engleski

Effect of chemical admixtures on corrosion behaviour of structural steel in mortar: comparison between standardized and alternative method

Nowadays, corrosion of steel rebars is the most destructive durability issue in RCC structure. There are number of reasons behind this issue including chloride ingress and carbonation. In this study, the effect of two different type of admixtures (set retarder and water repellent) on corrosion resistance of steel in mortar system was investigated by method standardized in EN 480 -14. In order to know the efficiency of standard procedure, another set of specimens were casted and assessed by an alternative corrosion detection method. All the specimens were exposed to 3.5% NaCl and saturated Ca(OH)2 solution and the corrosion activity monitored regularly. In standard method, corrosion activity was evaluated by measuring the maximum current density values during potentiostatic polarization. After detection of the corrosion, specimens were opened and checked to confirm the corrosion by visual observation. In the alternative method, corrosion was monitored for a specific period by linear polarization method.

admixtures, corrosion, mortar, maximum corrosion current density, linear polarization method

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