Issue 60

S. Ahmed et alii, Frattura ed Integrità Strutturale, 60 (2022) 243-264; DOI: 10.3221/IGF-ESIS.60.17

average load of 107.6 kN with a maximum average displacement for the screw was 31.2 mm, as shown in Fig. 18(b). In addition, the failure shape for normal concrete was confined to the existence of the plastic dowel from its position, as shown in Fig. 19. However, the failure shape for UHPC sleepers was a fracture in the concrete, as shown in Fig. 20.

Crack inspection at a load of 60 kN

Sleeper series

Number

Fracture load

SN

No.6 No.7 Avg. No.6 No.7 Avg.

No cracks No cracks

109 kN

116.3 kN 112.6 kN 106.6 kN 108.7 kN 107.6 kN

S0

No cracks No cracks

Table 8: Pull-out test result.

(a)

(b) Figure 18: Load versus screws exit distance pull-out test: (a) SN; (b) S0.

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