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Composite Rods as a Steel Substitute in Concrete Reinforcement - aashish - 10-04-2017 Composite Rods as a Steel Substitute in Concrete Reinforcement [attachment=17424] Introduction The concrete construction industry is dealing with a very significant challenge regarding the deterioration of structures. Nowadays a large number of bridges, buildings and other structural elements require rehabilitation and repair and its maintenance have become an increasingly serious problem. Once subjected to repeated loading and to aggressive environmental agents, concrete structures present a decrease of mechanical properties and of durability performance, being the corrosion of steel one of its most serious problems. Objective of the research work, experimental work and results obtained The current research work deals with the development of braided reinforced composite rods for civil engineering applications, namely to reinforce concrete structures as a substitute of steel rebars. The mechanical properties of FRP rods, produced by braiding, are influenced by the type of fibre used as braided fabric core reinforcement, among other parameters. The objective of this experimental work is to evaluate the influence of the type of core reinforcement fibres on the mechanical performance of braided reinforced composite rods. Several samples of braided reinforced composite rods were produced using polyester fibres, for the production of braided fabrics, E-glass, carbon and HT polyethylene fibres, as braided fabrics core reinforcement, and polyester resin as polymeric matrix. Braided reinforced composite rods have been produced on a vertical braiding machine with an incorporated impregnation system. Braided reinforced composite rod tensile performance ranking In order to identify which is the braided reinforced composite rod that presents the most interesting tensile performance, a classification criterion was defined. Thus, was established a score from 1 to 7, namely, for the best and worth tensile performance in each parameter evaluated (Table 3). Therefore, the composite rod that presents tensile performance according to the objectives envisaged is the one that presents the smallest total score. The composite rod that presents the highest total score value is the one which tensile performance is less interesting, among the composite rods produced. |