Download Alternative Materials for the Reinforcement and Prestressing by J.L. Clarke PDF
By J.L. Clarke
Metal has characteristically been included into concrete constructions to beat its restricted tensile energy. Corrosion of the metal reinforcement or prestressing approach is a big challenge, quite in competitive environments, with severe implications for the integrity and sturdiness of the concrete constitution. probably the most promising ways to this challenge comprises alternative of the metal with man-made fibres. during this e-book, a global panel of authors offers an authoritative evaluate of the topic, bringing jointly all features of the advance of different reinforcing fabrics, and describing their houses and world wide purposes. Civil and structural engineers fascinated by concrete layout and development, fabrics researchers and complex scholars will locate this ebook a complete, up to date and useful resource of reference.
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Extra info for Alternative Materials for the Reinforcement and Prestressing of Concrete
The load capacity for the coated bars was found to be about 20% less than for uncoated bars, a similar difference to that at ambient conditions. In other words, the coating would have no effect on the safety of a structure in a fire. 8 Post fabrication coating One of the criteria for the choice of a suitable material and coating thickness is its ability to remain bonded to the reinforcement when the bar is bent. A thicker, less flexible coating may be more suitable from the point of view of long-term durability.
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. Thus, if damage does occur during handling and fixing, the passive oxide layer rapidly reforms and the corrosion resistance is not affected. A range of stainless steels with different mechanical properties and degrees of corrosion resistance are available.
However, it does require special attention in applications of GFRP as prestressing tendons. It must be noted that other factors such as moisture also impair creep performance and may result in shorter endurance time. 2 Fatigue. Composites reinforced with long fibers exhibit good fatigue resistance. Most of the research in this regard has been on high performance fibers, such as graphite, which are subjected to large cycles of loading in aerospace applications. In tests where the loading was repeated for 10 million cycles, it was concluded that graphite-epoxy composites have better fatigue strength than steel, while the fatigue strength of glass composites is lower than steel .