Papercreters: [papercreters] Re: papercrete shrinkage

Monday, September 29, 2008

[papercreters] Re: papercrete shrinkage

There are principly two points in time when one can obtain near
complete bonding to papercrete veneer - as in "papercrete sticks to
papercrete like hair in a bisquet" - new plaster veneer should be
applied before the 7 day set window, if not before the 4 day window-
if not then the substrate should be totally dry - since we began
filling the papercrete with aggregate (perlite) we see total drying in
three weeks and minimal shrinkage- Most are hesitant to invest in
additional materials - It could be sand if you deal with the weight,
still the point here is that it is very helpfull to have a draining
mix, yes- Additionally, there is the issue of excess calcium
carbonate,leftover from the portland cement reaction ( perhaps 20 %).
We strongly advise the use of pozzalonic materials to react the free
lime, which is what is holding all the excess water and thus cracking
and shrinking- skip the shade cloth and focus on the mix- Hope this
helps! - Clyde --- In papercreters@yahoogroups.com, "Janoahsh"
<janoahsh@...> wrote:
>
> I remember reading that it is difficult to get papercrete to stick
to other
> surfaces because it pulls away as it dries and shrinks. It was also
> mentioned that this makes it difficult to build up in layers, the
resulting
> joint between layers having a tendency to delaminate.
> I will be doing some experiments using old fishnet, plentiful here,
to help
> with drainage and bind successive lavers together.
> Two Questions
> 1 Is there a problem, with bond, stuccoing to dry papercrete?
>
> 2 What can be done to improve bonding between layers of sprayed on
> papercrete?
>
> Janosh
>
> No virus found in this outgoing message.
> Checked by AVG - http://www.avg.com
> Version: 8.0.169 / Virus Database: 270.7.4/1695 - Release Date: 9/
27/2008
> 1:11 PM
>