Experimental Study on Reinforced Concrete Column Incased in Prefabricated Permanent Thin-Walled Steel Form

Table 3

Concrete mix proportion.

Design strength (MPa)	(mm)	(%)	(%)	Unit volume weight (kg/m^3)
				21	25	56.1	48.8	179	319	856	915	1.60
30	25	42.1	46.9	120	284	844	974	3.25