Additive manufacturing, precision robotics and architected design markedly increase crack resistance in concrete.
Taking inspiration from nature, researchers from Princeton Engineering have improved crack resistance in concrete components by coupling architected designs with additive manufacturing processes and industrial robots that can precisely control materials deposition., researchers led by Reza Moini, an assistant professor of civil and environmental engineering at Princeton, describe how their designs increased resistance to cracking by as much as 63% compared to conventional cast concrete.
To generate these mechanical properties, the researchers proposed a design that arranges concrete into individual strands in three dimensions. The design uses robotic additive manufacturing to weakly connect each strand to its neighbor. The researchers used different design schemes to combine many stacks of strands into larger functional shapes, such as beams.
Shashank Gupta, a graduate student at Princeton and co-author of the work, said that creating architected concrete material with the necessary high geometric fidelity at scale in building components such as beams and columns sometimes requires the use of robots. This is because it currently can be very challenging to create purposeful internal arrangements of materials for structural applications without the automation and precision of robotic fabrication.
Selective laser sintering is one of the most widely used processes in additive manufacturing, but it is limited to printing with a single material at a time. Robotics engineers have now developed a ...
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