Experimental Study on Physicomechanical Properties of Sandstone under Acidic Environment

Table 3

Mass change of the sandstone samples soaked in acid solution.

	T (days)		0	30	60	90	120	150	180
pH = 1 H2SO4	Sample #6	m (wet)	529.60	539.42	538.36	537.42	536.62	536.09	535.54
		m (dry)		528.32	527.28	526.29	525.52	524.96	524.52
	Sample #11	m (wet)	530.25	540.04	539.07	538.12	537.27	536.79	536.13
		m (dry)		529.01	527.87	526.96	526.09	525.56	525.17
	Sample #15	m (wet)	532.42	542.33	541.17	540.23	539.48	538.89	538.45
		m (dry)		531.10	530.13	529.06	528.38	527.79	527.30
		(%)		0.241	0.438	0.625	0.771	0.876	0.959
		(%)		1.854	1.654	1.476	1.325	1.225	1.121
pH = 3 H2SO4	Sample #18	m (wet)	530.34	538.93	538.24	537.58	537.02	536.48	536.01
		m (dry)		529.45	528.82	528.13	527.54	526.98	526.58
	Sample #22	m (wet)	531.16	539.73	539.05	538.46	537.91	537.26	536.98
		m (dry)		530.23	529.70	528.94	528.27	527.75	527.41
	Sample #26	m (wet)	532.48	541.13	540.43	539.69	539.12	538.68	538.03
		m (dry)		531.63	530.89	530.26	529.74	529.14	528.68
		(%)		0.167	0.286	0.416	0.527	0.633	0.708
		(%)		1.619	1.489	1.365	1.259	1.157	1.069