Monitoring of 3D concrete printing quality through multi-view RGB-D images

Large-scale 3D printing using concrete is a promising technology in the construction industry. In recent years, with the introduction of new commercial products and some real-world building projects, 3D concrete printing is moving from experimental and lab-scale applications towards regular construction operations in the field. In this paper, a solution for quality monitoring of 3D concrete printed structures after printing is shown. The solution is based on the use of multi-view RGB-D images captured using a low-cost stereo-depth camera. The objects considered in the paper are 3D printed using a gantry 3D concrete printer. The object scanning process is described. Then the 3D reconstruction of the printed structure 3D model is explained. Finally, a quality assessment technique to evaluate the accuracy of the printed structure is introduced. This technique to quantify the printing error, compares the reconstructed 3D model of the actual state of the print and the CAD model used in the printing planning.