A Novel 3D-Printed Negative Poisson's Ratio Grid-Reinforced Cement-Based Composite Wall Structure (2025-11)¶

Auxetic structures theoretically offer significant potential for regulating material damage evolution; however, the understanding of their synergistic mechanisms with cement matrices under multi-field coupling conditions remains limited. This study employs 3D printing technology to fabricate two-dimensional re-entrant honeycomb auxetic structures with three distinct angles using PA12, which are embedded as reinforcements in cementitious materials to construct novel cement-based wall structures. Uniaxial compression tests combined with digital image correlation (2D-DIC) and acoustic emission (AE) monitoring reveal that these novel cement-based wall structures not only retain the anomalous mechanical properties characteristic of cement composites but also exhibit compressive strength enhancements of 64.78%, 58.04%, and 47.70% compared to conventional walls, along with post-peak energy absorption capacities per unit volume increased by 99.5, 54.23, and 83.42 times relative to the control group. Strain field analysis demonstrates that the precisely controlled geometric topology of the novel wall structures effectively suppresses lateral expansion of the cement matrix and delays crack propagation. AE signal characteristics indicate that the novel wall structures facilitate a transition in damage evolution from brittle to ductile failure, promoting more orderly crack development. Furthermore, damage pattern classification based on factor analysis and fuzzy C-means clustering corroborates the restructuring effect of the novel cement-based wall structures on damage chronology. This research demonstrates that 3D-printed auxetic-reinforced cement-based wall structures exhibit exceptional compressive performance, energy absorption capacity, and damage regulation capabilities, offering innovative solutions for high-performance structural design in seismic-resistant construction and protective engineering.