http://74.125.95.132/search?q=cache:k6mXzCdkm_UJ:www.iprf.org/products/IPRF%252001-4%25202%2520Clay%2520Dispersion%2520Final%2520Report.pdf+effect+o+clay+in+concrete&cd=1&hl=en&ct=clnk&gl=us&client=firefox-a
says that clay reduces strength and increases shrinkage. I have also read that because clay expands when it absorbs water, it causes spalling and cracking of concrete. More than one website said that the clay tends to coat the cement particles and blocks hydration water, making a weaker final product.
I'm certainly no concrete expert, and papercrete is not concrete, so YMMV. As I have said before, I don't put any dirt into my pc, never saw a reason to. Sand/clay will make your final product heavier and reduce the insulation value. It may increase the compression strength but I have found my mix to be plenty strong for my purposes. Water, paper, portland cement, borax are my usual ingredients. Proportions vary depending on the intended use.
spaceman
alexis.marcil wrote:
what would be the effect of mixing clay and portland cement? I've seen a recipe 60 paper 10 clay 10 cement 10 lime 10 sand that seemed nice... thanks ------------------------------------ Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/papercreters/ <*> Your email settings: Individual Email | Traditional <*> To change settings online go to: http://groups.yahoo.com/group/papercreters/join (Yahoo! ID required) <*> To change settings via email: papercreters-digest@yahoogroups.com papercreters-fullfeatured@yahoogroups.com <*> To unsubscribe from this group, send an email to: papercreters-unsubscribe@yahoogroups.com <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
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