Advances in Civil Engineering

Research Article

Experimental Study on Mechanical Properties of CFRP-Confined Concrete Columns under Continuous Semi-Submergence of Sulfate

Table 6

Strength variation of deteriorated concrete confined by CFRP under two stages.


Specimen number	F (kN)	f_cut’ (MPa)	f_cut’, m (MPa)	ε_cut (×10⁻⁶)	ε_l (×10⁻⁶)	ε_cut/ε_cu0	R (%)	R_m (%)

CA0-1	1,762.61	99.79	101.27	15,403	11,205	5.62	—	100
CA0-2	1,840.62	104.21		15,007	10,567	5.47
CA0-3	1,762.61	99.79		14,982	10,589	5.46

CAH60-1	1,876.30	106.23	106.48	16,032	14,302	5.85	104.90	105.15
CAH60-2	1,885.22	106.74	106.48	15,543	13,908	5.67	105.40	105.15

CAH90-1	1,892.09	107.12	106.74	17,890	15,509	6.53	105.78	105.4
CAH90-2	1,878.43	106.35	106.74	18,032	15,231	6.58	105.02	105.4

CAH120-1	1,842.87	104.34	104.05	15,602	11,708	5.69	103.03	102.745
CAH120-2	1,832.62	103.76	104.05	15,409	12,032	5.62	102.46	102.745

CAH180-1	1,842.14	104.30	102.18	14,992	12,389	5.47	102.99	100.9
CAH180-2	1,767.22	100.06	102.18	15,202	11,809	5.55	98.81	100.9

CAH240-1	1,728.75	97.88	98.76	13,202	9,911	4.82	96.65	97.52
CAH240-2	1,759.88	99.64	98.76	14,283	8,901	5.21	98.39	97.52

Note. F is the ultimate bearing capacity, f_cut’ is the compressive strength of specimens, f_cut’, m is the average compressive strength of specimens, ε_cut is the axial strain, ε_l is the lateral strain, R is the strength retention rate, and R_m is the average strength retention rate.