The shape of extruded concrete filaments drastically affects whether a 3D-printed structure stands or fails.

When construction crews 3D-print concrete, a nozzle squirts out wet layers called filaments to build up walls. Engineers use computer models to test if a design will collapse during printing. Most simulations assume each printed strand is a neat, flat rectangle. In real life, wet concrete squashes and curves, making those predictions inaccurate. Researchers solved this by pairing a deep-learning tool named ShapeGen3DCP with structural simulation software. This artificial intelligence predicts true strand shapes from basic printing settings, skipping the need for slow fluid tests or physical lab trials. The team found that strand shapes strongly sway how stable walls are. True curved shapes matter most during free-flow printing, while pressed layers care less about shape simplifications. When balancing speed and accuracy, treating filaments as ellipses works well. If engineers must use simple rectangles, sizing them by conserved volume works best.

Why it matters

For engineers using 3D concrete printing, accurate predictions prevent costly structural failures. By modeling the real filament shape instead of assuming simple rectangles, simulations become more reliable, saving time and materials in construction.

Questions answered