Influence of different charges in cement-based matrix of textile-reinforced concrete (TRC) on its thermomechanical and thermal behaviours at different temperatures

The aim of this study is to develop a composite material TRC with an aluminous matrix that can improve its
resistance to fire. The studied TRC composites were made with two layers of carbon grid integrated in a filled matrix. Two
types of filled aluminous cement were tested under thermal and mechanical loadings. The first matrix was aluminous cement
filled with alkali resistant chopped strand mat (MatAR) and the second one was an aluminous mortar filled with
polypropylene fibres (PPS). When the target temperature varies from 25°C to 120°C, the ultimate stress of the TRC with
polypropylene (TRC-PPS) is higher than that of the TRC with mat AR (TRC-MatAR). On the other hand between 120 ° C and
400 ° C, the ultimate stress of the TRC-PPS decreases approximately 80% while that of the TRC-MatAR significantly
evolves. At the end the mechanical resistance of both TRCs when the temperature is around 600 ° C. A thermomechanical
analysis (TMA) and a measurement of the thermal diffusivity complete the characterization of the materials as a function of
the temperature and relate the effect of the temperature on the microstructure and on global thermomechanical behaviour of
the TRC composites.