The name "concrete" is misleading. The paste is more of a grout using fine aggregates whereas concrete typically has coarse aggregates. With the absence of coarse aggregates, the vibration requirement is minimized. As for reinforcement, simple paste as shown would be weak indeed unless they are adding fibers to the mix (glass, polyester, metal are typical) which would be likely in this case although not stated. The "laminations" would likely impart some strength as well.
As for fireproof, the structure has little in it (other than furnishings) that would be combustible. A final concern is the strength of the mix. Typical cement mixes achieve ~15% of their strength in 24 hours (full strength in 28 days). Again additives or high early strength mixes could be used which could solve that. Either way, I would want the structure to fully "cure" prior to moving in. That means for me waiting a month no matter how fast they print it. I find the technology interesting and in certain circumstances could be useful for developing structures in remote areas where transporting pre-engineered structures and or components might be cost prohibitive. Apic Cor has a video of them printing a "house" and how they reinforced and insulated the structure for -35C conditions. Kinda smallish but it can easily be nested with other units to create office/work and or living spaces. On Wed, Jun 21, 2017 at 11:49 AM, Nicklas Karlsson < [email protected]> wrote: > > 3D concrete printing > > > > https://www.youtube.com/watch?v=zb3zuk1qNDk > > Without rebar and vibration concrete will be weak, maybe it's good enough > for a real firewall? > > ------------------------------------------------------------ > ------------------ > Check out the vibrant tech community on one of the world's most > engaging tech sites, Slashdot.org! http://sdm.link/slashdot > _______________________________________________ > Emc-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users > ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
