PSI - Issue 44

Giuseppe Bramato et al. / Procedia Structural Integrity 44 (2023) 2302–2309 Author name / Structural Integrity Procedia 00 (2022) 000–000

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(a) (c) Fig. 9. Failure mode: (a) typical FRCM coupon cracking pattern, (b) shear bond crisis type “A”, (c) shear bond crisis type “F”, (d) shear bond crisis type “C” In table 2 the experimental results are reported in terms of peak force ( F peak ), peak stress ( s peak ), global displacement ( s ) and failure mode ( FM ). The “s” represents the displacement of the mobile traverse of the texting machine. Table 2. Peak force ( F peak ), peak stress ( s peak ), global displacement ( s ) and failure mode ( FM ).. Label F peak [ kN ] s peak [ MPa ] s [ mm ] FM [ - ] PL_B_M_1 4921.88 1262.02 9.58 A PL_B_M_2 2775.16 711.58 7.12 F PL_B_M_3 5162.18 1323.64 8.97 C Mean 4286.41 1099.08 8.56 - CoV 30.66% 14.97% - C_B_M_1 3200.85 820.73 10.17 C C_B_M_2 4710.66 1207.86 10.73 C C_B_M_3 3769.70 966.59 8.54 C Mean 3893.74 998.39 9.81 - CoV 19.58% 11.59% - PL_B_R_1 3584.88 919.20 8.97 C PL_B_R_2 2632.54 675.01 6.00 C Mean 3108.71 797.11 7.49 - CoV 21.66% 28.06% - C_B_R_1 3367.22 863.39 5.94 C It was observed that, concerning the coupons realized with cementitious mortar, the results are more dispersed in C serie than PL-one, probably due to the different failure modes observed. The same analysis will be carried out on the series of samples made with lime mortar as soon as the tests, currently in progress, will finish. The data dispersion of all data is reasonable considering the kind of the tests (Lignola et al. (2017), Leone et al. (2017), Bilotta et al. (2017), Leone et al. (2020)). (b)

(a) (b) Fig. 10. Shear bond test results: (a) lime-based mortar, (b) cementitious mortar

As expected, the substrate did not influence the results since the most failure modes were happened at the matrix-fibre interface. Otherwise, the mechanical properties of the matrix influenced the experimental results similarly to that