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International Journal of Concrete Structures and Materials

Table 7 Test results of beam-end specimens

From: Realistic Evaluation of Reinforcement Bond Strength in Alkali-Activated Slag Concrete Exposed to Elevated Temperature

Ser

Code

\(\tau_{u}\) (MPa)

Su (mm)

\(\sigma_{u} /f_{u}\) (%)

Ka (N/mm3)

Failure mode

1

D12-T25-4

15.01

0.2111

37.30

71.10

Splitting

2

D12-T300-6

13.46

0.4491

50.15

29.97

 

3

D12-T600-8

10.53

0.7030

52.30

14.98

 

4

D16-T25-8

15.56

0.1603

72.17

97.07

 

5

D16-T300-4

10.97

0.5745

25.44

19.09

 

6

D16-T600-6

8.54

0.8550

29.70

9.99

 

7

D22-T25-6

14.01

0.3570

45.13

39.24

 

8

D22-T300-8

11.29

0.5709

48.49

19.78

 

9

D22-T600-4

6.98

1.1145

14.99

6.26

 
  1. \(\tau_{u}\) = the ultimate bond strength (\(\tau_{u} = \frac{{P_{u} }}{\pi \emptyset L}\)); Su = free-end slippage that is corresponding to the obtained ultimate bond strength; \(\sigma_{u}\) = tensile stress in the tested steel rebar that is corresponding to the obtained ultimate bond strength (\(\sigma_{u} = \frac{{P_{u} }}{{\pi \emptyset ^{2} /4}}\)); \(f_{u}\) = maximum tensile strength of the tested steel rebar; Ka = the ascending branch slope of bond stress–slip curve (Ka = τu/Su).
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