PSI - Issue 64

A. Alecci et al. / Procedia Structural Integrity 64 (2024) 1951–1958 Alecci et al. / Structural Integrity Procedia 00 (2019) 000 – 000

1956

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terms of maximum load F max , tensile strength f r , Young’s modulus E, and maximum deformation ε r , are reported in Table 4. Table 4. Mechanical properties of the composite material . Coupon F max [N/mm 2 ] f r [N/mm 2 ] E [N/mm 2 ]  t Int_06-1 681 327 36310 0.01 Int_06-2 881 424 66577 0.01 Int_06-3 704 338 34718 0.02 Int_06-4 735 353 44960 0.01 Int_06-5 764 367 48250 0.02 Int_06-6 1059 509 52920 0.02 Average value 804 386 47289 0.015 4.3.1 SST- Single Shear Test The composite material consisting of basalt fibers and the different types of matrices studied in this work were subjected to single shear tests (SST) to evaluate adhesion properties. For each FRLM system, three specimens were tested and two different anchoring lengths, 100 mm and 220 mm, were considered for a total of 18 specimens. Each of them consists of a strip of composite material applied to one side of the brick. Specifically, the 95 mm wide basalt fabric was embedded in two layers of 5 mm thick mortar matrix. The bonded area on the brick was 220 mm long and 95 mm wide and positioned 30 mm from the top edge of the brick. After 28 days of curing, the specimens were tested using a universal press machine. It is equipped with specially designed steel plates that secure the specimen in the vertical position. To acquire the displacements, four transducers were applied to measure the sliding of the fiber, the global displacement and the brick displacement. The basalt fabric was positioned between two steel plates hinged to the load cell. The testing apparatus was equipped with a 5 kN load cell (type TRZ500, METIOR s.r.l.). The load was applied at a displacement rate of 0.4 mm/min. The results of the single shear tests in terms in terms of average values are reported in Table 5. Table 5. Results of the single shear test (standard deviation and coefficient of variation are reported in parentheses) . SST F max [N]  max [mm] S max [mm]  r [N/mm 2 ]  max [N/mm 2 ] K [N/mm]  c  cd 100-Int _01_1-3 634 (197; 31) 0.78 (0.24; 31) 1.12 (0.37; 33) 209 (65; 31) 0.0039 (0.0012; 31) 1345 (102; 8) 1.57 (0.41; 26) 2.06 (0.13; 6) 100-Int_05_1-3 313 (116; 37) 0.59 (0.18; 30) 0.49 (0.06;12) 103 (38; 37) 0.0030 (0.0009; 30) 630 (2.45; 0.4) 1.15 (0.19; 16) 1.07 (0.09; 8) 100-Int_06_1-3 723 (332; 46) 0.94 (0.69; 73) 1.23 (0.59; 48) 238 (109; 46) 0.0047 (0.0034; 73) 1808 (635; 35) 2.10 (0.78; 37) 1.72 (0.20; 11) 220-Int_01_1-3 1050 (65; 6) 1.14 (0.24; 21) 1.71 (1.19; 11) 346 (22; 6) 0.0058 (0.0012; 21) 1875 (326;17) 2.13 (0.62; 29) 1.51 (0.31; 21)

421 (40; 9)

0.95 (0.11; 11) 1.02 (0.45; 44) 2.84 (0.95; 33) 1.52 (0.41; 27)

1.15 (0.05; 5) 1.73 (0.44; 25) 4.57 (1.34; 29) 3.75 (0.89; 24)

139 (13; 9) 359 (44; 12) 675 (154; 23) 663 (140; 21)

0.0048 (0.0006; 11) 0.0051 (0.0023; 44) 0.0142 (0.0048; 33) 0.0076 (0.0020; 27)

1217 (795; 65) 2575 (387; 15) 2705 (149; 6) 2457 (217; 9)

1.98 (1.87; 63) 2.14 (0.43; 20) 3.90 (0.52; 13) 1.98 (0.20; 10)

1.12 (0.03; 3) 1.14 (0.02;1) 1.08 (0.2; 2) 1.20 (0.02; 2)

220-Int_05_1-3

1090 (134; 12) 2052 (469; 23) 2016 (424; 21)

220-Int_06_1-3

290-Int_01_1-3

290-Int_06_1-3