Preparation of Baking-Free Brick from Manganese Residue and Its Mechanical Properties

Table 5

Compressive strength under different ratios of cement to sand.

Formula	Cement-sand ratio	Water-solid ratio	Compressive strength (MPa)
			7d	28d
1	1 : 2.0	0.11	10.4	12.4
2	1 : 1.5	0.12	11.9	15.3
3	1 : 1.0	0.15	14.7	19.0
4	1 : 0.6	0.18	14.3	18.1
5	1 : 0	0.22	7.9	16.5