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Abstract
In this paper, the thermomechanical behaviour of two glass textile-reinforced concretes (TRCs), with temperature levels ranging from 25 °C to 672 °C, was firstly characterised, compared and analysed. Each TRC had three layers of alkali-resistant glass grid but a different cementitious matrix (one with normal mortar and the other refractory mortar). The first novelty and achievement of this study, compared to existing studies in the literature, is that the size of particles within the cementitious matrix of TRC has a very important effect on the ultimate stress and the post-cracked composite stiffness of TRC under thermomechanical condition. The resistance of TRC with normal mortar is greater than that of the TRC with fire mortar because the size of particles within the cementitious matrix is finer for the normal mortar. The second novelty and achievement of this study is that the fire mortar, with refractory property, leads to greater thermal and mechanical stability of TRC when it is simultaneously subjected to a tensile pre-loading and exposed to increasing elevated temperature. The third novelty and achievement of this study is that the evolution of thermomechanical behaviour of the two TRCs before 300 °C has been experimentally justified and analyzed thanks to physical, chemical and thermal characterization that has been carried out on crushed hardened cementitious matrix or on small TRC specimens. Between 25 °C and 110 °C, the decrease of the ultimate stress and the post-cracked composite stiffness of TRC corresponds to dehydration of components of cementitious matrix. However, between 110 °C and 300 °C, with water molecules released, hydration of anhydrous particles of the cementitious matrix (mortar) occurs, a gain in the ultimate stress and the cracked-composite stiffness of glass TRC consequently occurs.
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