Have Mud, Need Robot. A stacking test of normal concrete with a 3D-Admix injected inline. скачать в хорошем качестве

Have Mud, Need Robot. A stacking test of normal concrete with a 3D-Admix injected inline.

https://spacecrete.com/ Our other videos have comments - only this one is turned off. This is a test of overkill thickening! Only to see how fast we can stack pumped concrete. This test mix is way too stiff for a real job. Please see SpaceCrete 2.0 for a more workable mix (and to leave a comment). This concrete was a 3” slump in the hopper, and then was instantly converted to a highly thixotropic slump by a new admixture injected into the pump line. A normal dose for 3D printing etc, would be 1/3 of what we used here, and that concrete would be more workable. The starting slump can be more than 6”. We have proven that vertical stack rate is not limited by available concrete rheology, if this inline injection is used. So, for typical jobs, you can effectively stack the concrete faster then it can be pumped. Normal low-cost redimix concrete can be ordered by the truckload, then injected at 1.25 gallons per yard with this admix (while pumped), to become 3D-printable. At any vertical rate needed for very-large-scale rapid additive-manufacturing. For this test, 7-sack pea-gravel concrete with fly-ash was ordered by phone. 3/4" rock stacks better with less concrete, but we only have a 3/8" grout pump. No fibers, no silica fume, no polymers, no VMAs, no other SCMs, no admixtures of any kind were included. This was pumped with our 1974 Mayco ($2500) single-piston grout pump, to the inline injection/intermixer, where our thickening admix was triple-dosed in this case. As you can see, the old grout pump was having a hard time getting this stiff mix out the hose. A normal concrete pump would have no problem. A typical admix dose would be 0.25% of concrete mass (1.25 gal/yd), this test was about 0.75%. If 3D-printable concrete is to be ordered by the truckload, a fast stack rate is required to empty the truck without paying standby time. With powerful NC robotic extrusion, this concrete could be placed quickly and nicely, and of course it does not need to be nearly as stiff as you see in this test of extreme. Hydration stabilizers, such as Delvo, do not really reduce the stiffening and setting effects provided by this admix, so an unlimited open time is possible with this method. And, this injected concrete shrinks less than otherwise identical concrete. Skepticism is totally understandable; but this method development started in 2009, so our rate of progress is very realistic. Our next test will be to place a thick version of a one-coat stucco, to build fireproof cladding as quickly and as inexpensively as possible. Of course this concrete can also be used for the wire-mesh/foam panels etc. Working on it, thanks!