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

Table 5

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

	Solutions
Phase	Potable water	Mine water	Aggressive solution
Compressive strength (MPa)
Phase 0 (0 weeks)	33.67	33.67	33.67
Phase 1 (16 weeks)	32.13	33.05	34.91
Phase 2 (32 weeks)	—	32.13	26.31
Phase 3 (48 weeks)	36.87	30.83	20.48
Tangent modulus (GPa)
Phase 0 (0 weeks)	18.67	18.67	18.67
Phase 1 (16 weeks)	17.81	17.17	16.16
Phase 2 (32 weeks)	—	18.31	11.12
Phase 3 (48 weeks)	18.94	16.16	6.56
Secant modulus (GPa)
Phase 0 (0 weeks)	13.90	13.90	13.90
Phase 1 (16 weeks)	13.77	12.60	11.86
Phase 2 (32 weeks)	—	13.53	8.28
Phase 3 (48 weeks)	13.26	11.73	3.95