Mechanical, electrical and microstructural properties of cement-based materials in conditions of current flow

摘要: Corrosion in reinforced concrete structures is not only induced by the penetration of aggressive substances (e.g. chlorides and/or CO2) but also influenced stray currents. Further, degradation mechanisms cement-based systems due to combined effect current and chloride have been a serious problem civil engineering for many years. In case when exposed above factors long-term periods, service life will be reduced. With respect effects current, magnitude corrosion damage directly related density at point departure time over which flows. The higher density, greater resultant structure. High levels DC would dramatically decrease mechanical properties, could parallel increased diffusivity decreased threshold concentration with initiation. Stray currents therefore produce microstructural alterations, resulting from modified electrical properties bulk matrix, turn influence resistance properties. This work reports on flowing through mortar specimens, matrix investigation presents comparative study compressive strength), resistivity microstructure (porosity, pore size distribution) under compared rest (no current) conditions. Additionally, numerical simulation distribution performed, meant serve as basis further elaborated modeling level that exert significant alterations matrix.