Effect of High Temperatures on the TRM-to-Masonry Bond

Abstract

This work is devoted to the experimental assessment of the Textile Reinforced Mortar (TRM)-to-masonry residual bond characteristics as a function of temperature. For this purpose, shear bond tests on single-lap/single-prism specimens were conducted after their exposure at different temperature levels, namely at 100°C, 200°C and 300°C. Specimens consisted of a strip of cementitious mortar reinforced with an uncoated alkali-resistant (AR) glass fiber textile unilaterally bonded on a fired clay brick masonry wallette (prism). For each heating event, a sharp temperature rise rate was opted for the achievement of the target temperature at which the specimens remained for one hour. Reference specimens were also tested at ambient conditions (20°C). Tests were carried out by varying both bond lengths and exposing temperatures. Two specimens were tested for each combination of bond length and exposing temperature. Material characterization tests were also carried out at each temperature level including ambient. The experimental results provide valuable insight on the degradation of the TRM-to-masonry bond capacity following a heating event and on the related failure modes.