Bearing Capacities of Different-Diameter Concrete-Filled Steel Tubes under Axial Compression

Table 3

Mechanical properties and mixture ratio of concrete.

Prism compressive strength [MPa]	41.24
Cube compressive strength [MPa]	51.51
Cement [kg⋅m^−3]	270
Water [kg⋅m^−3]	175
Sand [kg⋅m^−3]	865
Stone [kg⋅m^−3]	1015
Admixtures [kg⋅m^−3]	4.8
Fly ash [kg⋅m^−3]	67