Table 6: Failure mode of specimen and test data of bond strength and slip.
Specimen group no. |
Failure mode |
sf,u (mm) |
sl,u (mm) |
τu (MPa) |
test value |
mean |
test value |
mean |
test value |
mean |
5dC30 |
CS/CS/CS |
2.01/1.34/1.29 |
1.32 |
1.96/1.66/1.90 |
1.78 |
15.35/16.28/18.49 |
17.38 |
5dC40 |
CS/CS/CS |
0.94/0.57/0.59 |
0.58 |
1.67/1.27/1.29 |
1.28 |
21.63/21.59/20.68 |
21.13 |
5dC50 |
CS/CS/CS |
0.61/0.56/0.31 |
0.56 |
1.15/1.63/0.82 |
1.63 |
20.43/21.23/21.68 |
21.23 |
5dC30R |
PO/PO/PO |
0.87/1.34/1.55 |
1.34 |
1.23/1.95/2.03 |
1.95 |
15.31/16.55/17.46 |
17.00 |
5dC40R |
PO/PO/PO |
0.64/0.33/0.21 |
0.33 |
0.90/1.23/1.23 |
1.23 |
21.89/20.35/19.88 |
20.35 |
5dC50R |
PO/PO/PO |
0.59/0.05/0.48 |
0.54 |
1.23/1.41/0.95 |
1.09 |
21.95/21.89/21.06 |
21.56 |
8dC30 |
CSA/CSA/CSA |
0.21/0.26/0.24 |
0.24 |
1.43/1.36/0.99 |
1.26 |
12.54/12.43/12.36 |
12.44 |
8dC40 |
CS/CSA |
0.19/0.28 |
0.24 |
1.62/1.36 |
1.49 |
11.41/15.05 |
13.23 |
8dC50 |
CSA/CS |
0.17/0.21 |
0.19 |
1.51/1.23 |
1.37 |
14.73/11.24 |
12.99 |
8dC30R |
PO/PO/PO |
1.29/0.50/0.45 |
0.75 |
1.39/0.94/0.82 |
1.05 |
12.14/12.64/12.11 |
12.30 |
8dC40R |
PO/PO/PO |
0.35/1.29/1.41 |
1.01 |
1.36/1.23/1.98 |
1.52 |
15.16/13.18/16.22 |
14.85 |
8dC50R |
PO/PO/PO |
1.41/0.75/1.39 |
1.18 |
1.57/0.97/1.18 |
1.24 |
13.10/13.05/13.92 |
13.35 |
10dC30 |
CS/CS |
0.17/0.14 |
0.16 |
1.83/0.89 |
1.36 |
10.90/12.39 |
11.65 |
10dC40 |
CS/CS/CS |
0.33/0.33/0.33 |
0.33 |
0.73/0.96/1.51 |
1.07 |
10.81/10.89/11.66 |
11.12 |
10dC30R |
PO |
0.77 |
0.77 |
1.34 |
1.34 |
11.89 |
11.89 |
Note: CS- concrete splitting, PO-pull out, CSA-concrete splitting after yield of steel-bar