PSI - Issue 62

Federico Laino et al. / Procedia Structural Integrity 62 (2024) 983–989 Barile S., Laino F., Muzzupappa E./ Structural Integrity Procedia 00 (2019) 000 – 000

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application of the repairing mortar is able to stabilize cracking openings and avoid unexpected cracks in the longitudinal direction of the beam as detected in the bottom surface of B1_REF; • In the cases of higher corrosion levels, the restoration of the damaged concrete cover with the mortar would seem to be able to induce a positive multi-cracking stage under cyclic loads at increasing deflection amplitudes. Higher is the number of cracks, the minor will be their openings.

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Fatigue Test - Maximum Crack opening comparison Crack opening, measured by digital microscope

B1 (Ref) - Crack n.1 B2 (8%) - Crack n.1 B3 (6%) - Crack n.1 B4 (3%) - Crack n.3

Crack opening [mm]

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Figure 5 - Crack opening vs Load Comparison

Figure 5 shows the trend of the first crack opening in function of the applied load. Comparing unrepaired reference B1_R beams and restored B4, having the same corrosion level, the same crack opening occurs for higher load values for the restored beam. Analysing the behaviour also of the B2 beam having a corrosion level of 6%, double that of the reference beam, the crack opening trend is similar to that of the reference beam despite having a significantly higher corrosion level.

Figure 6: Spray application of the mortar, by plastering machine equipped with premixer.