Concrete structures suffer from the corrosion of reinforcing steel-bars due to severe environ- of SF. The coefficient G represents the amount of Pantazopoulo & Mills 1995). It is reasonable to 1 ments, in particular, chloride attack. Acoustic Emission (AE) techniques…
Concrete structures suffer from the corrosion of reinforcing steel-bars due to severe environ- of SF. The coefficient G represents the amount of Pantazopoulo & Mills 1995). It is reasonable to 1 ments, in particular, chloride attack. Acoustic Emission (AE) techniques have been extensively applied to water per unit volume held in the gel pores at 100% assume that the evaporable water is a function of concrete and concrete structures. In order to identify the onset of corrosion and the nucleation of concrete relative humidity, and it can be expressed (Norling relative humidity, h, degree of hydration, α , and cracking due to expansion of corrosion products, continuous AE monitoring is available. These corrosion- c Mjornell 1997) as degree of silica fume reaction, α , i.e. w =w (h,α ,α ) s e e c s induced cracks in concrete are studied in an accelerated corrosion test, where kinematics of micro-cracks is = age-dependent sorption/desorption isotherm identified by SiGMA (Simplified Green’s functions for Moment tensor Analysis). Monitoring the corrosion c s (Norling Mjonell 1997). Under this assumption and () process of rebar by AE, it is confirmed that the onset of corrosion and the nucleation of corrosion-induced G αc,αs =k α c+k α s (5) by substituting Equation 1 into Equation 2 one 1 vg c vg s cracks in concrete are successfully identified. Then, generating mechanisms of corrosion-induced cracks are clarified by the SiGMA analysis. obtains c s where k and k are material parameters.