Interesting observations. A couple of dumb questions. First, what is the difference between slaked lime and regular hydrated lime? Where is ammonium sulfate available? I am currently making blocks with cardboard pulp and clay with no cement and I bought some boric acid to spray the walls with (when they're finished, of course) for fireproofing as I talked to some straw pale people who do that for fire retardancy and also to repel insects. I haven't tried it yet so don't know if it will work or how well. As for used vegetable oil, I have been collecting that for some time now to power my pickup with and last winter after noticing how the oil that spilled on the top and the sides of my barrels interacted with the fine clay dust to make a hard rubbery coating, I made a mixture or oil and portland cement with a small amount of fine sand and coated some of my walls I had put up for a windbreak. It dried into a hard cementous surface with the ability to shed water which is great because all papercrete regardless of the amount of cement uses will absorb water. I did not do this very scientifically as to the proportions of the mix but was very pleased with the results. I also coated part of a wooden structure and it stuck very well to that and also an adobe shed and once again it coated that well. It makes kind of a greenish color to the blocks but perhaps in the summer sun will bleach out. I plan on doing more with this when I get my house walls up. I applied this with a paint brush and not very thick but one could use a roller to speed up the process. The beauty part is that it doesn't take a lot of the mix and with the oil in mixture it absorbs readily into the papercrete./fidobe. --- On Tue, 5/4/10, germeten <germeten@yahoo.com> wrote:
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