Publication Details
Nicolas Ospitia, Ali Pourkazemi, Eleni Tsangouri, Johan Stiens, Angelis, Dimitrios

International Conference on Regeneration and Conservation of Structures (ICRCS 2022)

Contribution To Book Anthology


Textile Reinforced Cementitious (TRC) sandwich composites consist of two thin TRC facings and a thick insulating core. The thickness of the insulation, that separates the TRC facings, increases the moment of inertia of the composite, benefiting the bending stiffness and loadbearing capacity. However, due to its composite nature, the fracture under service loads is very complex, where a weak interlaminar bond may reduce substantially the performance of the composite. For this reason, monitoring the fracture process of TRC structural elements is essential for the prediction of their service life. Non-Destructive Testing (NDT) techniques allow monitoring the fracture behavior and predict the failure mode from low load conditions. In this study Acoustic Emission (AE), Digital Image Correlation (DIC), and Millimeter-Wave (MMW) Spectroscopy are used to monitor four-point-bending tests of TRC sandwich samples. DIC allows to monitor and measure the surface strain, while AE enables localization and characterization of internal cracking, and MMW detects discontinuities due to defects such as cracking and delamination. Additionally, the interlaminar bond between the TRC facing under tension and the insulating core is artificially weakened in some specimens and tested under the same conditions to show the influence of the bond on the loadbearing behavior of the composite.