PSI - Issue 44

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

2307

6

ultimate tensile strength (coefficient of exploitation) was to 0.43 and 0.85 in case of lime-based and cementitious mortar, respectively.

Fig. 7. FRCM stress-strain average curves: lime-based mortar vs cementitious mortar The crisis in specimens was caused by some yarns break due the cracking of mortar who generated an uneven distribution of the tensile stress Cascardi et al (2018). Even in this case, the mechanical properties of the matrix influenced the cracking pattern. However, the analysis of the failure mode of coupons is still in progress ant it will be able to better correlate the mode of failure and the coefficient of exploration. 4.2. Single face shear test In the following, the results of 9 single lap shear bond test are reported. In Fig. 8 the data obtained are illustrated in terms of stress-displacement relationship considering separately each analyzed parameters. The stress was calculated like the ratio between force and cross section area of the fibre.

1000 1200 1400

1000 1200 1400

σ [ MPa ]

σ [ MPa ]

0 200 400 600 800

0 200 400 600 800

PL_B_M_1

PL_B_R_1 PL_B_R_2

PL_B_M_3

PL_B_M_2

0

2

4

6

8

10

12

14

0

2

4

6

8

10

12

14

(a)

(b)

Displacement [ mm ]

Displacement [ mm ]

1000 1200 1400

1000 1200 1400

σ [ MPa ]

σ [ MPa ]

0 200 400 600 800

0 200 400 600 800

C_B_M_1 C_B_M_2 C_B_M_3

C_B_R_1

0

2

4

6

8

10

12

14

0

2

4

6

8

10

12

14

(c) (d) Fig. 8. Shear bond specimens displacement-stress curves: (a) PL_B_M serie, (b) PL_B_R serie, (c) C_B_M serie, (d) C_B_R serie The shear bond experimental curves (Figure 8) are characterized by a pseudo linear trend in case of crisis occurred at the reinforcement-substrate interface (type “A”, PL_B_M1 in the Fig. 10a), while a pre-peak trend (pseudo linear) and a post-peak trend softening was observed in case of crisis at matrix-fibre interface (type “C”). The failure mode observed is classified according to dei Lavori Pubblici, C. S. (2018). Displacement [ mm ] Displacement [ mm ]