Hi There;
<<<<<<<<<< sticking better to the side of our metal barn >>>>>>>>>>>>>
<<<<<<<<<< poured and even tamped down next to each other>>>>>>>>>>>
I am having trouble understanding what you are doing? The first line makes me think that you are applying it like a stucco to the metal siding of your barn? The second line sounds like you are filling molds..... do you have a sketch?
<<<<<<<<<< the addition of the sand and clay affect the R-value >>>>>>>>>>
It would be nothing more than a guess about R-Value changes without scientifically calculating every aspect. It would also be hard to understand the value in the mass factor that is added. The fire retarding improvement of these added materials well justifies the insignificant r-value change in my book. A need for a plan that has definable performance goals and expectations would help you discern ultimate wall thickness. None of the mix designs I use have ever exceeded R-3 per inch......... none have fallen below R-2 per". My argument for using P/C to encapsulate R-45 strawbales gains credibility when one tries to acheive that performance making a bazzillion baches of F/C that take all summer to apply. The main bales are always installed in one day and are coated by the end of the week!?
<<<<<<<<<<< they shrunk away from each other >>>>>>>>>>>
The cracking / shrinkage is the end result of the latex causing premature curing. Latex speeds the cure time significantly. To use a 3 coat method of application traditional stucco method will add to the bonding ability and reduce cure related problems. Then the final -3rd- color texture coat is the only one with latex. I would never recommend latex added to block making across the board. The cost is an issue as well as curing / shrinkage issues..... sooo only if their is a specified need. Blocks ultimately will get a protective coating anyway... and this is where water resistance is dealt with.
Hope this helps............. Bob M.
--- In papercreters@yahoogroups.com, "Robert & Connie" <losee04@...> wrote:
>
> Hi, Robert.
>
> In our last 2 batches of papercrete, we used your formula w/the
> paper, concrete, lime, sand and clay. Per your suggestion it adheres
> better, we do find it is sticking better to the side of our metal
> barn in our two small experimental spots.
>
> We found it fascinating that the small addition of the clay changed
> the color into a bit of a natural adobe color--love it.
>
> My question is, do you know how much the addition of the sand and
> clay affect the R-value of the papercrete?
>
> We made a second batch as above but this time added about 1.5 cups of
> latex paint. Does anyone know how this affects the R-value?
>
> Even though the two batches were poured and even tamped down next to
> each other within about 1 1/2 hours or less of each other, they
> shrunk away from each other, leaving a significant gap between the
> two "logs" or two small retaining walls. Does anyone have an
> explanation of this? Why would such a small amount of latex make
> such a big difference?
>
> Connie
>
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