Seismic Behavior of Elliptical Concrete-Filled Steel Tubular Columns under Combined Axial Compression and Cyclic Lateral Loading

Table 2

Mix proportions of the concrete (kg/m³).

Concrete grade	Cement	Water	Fines	Coarse	Fly ash	Water reducer	Expansion mixture
C45	363	191	790	851	176	0	55
C60	355	177	740	935	109	10	54
C75	375	150	720	1025	115	12	58
C100	390	132	700	1050	102	16	60