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From: Spaceman <Spaceman@starship-enterprises.net>
The stinky stuff the roofers are pulling along is tar, not asphalt emulsion. It is a solid at room temperature and has to be heated to apply it. AE is a form of oil emulsified in water and does not need heat to be applied. To see for yourself how cellulose absorbs AE or oil, take a piece of paper and drip a little AE or oil onto it, and a little water for comparison. Both are absorbed readily.
When I used AE in papercrete I dumped a pint into a 5 gallon bucket of slurry and stirred it around. It acted pretty much like "normal" pc, molded well, though it did have an odor at first. After it set I floated it in a tub of water for hours, and it did not absorb any water. It sat around for a year or so before one of my helpers mistakenly threw it into a mix. Photos at
http://files.starship- enterprises. net/PC%20panel% 20floating. jpg
http://files.starship- enterprises. net/PC%20panel% 20floating% 20after%20eight% 20hours.jpg
Spaceman
It may look good on paper, but once you actually do it the reality is different .
sire@comcast.net wrote:John,Well yes of course tar paper is made by saturating some kind of coarse cellulose fiber with asphalt emulsion, but what is the manufacturing process involved in making that? I would guess that heating the asphalt and/or paper is involved, and spraying is involved, since I don't think that paper will absorb asphalt anywhere near as easily as it absorbes water. Heating it might be essential, and isn't that what those roofers do trailing that stinky stuff behind in a heated tub? So without heating or spraying the asphalt directly on the paper, I don't think it will mix very well with paper just by dumping it in a mixer with paper and cold water. Just my thought...... Jack Bays probably paid only $3 for a 5 gal pail of asphalt, and he probably never heard of perlite. I wonder if he would do it the same way today?Neal
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