Understandings on the Performance of Concrete-Filled Steel Tube with Different Kinds of Concrete Infill

Table 3

Compressive strength of concrete.

Type of cube	Age of testing (days)	Average compressive strength of concrete (MPa)		% Difference
		Water curing	Self-curing/ambient curing
CC	7	20.24	20.53	1.42
	28	32.67	33.68	3.04
SC	7	21.62	23.12	6.70
	28	33.50	33.89	1.15
GC	7	—	23.73	—
	28	—	33.89	—
EC	7	23.96	26.37	9.53
	28	33.90	34.70	2.33