Table 4.

Characteristic stress of Na₂SO₄ corroded sandstone (σ₃ = 10 MPa).

Na2SO4		U (kJ·m−3)	Ue (kJ·m−3)	Ud (kJ·m−3)	Ue/U	U d /U
pH	2	51.94	43.63	8.31	0.84	0.16
	4	58.69	51.06	7.63	0.87	0.13
	6	65.82	59.22	6.6	0.9	0.10
	7	80.51	74.06	6.45	0.92	0.08
	8	74.56	67.84	6.72	0.91	0.09
	10	64.91	57.13	7.78	0.88	0.12
	12	62.95	53.26	8.69	0.86	0.14
α (mol·L−1)	0.02	51.94	43.63	8.31	0.84	0.16
	0.04	44.70	36.65	8.05	0.82	0.18
	0.06	43.67	35.81	7.86	0.82	0.18
	0.08	37.74	30.57	7.17	0.81	0.19
	0.10	30.10	23.78	6.32	0.79	0.21