Evaluación del comportamiento frente a la corrosión bajo tensión de armaduras de acero inoxidable dúplex 2205 y lean dúplex 2001 en solución simulada de poros de hormigón con cloruros

Abstract

The present PhD Thesis work focus attention on the study and evaluation of the suitable use of new lean duplex stainless steel (SS) in reinforced concrete structures exposed to marine environment and under tensional states, the Stress Corrosion Cracking behaviour of SS. For this purpose, a comparative study between two types of SS subjected to design-loads in a chloride contained simulated concrete pore solution has been carried out. The materials studied are AISI 2205 duplex SS and AISI 2001 lean duplex SS.Reinforcements were subjected to loads equivalent to 85% of their yield strength and 8% chloride contained environment. At the same time, electrochemical measurements have been made in reinforced beams with different steel grades, austenitic SS, AISI 304, two lean duplex SS, AISI 2001 and AISI 2304 and B500SD carbon steel. In this particular case, chlorides were added during the mixing of the concrete, using a 0,4% for carbon steel and 4% for SS. Tensional states have been applied under flexural condition. Finally, an economic analysis of the use of SS in a reinforced concrete bridge has been evaluated.