Bob,
OK I see where you are going. If your trash pump will blow your line if you had a cut-off at the output end, then I envision a Y with a valve to direct flow near the output of the pump itself. When you operate a trash pump the output could go back into the tank if there is a solenoid that switches output controlled from the nozzle end. The pump can keep pumping but it would shunt the delivery back into the tank rather than to the hose in one position while it would exit the hose in the other. This would be a good project for a Make Magazine reader with a strong "tinker" background.
I wish I were free to take this on, as it will fit right in with my future plans to build with PC some large structures ie a home and a shop. My next major purchases will be a big trash pump and a larger compressor. However, I am still in Alaska, my projects are in Montana, so it will be awhile before I do more. I did get my towmixer completely rebuilt this past summer but I didn't even get a batch made with it prior to returning to work up here.
You asked about the T-lock block shed I was making, and I have to say it is no longer. I had put it in a section of our yard where it would have made the Honda handy to the house but unfortunately it was in the way of an 18 wheeler that came to make a delivery and I tore it down. It took a couple of hours for me to beat the 8" walls apart, remove the blocks and slip form sections, and stacked the whole shebang out of the way. I will be able to use it all over again because the walls I anticipate building will be 12" thick. So I have two ways it could be re-used; imbedded in the pour, or reconstituted in the mixer. I will say that the 5 years the PC shed sat out in the open Montana weather caused it no ill at all. All the different mixes I tried, all the types of paper, were fine and never had a roof over them and even the strong freeze thaw action did it no harm.
Ron
On Sunday, November 3, 2013 3:14 PM, Greg House <ghunicycle@yahoo.com> wrote:
Yeah, sounds like that'd probably work. Probably easier to clean up then AE too!
Greg
Thanks Greg, I may have already solved my problem, which was bake to get PC up two stories high, and I wanted to be able to spray it on the wall if possible. I wanted to use the new trash pump to do this if possible. But it looks like I would still have to have air supply at the point of delivery to do this. I have owned an old air motor powered airless sprayer for years. I used to be able to empty a 5 gal bucket of paint in 15 min, the air powered motor requires a lot of air to power it, which I have. Some roofing companies use this type of airless delivery to alloy AE roofing liqued to roofs, I've never tried to use mine for that, but if it will pump AE, it will pump PC, I'm going to dig it out and give it a try.
In papercreters@yahoogroups.com, Greg House <ghunicycle@...> wrote:
I'm not sure about the pressures involved, but I'd think you'd need similar equipment to what's used for shotcrete, so you might try looking at vendors that supply that industry.
I understand the problem, pressure relief when you want to stop spraying. Not sure I've seen anything designed to directly address that, but I guess you could use a 2-way valve before your nozzle and a 2nd hose to return the unused papercrete to the tank you're pumping from. Sounds like a lot of hassle unless you're planning on spraying
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