Auxetic boosting of confinement in mortar by 3D reentrant truss lattices for next generation steel reinforced concrete members

Research output: Contribution to journalResearch articleContributedpeer-review



A study is presented on a new method for confining concrete/mortar materials using steel auxetic truss lattice reinforcement. The study builds on major advances in architected materials and a new concept for the confinement of structural members. Numerical results are presented on a unit cell of the new composite including a mortar matrix and a steel reentrant auxetic lattice as reinforcement, followed by a small scale experimental phase where 3D printed steel auxetic lattices are encased in mortar and tested under axial compression. Several findings emerge: the auxetic lattice applies enhanced confinement to the mortar matrix, the new composite exhibits significant strength increase compared to plain mortar specimens and the composite has a remarkably ductile behavior, with a high residual strength that endures to strains in excess of 20%. The experimental results are further validated through computational modeling. The findings of this paper demonstrate the high potential of using auxetic lattices as reinforcement in a concrete/mortar matrix with advantageous properties for structures in terms of strength and ductility which are crucial in the response of structures under extreme loading conditions such as earthquakes.


Original languageEnglish
Article number101681
Number of pages10
JournalExtreme Mechanics Letters
Early online date8 Mar 2022
Publication statusPublished - Apr 2022

External IDs

Mendeley f3aa2615-5d51-3dd8-b690-9380fc1aaf8e
WOS 000806363800004


DFG Classification of Subject Areas according to Review Boards


  • Auxetic materials, Interpenetrating phase composites, Reentrant truss lattices, Reinforced concrete