Application of Thermal Insulation Gunite Material to the High Geo-Temperature Roadway

Table 2

Scheme of orthogonal experiment on the material ratio.

Level	Factor
	Fly ash A (%)	Vitrified microsphere B (%)	River sand C (%)
1	40	10	60
2	50	20	80
3	60	30	100

Note. The percentages are obtained from the ratios of masses of corresponding materials to the total mass of cement and fly ash.