Reinforcing mechanism of lattice-reinforced cementitious composites
insights into flexural performance and material interactions
W. Zhou (TU Delft - Applied Geophysics and Petrophysics)
R.J.M. Bol (TU Delft - Materials and Environment)
Y. Zhou (TU Delft - Concrete Structures)
Z. Meng (TU Delft - Materials and Environment)
Y. Xu (TU Delft - Materials and Environment)
J. Xie (TU Delft - Materials and Environment)
B. Šavija (TU Delft - Materials and Environment)
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Abstract
Lattice reinforcement (LR) demonstrates great potential in enhancing cementitious matrices due to its ability to be strategically designed and additively manufactured to optimize composite properties. To fully exploit the synergy between LR and cementitious matrix, a deep understanding of the reinforcing mechanisms is essential. In this study, five lattice designs with various configurations and sizes were examined through uniaxial tensile tests on dog-bone specimens. It was observed that geometric characteristics, including auxetic behavior, significantly influenced the mechanical properties of lattice structures. At the composite level, the flexural performance of lattice-reinforced cementitious composites (LRCC) was investigated through four-point bending tests. It was found that up to 23-fold enhancements in energy absorption capacity can be achieved with a low reinforcing ratio of 3.5 %. Acoustic emission tests and CT scanning provided valuable insights into the distinct reinforcing mechanisms between auxetic and non-auxetic lattice designs. Furthermore, Finite Element Method (FEM) simulations confirmed that auxetic LR effectively mitigated interfacial debonding.
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