Experimental Study and Application of Inorganic Solidified Foam Filling Material for Coal Mines

Table 6

Physical parameters of fly ash.

Soundness (<1 mm, this was defined as the increased distance after boiling by Le-Chatelier method)	Fineness (<0.045 mm, %)	Loss on ignition (%)	Water content ratio (%)	Water content (%)
4.5	33.4	8.3	102	0.8