Bond Behavior of CRACFST Columns after Exposure to Elevated Temperatures

Table 1

Summary of test specimens and results.

No.	D × ts × Le (mm)	T (°C)	t (min)	r (%)	Concrete type	Le/D	τu (MPa)	Su (mm)
C1	114 × 3 × 410	600	120	0	C30	3.6	1.28	1.35
C2	114 × 3 × 410	600	120	50	C30	3.6	1.32	1.37
C3	114 × 3 × 410	600	120	100	C30	3.6	1.51	1.23
C4	114 × 3 × 410	600	120	0	C40	3.6	1.44	1.35
C5	114 × 3 × 410	600	120	50	C40	3.6	1.61	1.21
C6	114 × 3 × 410	600	120	100	C40	3.6	1.69	1.29
C7	114 × 3 × 260	600	120	0	C30	2.3	1.41	1.77
C8	114 × 3 × 260	600	120	50	C30	2.3	1.45	1.59
C9	114 × 3 × 260	600	120	100	C30	2.3	1.66	1.44
C10	114 × 3 × 260	20	0	0	C30	2.3	0.61	1.24
C11	114 × 3 × 260	200	120	0	C30	2.3	0.88	1.58
C12	114 × 3 × 260	400	120	0	C30	2.3	1.25	2.07
C13	114 × 3 × 260	800	120	0	C30	2.3	1.84	3.83
C14	114 × 3 × 260	20	0	50	C30	2.3	0.62	0.95
C15	114 × 3 × 260	200	120	50	C30	2.3	0.89	2.12
C16	114 × 3 × 260	400	120	50	C30	2.3	1.32	2.01
C17	114 × 3 × 260	800	120	50	C30	2.3	2.07	3.79
C18	114 × 3 × 260	20	0	100	C30	2.3	0.65	1.25
C19	114 × 3 × 260	200	120	100	C30	2.3	0.95	1.40
C20	114 × 3 × 260	400	120	100	C30	2.3	1.41	2.63
C21	114 × 3 × 260	800	120	100	C30	2.3	2.37	2.75
C22	114 × 3 × 260	600	30	0	C30	2.3	1.04	0.67
C23	114 × 3 × 260	600	60	0	C30	2.3	1.18	0.97
C24	114 × 3 × 260	600	30	50	C30	2.3	1.14	0.72
C25	114 × 3 × 260	600	60	50	C30	2.3	1.42	1.17
C26	114 × 3 × 260	600	30	100	C30	2.3	1.25	1.55
C27	114 × 3 × 260	600	60	100	C30	2.3	1.61	1.39