John,
My experience in compressing papercrete is using a hand tamper on my old 12 X 24 forms. What I found reaaaaal quick was plain papercrete had to drain a loooong time before it would compress. This is where I started integrating my gin trash into the block. I also used shredded pallets from a place in Lubbock with the same results. The only difference I could see is I have to buy the shredded pallets and the gin trash is free. A lot of the cities have shredders at the land fills and sell the mulch for minimal cost. After transporting a pickup load of shreaded pallets which cost $15 186 miles round trip which is 35 dollars for gas. I will stick to the gin trash. I use 50% coarse material (gin trash, etc) to 50 % papercrete. I add 1-1 masons lime-cement and mix until everything turns gray. I put it in a 2 X 10 X 24 form and tamp it down to 6 inches. My forms come out pretty easy but I have an old butcher knife I run around the form and the form lifts really clean. The block is a lot rougher than a PC block. But after 2 weeks or so of drying in the west Texas sun, woodpecker lips. It is hard to describe the feeling of the block. It does not have the spongy feel of PC. I have some I have dried for over three months and they have a ring to them if you hit them. Not like a bell b ut more like a ripe watermelon. Do I think this is a better way than regular PC. No I just have a lot of gin trash available for free, a commercial application could be developed from this as I think the blocks have better structural integrity than regular PC, which I cannot prove, but mostly just to see if it would work. I does and others can feel free to try. With hydraulic I think a 25% compression would work better than a 50% like CBE's. I have tried to press it down to 50% and it takes too much dadgum effort.
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