PSI - Issue 70

Maheshwari Sonker et al. / Procedia Structural Integrity 70 (2025) 477–484

481

3.11E-03

M65

2.71E-03

baselinestate CUT-1_6mm CUT-2-6mm CUT-1_8mm CUT-2-8mm CUT-1_12mm CUT-2-12mm

2.31E-03

Conductance G

1.91E-03

1.51E-03

180000

200000

220000

240000

260000

280000

Frequency (Hz)

Fig. 3. Variation of conductance with frequency for different damage depths in M60 and M65 concrete grades. The conductance versus frequency signatures were recorded to monitor shifts in the resonance peak, with leftward shift indicating increasing damage severity. In Fig. 3 displays curves representing different damage states: "baseline state," "CUT-1_6mm," "CUT-2_6mm," "CUT-1_8mm," "CUT-2_8mm," "CUT-1_12mm," and "CUT-2_12mm," corresponding to varying damage depths severity within the concrete.

4. Results And Discussion

The RMSD was calculated between baseline and damaged impedance signatures. An increase in RMSD correlated with crack propagation. Damage quantification were performed by calculating RMSD, CC, MAPD between healthy and progressively damaged states (see Fig. 4). As damage severity increases, the RMSD, MAPD, and CC values show an upward trend, indicating greater severity. This shows that deeper damage leads to more significant deviations from the baseline, confirming the link between damage depth and conductance signature shifts as shown in Fig. 4. thereby validating the sensitivity of the EMI technique to varying damage severities in composite fibre concrete.

10

M60

RMSD MAPD CC (Correlation Coefficient)

8

6

%

4

2

0

1_6 mm 2-6 mm 1_8 mm 2-8 mm 1_12 mm 2-12 mm

Depth of damages