Experimental Study on Low-Strength Similar-Material Proportioning and Properties for Coal Mining

Table 3

Range analysis.

Compressive strength/kPa			Elasticity modulus/kPa
Level	Sand-binder ratio (A)	Fly ash : gypsum (B)	Level	Sand-binder ratio (A)	Fly ash : gypsum (B)
1	72.386	40.560	1	2568.502	929.036
2	62.297	48.374	2	2287.891	1578.123
3	51.913	61.240	3	2028.174	2604.192
4	43.475	79.897	4	1799.980	3573.197
Range	28.911	39.337	Range	768.522	2644.161