PSI - Issue 33

Francesco Freddi et al. / Procedia Structural Integrity 33 (2021) 371–384 Author name / Structural Integrity Procedia 00 (2019) 000–000

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Fig. 4 Domain used for the validation of the corrosion model

The corrosion model provides results in good agreement with the experiments provided in (Medagoda Arachchige, 2008), in fact the corrosion current density for the passivated steel rebar equal to 0.097 μA/cm 2 , increasing to a stable value of 0.98 μA/cm 2 once the carbonation front reaches the steel rebar. 3.2. Double side diffusion test The full carbonation corrosion cracking process is investigated. The test considers an ordinary portland concrete square specimen of side L = 76 mm with a 16 mm steel rebar placed in the center. The w/c ratio has been set to 50% with 60% relative humidity. A 0.036% CO 2 external concentration is set on the left and bottom side of the domain. The corrosion parameters are reported in Table 2 whereas the material parameters are listed in Table 3. Vertical and horizontal displacements are blocked on the top side and on the right side of the domain respectively. The simulated time is 20 years.

Fig. 5 Double side diffusion test domain