papercreters@yahoogroups.com, Mikey Sklar <sklarm-yahoo@>
>>> wrote:
>>>>
>>>> I have some experience with tilt up 4'x8 panels. It is hard work
>>>> and I
>>>> doubt I would do it again despite the good looking fence I got
>>>> out of
>>>> the 60 panels that were made. The three problems with large tilt up
>>>> panels I found were:
>>>>
>>>> 1. Moisture (long dry times)
>>>> 2. Weight (minimum 2 people to move and place 150lb panels.
>>>> 3. Strength (we reinforced with salt cedar as rebar inside the
>>>> panel
>>>> and framing studs on the outside.
>>>>
>>>> On future walls I will be building double armatures or make use of
>>>> slip forms. Combined with a concrete pump or diaphragm pump I
>>>> expect
>>>> the work to be a order of magnitude faster.
>>>>
>>>> On Aug 13, 2007, at 4:39 AM, "mountainfair" <yahooposting@
>>>>> wrote:
>>>>
>>>>> Thanks for your replies, Spaceman and Mikey. I am getting a
>>>>> better
>>>>> picture of all that is involved. Sounds like spraying a
>>>>> thicker/larger dome is not a good idea, but having a sprayer
>>>>> to put
>>>>> the final coat/stucco on projects will be important.
>>>>>
>>>>> For larger projects, it sounds like casting on the ground would be
>>>>> easier.
>>>>>
>>>>> Any experience casting large panels (like 8' or 10' x 20') and
>>>>> tilt up
>>>>> construction? If one could cast an entire wall on the ground,
>>>>> with
>>>>> doors and windows framed in, this could save a lot of time and
>>>>> energy.
>>>>> Would need a loader/lift to pick it up, and some way of attaching
>>>>> the
>>>>> panels to the footer and perhaps a beam or something on top...
>>>>> Would
>>>>> love to hear if others have any experience with this.
>>>>>
>>>>>
>>>>> -Eli
>>>>>
>>>>>
>>>>>
>>>>>
>>>>> Yahoo! Groups Links
>>>>>
>>>>>
>>>>>
>>>>>
>>>>
>>>
>>>
>>>
>>>
>>>
>>> Yahoo! Groups Links
>>>
>>>
>>>
>>>
>>
>
>
>
>
>
> Yahoo! Groups Links
>
>
>
>
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