Preparation and compressive properties of cementitious composites reinforced by 3D printed cellular structures with a negative Poisson's ratio

Abstract

In recent years, negative Poisson's ratio structures have attracted many scholars' attention as a result of their distinctive mechanical properties and exceptional energy absorption ability. However, the geometry of structures with negative Poisson's ratio is generally complex, and the preparation of the model has become problematic. Therefore, the increasingly mature additive manufacturing industry can be used to prepare three-dimensional models. In this paper, five negative Poisson's ratio structures were fabricated by 3D printing, and cementitious materials were poured onto them. The purpose of this study is to investigate the mechanical properties of different structural reinforced concrete specimens under in-plane quasi-static uniaxial compression and obtain the deformation and failure modes of different structural reinforced concrete specimens. In the experiment, two-dimensional digital image correlation (2D-DIC) and acoustic emission (AE) techniques were used to obtain plane displacement and internal damage evolution, and the plane strain field was calculated using Vic-2D software. The experimental results show that the ductility and energy absorption capacity of structural reinforced concrete specimens have been significantly improved, and there are significant differences in the performance of different structural reinforced concrete due to different deformation modes.

Keywords

• 3D printing
• Negative Poisson's ratio structures
• Quasi-static compression
• Cementitious composites
• Energy absorption