An Experimental Evaluation of the Weathering Effects on Mine Shaft Lining Materials

Table 4

Mortar: compressive strength, tangent modulus, and secant modulus.

	Solutions
Phase	Potable water	Mine water	Aggressive solution
Compressive strength (MPa)
Phase 0 (0 weeks)	10.19	10.19	10.19
Phase 1 (16 weeks)	8.48	9.59	8.89
Phase 2 (32 weeks)	—	12.42	7.17
Phase 3 (48 weeks)	11.51	11.31	—
Tangent modulus (GPa)
Phase 0 (0 weeks)	4.85	4.85	4.85
Phase 1 (16 weeks)	3.52	4.88	1.80
Phase 2 (32 weeks)	—	4.73	1.00
Phase 3 (48 weeks)	3.20	2.55	—
Secant modulus (GPa)
Phase 0 (0 weeks)	2.96	2.96	2.96
Phase 1 (16 weeks)	2.45	3.31	1.33
Phase 2 (32 weeks)	—	3.06	0.73
Phase 3 (48 weeks)	1.61	1.74	—