Experimental Study on Strengthening and Sealing Materials and Their Application in Coal Mines

Table 6

Optimised ratio and result verification.

No.	Al (%)	Gypsum (%)	Ratio of water to material	Predictive expansion ratio (%)	Experimental expansion ratio (%)	Expansion ratio error	Predictive compressive strength (MPa)	Experimental compressive strength (MPa)	Compressive strength error (MPa)
1	0.51	1.37	0.6	10.7	10.3	0.4	15.1	14.8	0.2
2	0.52	1.86	0.55	10.5	10.3	0.2	15.2	15.5	−0.3
3	0.52	2	0.6	10.4	10.5	−0.1	15.4	15.3	0.1
4	0.52	1.88	0.53	10.9	10.2	0.7	15.2	15.7	−0.5
5	0.53	1.05	0.6	10.4	10.7	−0.3	15.6	15.2	0.4