PSI - Issue 70

R. Ashwathi et al. / Procedia Structural Integrity 70 (2025) 183–190

187

Table 5. Split Tensile Strength of concrete Specimen % added

7 Day (MPa)

14 Day (MPa)

28 Day (MPa)

7 Day (MPa)

14 Day (MPa)

28 Day (MPa)

Specimen

% added

CC

0

3.42 4.24 4.16 3.26 4.12

5.18 5.52 6.14 5.26 6.10

5.64 6.25 6.96 5.92 6.67

SFRC SFRC HFRC HFRC HFRC

0.5

4.48 4.14 3.16 4.68 4.12

7.02 6.68 5.66 5.14 5.24

7.64 7.12 5.92 6.58 6.14

PFRC PFRC PFRC SFRC

0.25

0.75

0.5

0.25 - 0.75

0.75 0.25

0.5 - 0.5

0.75 - 0.25

Fig. 2. Split Tensile Strength of concrete The percentage increase tends to range between 4.48%; 21.12% and 16.48%; 32.20% for PFRC and SFRC showing that presence of fibres enhances the tensile strength of concrete in Fig.2. The steel and polyester fibres incorporated in the ratio of 0.5-0.5 exhibits the highest performance among various mixes and decreases beyond it which may be due to insufficient bonding(Haripriya and Ganesh Naidu, 2023).

3.3 Flexural Strength:

When the fibres are used as a reinforcement in the matrix, it helps to control the propagation of cracks and aids in preventing the localized failure (Li Haitang; Zhen, Xuanjiao; Wen, Chengcheng; Chen, Gang, 2021). The flexural strength of the concrete are given in Table 6.

Table 6. Flexural Strength of concrete Specimen % added

7 Day (MPa)

14 Day (MPa)

28 Day (MPa)

7 Day (MPa)

14 Day (MPa)

28 Day (MPa)

Specimen

% added

CC

0

1.50 1.66 1.84 1.42 1.64

2.17 2.22 2.48 2.12 2.02

2.30 2.62 2.82 2.48 2.38

SFRC SFRC HFRC HFRC HFRC

0.5

1.72 1.54 2.48 2.86 2.64

2.44 2.12 3.32 3.16 3.64

2.86 2.42 3.86 4.14 4.02

PFRC PFRC PFRC SFRC

0.25

0.75

0.5

0.25 - 0.75

0.75 0.25

0.5 - 0.5

0.75 - 0.25