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In the last years the use of textile reinforced concrete (TRC) has grown considerably. Several types of fibers can be used in the form of textiles. Carbon fabrics have become an interesting reinforcement for TRC due to their excellent mechanical properties. However, the bond between carbon textile and cementitious matrix is not elevated. There are methods that can modify the textile-matrix bond, improving the mechanical behavior of the composite. In this paper the mechanical behavior of carbon textile reinforced concretes under tensile loading is discussed. Two types of carbon fabrics were studied: a flexible and a rigid one. The influence of the use of a coating made with an epoxy resin and sand in the response of the composite was investigated. Various stages of loading corresponding to initiation, propagation, distribution, opening, and localization of a crack system in the specimen were discussed. Pull-out tests were performed in textile’s yarns to characterize and compare the interface between the two types of carbon reinforcement and the cementitious matrix. The results obtained showed that the TRC with rigid carbon fabric achieved superior mechanical response under tensile loading. The addition of the coating made with an epoxy resin and sand was able to improve the tensile mechanical response of these composites, suggesting an enhancement in the bond between the fabric and the matrix. This improvement was more significant in the TRC with the flexible carbon fabric.

MECHANICAL AND BOND BEHAVIOR OF CARBON TEXTILE REINFORCED CONCRETES UNDER TENSILE LOADING