Research on Deformation Mechanisms of a High Geostress Soft Rock Roadway and Double-Shell Grouting Technology

Table 5

Physical and mechanical properties of grouting materials.

1	Initial grouting time			2018.6.20	Water: solid		0.52 : 1
2	Cement and admixtures
	Cement (92%)	Admixtures (8%)
	P.O 52.5	Water reducing agent		Bentonite	Accelerator	Expansive agent	Other
		2.0		0.4	0.2	5.0	0.4
3	Physical and mechanical properties of grouting materials
	Liquid viscosity	Liquid time	Softening plasticity time	Hardening plastic time	Final setting time	Inflation rate	Bulk density	Compressive strength
	/s	/min				%	g/cm^3	MPa
	37.26	40	20	20	70	0.43	1.75	>30