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Has anyone used a pugmill to mix and extrude concrete before?

I know pug mills are used in both ceramics and concrete industrial to make RCC and permeable concrete utilizing a paddle pugmill (at a much larger scale). But I didnt know if running a premix low slump through the pug would act as an ad hoc tybe extrusion for a unique concrete delivery experiment.

Edited by connor
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I don't know of anyone, who has ever tried it, but I'm going to say, go ahead and not do that.

Even if the concrete doesn't have a lot of larger aggregate, the hard bits, like the sand is going to tear up the inside of the pug mill. 

Sure, some clay has grog,  but that's generally a lot finer than the sand in concrete. 

On top of that, concrete is slightly caustic, which could pit the inside of the pugmill, more than clay would.

Then there's the issue of cleaning it fully, so the dried concrete doesn't ruin it...

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If you are trying to create decorative, concrete designs, you'd be better off using molds/ forms.  And I've also seen masons use templates, to form the concrete, in place, once it has set up a bit.  So if they are creating the base of a column, they apply the concrete, in the basic shape, then use the form to scrape across it, to create the specific contour.

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Wrong  motion-I own two concrete mixers at the moment. Mixers spin the mix and its abrasive and caustic . The mix falls on itself. Thats how it mixes.

In a pug mill the motion is not that at all.-It also would mean a complete clean out and it will abrade the interior.The aggregate is very abrasive in cement.

really bad idea.

Instead how about using ready mix in bags and mixing in a wheelbarrow -use a hoe to mix the water in.

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I think OP wants to use the pugmill as a sort of extruder. Perhaps a simple extruder would work as well and be much easier to clean. However, cement/concrete sets up so quickly, relative to clay, that I think there would be many other technical difficulties with such a process. I know that in the big concrete mixer trucks, they don't dare stop the barrel's rotation or the concrete hardens and the driver has to climb inside and hammer-and-chisel it out.

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