Table 8.

Testing results of the supplementary specimens.

No.	Ultimate Load (kN)	Tensile Strength (MPa)	${\mathit{f}}_{\mathit{m}\mathit{s}\mathit{t}}^0/{\mathit{f}}_{\mathit{s}\mathit{t}\mathit{k}}$	Failure Type
S-RM1-1	121.75	605.54	1.12	P
S-RM1-2	121.66	605.09	1.12	P
S-RM1-3	120.93	601.46	1.11	P
S-RM2-1	120.63	599.97	1.11	P
S-RM2-2	123.67	615.09	1.14	P
S-RM2-3	121.87	606.14	1.12	P
S-RM3-1	121.93	606.44	1.12	P
S-RM3-2	121.57	604.65	1.12	P
S-RM3-3	121.11	602.36	1.12	P
S-RM4-1	92.37	600.32	1.11	P
S-RM4-2	92.39	600.47	1.11	P
S-RM4-3	94.28	612.75	1.13	P
S-RM5-1	152.91	601.21	1.11	P
S-RM5-2	154.51	607.48	1.11	P
S-RM5-3	154.35	606.88	1.12	P
S-RM6-1	121.45	604.05	1.12	P
S-RM6-2	121.04	602.01	1.11	P
S-RM6-3	121.48	604.20	1.12	P
S-RM7-1	120.64	600.02	1.11	P
S-RM7-2	121.13	602.46	1.12	P
S-RM7-3	121.27	603.15	1.12	P
S-RM8-1	121.87	606.14	1.12	P
S-RM8-2	121.84	606.00	1.12	P
S-RM8-3	121.46	604.10	1.12	P
S-RM9-1	66.12	-	0.61	N
S-RM9-2	44.77	-	0.41	N
S-RM9-3	50.12	-	0.46	N

Note: $f_{mst}^0$ represents the measured tensile strength of the specimen, while $f_{stk}$ represents the standard value for the ultimate tensile strength of the steel reinforcement. P refers to fracture failure of the prefabricated steel bar, and N refers to weld failure between the grouting sleeve and the post-retrofitted connecting steel bars.