Presented By: Avinaya Tripathi, Arizona State University
Description: This paper discusses the use of digital image correlation (DIC) to assess the buildability of 3DP-concrete wall elements as a function of time after mixing. DIC is used to track the displacement profiles of four of the bottommost layers to predict failure. This approach identified a failure initiation height corresponding to the plastic deformation of the printed structure before visible collapse of the structure. This visible failure height was observed to be similar to or higher than the failure initiation height, and the difference depends on the mixture characteristics (particle packing and stiffness), and the time since mixing. Average verticle strains and strain build-up rates are also used to infer time-dependent buildability of the mixtures. The strain build-up rates are inversly related to the stiffness development. The proposed approach and can be used to evaluate buildability and to dynamically adjust print-paths to enhance the buildability of fresh 3D-printed mortars.