Abstract
Limited research has focused on the effect of high temperatures on the textile-reinforced mortar (TRM)-to-masonry bond. In this study, masonry prisms that were furnished with double-layered TRM strips were tested under shear bond conditions after their exposure to 200 °C and 400 °C for 1 h using the single-lap/single-prism setup. A total of four TRM systems were applied sharing the same type of textile –a dry AR glass fiber one– and different matrices: two cementitious matrices, namely a normal-weight (TRCNM) and a lightweight (TRCLM) one, and two counterpart alkali-activated matrices (TRAANM and TRAALM) based on metakaolin and fly ash. Specimens’ exposure to elevated temperatures did not alter their failure mode which was due to the sleeve fibers’ rupture along with core fibers’ slippage from the mortar. The residual bond capacity of the TRM systems decreases almost linearly with increasing exposure temperature. The alkali-activated textile reinforced mortars outperformed their cement-based counterparts in terms of bond strength at every temperature. All systems retained close to 50% of their original shear bond strength after heating at 400 °C. Per the type of binder, lightweight matrices resulted in either comparable (cement-based systems) or better (alkali-activated systems) heat protection at the TRM/masonry interface.
Highlights
Textile reinforced mortar (TRM) is an innovative composite material that has been developed over the last 15 years and is suitable for the strengthening of existing structures.It consists of a fibrous mesh that is sandwiched between layers of an inorganic matrix and is applied as an external reinforcement on masonry or concrete substrates in the form of single or multiple overlays
The effect of elevated temperatures on the residual shear bond strength of four TRM systems that were applied as external reinforcement on masonry elements is experimentally investigated
The TRM systems shared the same dry AR glass fiber textile that was combined with four different types of matrices: based
Summary
Textile reinforced mortar (TRM) is an innovative composite material that has been developed over the last 15 years and is suitable for the strengthening of existing structures. It consists of a fibrous mesh that is sandwiched between layers of an inorganic matrix and is applied as an external reinforcement on masonry or concrete substrates in the form of single (one textile) or multiple (up to four textiles) overlays. The TRM strengthening technique has already been adopted for both masonry and concrete structure rehabilitation schemes, [1]. This composite material is an interesting strengthening option, especially for masonry structures, since it is characterized by a high strength-to-weight ratio, offers vapor permeability of the substrate, and can be applied under low temperature and/or high humidity conditions. The reversibility of TRM and its compatibility with various substrate materials through the use of appropriate matrices render this technique an attractive strengthening solution for monumental structures as well
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