Static and dynamic compressive behaviour of 3D printed auxetic lattice reinforced ultra-high performance concrete

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This paper presents a systematic experimental study on static and dynamic compressive behaviour of 3D octet, re-entrant honeycomb and triangular lattice reinforced ultra-high performance concrete, i.e., O-UHPC, H-UHPC and T-UHPC as well as steel fibre reinforced UHPC (S-UHPC). Mechanical tests were conducted to investigate the static and dynamic compressive behaviour of UHPC composites including failure pattern, stress-strain curve, dynamic increase factor (DIF), dynamic compressive strain and energy dissipation under various strain rates (i.e., 0, 34.8, 59.7, 86.7, 108.5 and 134.7 s−1). The plain UHPC and S-UHPC were used as references for comparison. Results indicate that H-UHPC has a 14.6–19.4% higher static compressive strength than O-UHPC and T-UHPC. S-UHPC exhibits higher dynamic compressive strength at lower strain rates, while the dynamic strengths of H-UHPC and T-UHPC at higher strain rates reach the highest, i.e., 262.7 MPa and 222.2 MPa, respectively. The highest total energy and post-crack energy at high strain rates take place on H-UHPC. Overall, H-UHPC has comparable static compressive behaviour but better dynamic compressive behaviour at high strain rates in terms of strength, ductility, energy dissipation and DIF, compared with other UHPC specimens, suggesting that re-entrant honeycomb is a better choice for manufacturing UHPC with optimal auxetic 3D lattices.