[Retracted] Mechanical Behavior of Silica Fume Concrete Filled with Steel Tubular Composite Column

Table 2

Compressive strength behavior of cubes.

Mix	Percentage replacement of silica fume (%)	7 days strength (MPa)	28 days strength (MPa)
1	0	24.12	33.28
2	5	25.48	35.14
3	10	26.89	37.61
4	15	25.08	35.87