Influence of Mass Concentration on Microstructure and Pore Structure of Coal-Gangue-Based Green Cemented Filling Body

Table 2

Index of P·O42.5 cement.

Setting time		Flexural strength (MPa)		Compressive strength (MPa)		Specific surface area (m^2/kg)	Fineness (%)	Burning loss (%)	MgO (%)	SO3 (%)
Initial	Final	3 d	28 d	3 d	28 d
160	250	4.5	7.9	26.3	42.5	347	3.6	2.8	2.3	2.5