By J.L. Clarke
Metal has generally been included into concrete constructions to beat its restricted tensile energy. Corrosion of the metal reinforcement or prestressing procedure is an incredible challenge, rather in competitive environments, with critical implications for the integrity and sturdiness of the concrete constitution. some of the most promising ways to this challenge contains alternative of the metal with man-made fibres. during this ebook, a world panel of authors presents an authoritative evaluate of the topic, bringing jointly all elements of the improvement of other reinforcing fabrics, and describing their houses and all over the world purposes. Civil and structural engineers fascinated with concrete layout and building, fabrics researchers and complicated scholars will locate this booklet a entire, up to date and necessary resource of reference.
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Extra resources for Alternative Materials for the Reinforcement and Prestressing of Concrete
Many composites have good to excellent properties at elevated temperatures. Most composites do not start to burn easily. The effect of the high temperature is more severe on the resin matrix than the fiber. Resins contain large amounts of carbon, nitrogen and hydrogen which are flammable and research is continuing on the development of more fire-resistant resins . 5 h of exposure to a temperature of 300°C, the bars can maintain 85% of their room-temperature strength . While this performance is better than that of prestressing steel, the decrease in strength increases at higher temperatures and approaches that of steel.
1 Introduction Stainless steel is the name given to a family of corrosion resistant steels containing a minimum of 12% chromium. On contact with air, the chromium forms a thin oxide layer on the surface of the steel. This is passive and resists corrosion. The addition of other elements such as nickel and molybdenum enhances the passivity and thus improves the corrosion resistance. As the oxide layer is formed by the elements in the stainless steel, rather than being an applied coating, it is in fact selfrepairing.
Studies conducted by Wu report a compressive strength ranging from 320 to 470 MPa for rebars having a tensile strength in the range of 550–900 MPa . Higher compressive strengths are expected for bars with higher tensile strength. 4 Compressive modulus of elasticity Unlike the tensile stiffness, the compressive stiffness of GFRP rebars varies with rebar size, type, quality control in manufacturing and the length to diameter ratio GLASS-FIBER REINFORCING BARS 41 of the specimens. The compressive stiffness for GFRP rebars is smaller than the tensile modulus of elasticity.
Alternative Materials for the Reinforcement and Prestressing of Concrete by J.L. Clarke