Compression of Aggregates of Acid-Leached Coal Gangues: Implications for Coal Mine Backfill

Table 3

Experimental combinations.

Number	Sample name	Particle size	pH	Immersion time (d)
1	SP 15–20 (3)	15–20 mm	3	12
2	SP 10–15 (3)	10–15 mm
3	SP 5–10 (3)	5–10 mm
4	SP 15–20 (5)	15–20 mm	5
5	SP 10–15 (5)	10–15 mm
6	SP 5–10 (5)	5–10 mm
7	SP 15–20 (7)	15–20 mm	7
8	SP 10–15 (7)	10–15 mm
9	SP 5–10 (7)	5–10 mm