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A Lightweight, 3D-Printed Alternative to Reinforced Concrete Beams
Why not extrude on site to the desired length? The joints cost material and weight. It would be nice to have more detail about strength, weight and composition. What about fire resistance?
How does snapping together affect the strength? I can see the concrete infill stiffening the reinforcing elements, and continuing compressive strength through the length, but what about the tensile strength? And what about fire/heat resistance? How do they compare in strength to a similar section of steel? The article leaves a lot of questions on the table.
Why not just extrude the profile instead of 3D printing it? The customized parts will still need to be printed on or near the site but the longer profiles should be more affordable as extruded lengths.