Mechanical behavior of textile-reinforced mortar subjected to fire
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Κορδά, Ελένη
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Abstract
Textile Reinforced Mortar (TRM) has been widely used for strengthening purposes in the past years. It seems to be a very promising structural material as well since its small thickness and light weight can fulfill a variety of architectural purposes. A considerable amount of research has been conducted to determine the properties of this composite material under normal environmental conditions, but there is a significant knowledge gap regarding its performance at elevated temperatures. The scope of this thesis is to provide an experimental study on the residual properties of these composites after they have been subjected to fire. The tensile and flexural behavior of various TRM layups is determined at ambient and high-temperature conditions. The residual performance of the cementitious matrix is also examined. Finally, an analytical approach regarding the tensile stress-strain response of the ambient and heated elements as proposed by Aveston, Cooper, and Kelly (Aveston et al., 1973) is presented. The analytical model is later compared to the experimental results. For this experimental campaign, approximately 200 TRM specimens were manufactured and tested in ambient and high-temperature conditions. More than 80 specimens were manufactured and tested in tension and 90 specimens in flexure. Additionally, about 40 mortar prisms were manufactured and tested in compression and 3-point bending. Some textile specimens were also prepared and tested in tension as well. Various parameters were investigated to get a better understanding of the TRM properties, such as fiber volume fraction, temperature exposure (up to 712oC), type of textile (carbon and glass fiber textiles), mortar cover, and type of coating. For this purpose, various specimens were manufactured which consisted of different types and number of textiles, such as carbon, AR-glass, or a combination of both, two different types of coatings and two mortar cover thicknesses. This study provides valuable results on the degradation of these composites after being subjected to fire.
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Textile Reinforced Mortar (TRM), High temperatures, Bending, Tension, Carbon fibers, Glass fibers