Acoustic Emission and Ultrasonic Characteristics in the Failure Process of Cemented Waste Concrete-Coal Gangue Backfilling (CWCGB) under Uniaxial Loading

Table 1

Cumulative residuals of the coal gangue and wasted concrete fine aggregate.

Type	Nominal diameter of mesh (mm)
	5	2.5	1.25	0.63	0.315	0.16
Coal gangue (%)	0.5	31.4	52.0	70.3	83.4	89.7
Waste concrete (%)	0.4	31.1	54.2	73.3	85.7	91.0