Prediction of the Frost Resistance of Iron Ore Tailings Concrete Based-BP Neural Network

Table 1

Mix proportion of iron ore tailings concrete (kg m⁻³) [16].

Concrete	Replace rate (%)	Cement	Sand	Gravel	Iron ore tailings sand	Water	W/B
C30	0	470	654.05	1,073.45	0	202.5	0.45
	20	470	523.24	1,073.45	130.81	202.5	0.45
	40	470	392.43	1,073.45	261.62	202.5	0.45
	60	470	261.62	1,073.45	392.43	202.5	0.45
	80	470	130.81	1,073.45	523.24	202.5	0.45

W/B: Water-binder ratio, mass ratio of water to cementitious material. Replace rate means the mass percentage of iron tailings sand that replaces natural sand.