Experimental Studies on Bond Performance of BFRP Bars Reinforced Coral Aggregate Concrete

International Journal of Concrete Structures and Materials

Table 6 Partial test results.

Test piece number	Nominal diameter/mm	Bond length/mm	Design strength of coral concrete/MPa	F_max/kN	S_max/mm	τ_max/MPa	Failure modes
B6-5d-C30	6	5d	C30	8.60	1.88	15.21	P
B8-5d-C30	8	5d	C30	15.10	1.66	15.03	P
B10-5d-C30	10	5d	C30	22.73	1.46	14.48	P
B10-10d-C30	10	10d	C30	41.25	1.40	13.14	P
B10-12d-C30	10	12d	C30	47.75	0.78	12.67	F
B12-5d-C30	12	5d	C30	32.10	2.84	14.20	P
B16-5d-C30	16	5d	C30	53.95	1.63	13.42	S
B20-5d-C30	20	5d	C30	66.05	2.39	10.52	S
B10-10d-C20	10	10d	C20	31.80	1.73	10.13	P
B10-10d-C15	10	10d	C15	26.25	1.46	8.36	P

The meaning of each symbol in the table: “d” denotes the diameter of BFRP rebar, “F_max” denotes the ultimate bonding force; “S_max” denotes the amount of slip of the BFRP rebar when the maximum pulling force is reached; “τ_max”denotes Average bond stress at maximum pull force; Destructional forms: “P” denotes pull-out failure, “F” denotes fracture failure, “S” denotes splitting failure. The data listed in the table are represented by the results of the three specimens in each group with its closest to the average value of their maximum drawing force.