Experimental Study on Ultrahigh Strength Concrete Filled Steel Tube Short Columns under Axial Load

Table 2

Concrete mix proportion and key properties.

Mix proportion/kg/m^3									Working ability/mm		/MPa
Cement	Silica fume	Fly ash	Mineral powder	Expansion agent	Sand	Gravel	Water	Water reducer	Slump	Slump flow	7 d	28 d
480	60	50	35	50	609	1235	126	13.8	235	600	98.7	115.4