Experimental Study and Application of Inorganic Solidified Foam Filling Material for Coal Mines

Table 2

Physical parameters of ordinary Portland cement.

Fineness (0.08 mm, residue on square hole sieve)	Apparent density (kg/m^3)	Initial setting time (min)	Final setting time (min)	Compressive strength (MPa)
				1 d	28 d
8%	3.06	139	375	12.8	46.7