Model for Sulfate Diffusion Depth in Concrete under Complex Aggressive Environments and Its Experimental Verification

Table 6

Diffusion depth values calculated by various models (mm).

Time; (day)	Solution pressure (MPa)	Test value; (mm)	Equation (24)		Equation (25)		Equation (26)		Equation (23)
			Calculated depth	Relative error %	Calculated depth	Relative error %	Calculated depth	Relative error %	Calculated depth	Relative error %
45		7.8	—	—	—	—	—	—	—	—
65		9.31	11.26	20.9	8.8	5.5	9.37	0.06	—	—
85		10.37	14.73	42	9.62	7.2	10.72	3.4	10.58	2.0
105	1.5	11.50	18.20	58.8	10.32	10.3	11.91	3.6	11.71	1.83
125		12.76	21.67	71	10.93	14.3	13	1.9	12.74	0.16
145		14.15	25.13	77.6	11.48	18.9	14	1.1	13.68	3.32
165		15.65	28.60	82.7	11.98	23.5	14.94	4.6	14.55	7.03
45		9.22	—	—	—	—	—	—	—	—
65		11.01	13.32	21	10.39	5.7	11.08	0.6	—	—
85		12.26	17.42	42	11.37	7.2	12.67	3.4	12.51	2.0
105	3.0	13.59	21.51	58	12.19	10.3	14.08	3.6	13.85	1.91
125		15.09	15.61	69.7	12.92	14.4	15.37	1.8	15.06	0.20
145		16.73	29.71	77.6	13.57	18.9	16.55	1.0	16.17	3.34
165		18.5	33.81	82.7	14.16	23.5	17.66	4.6	17.2	7.02