Study on the Durability of Concrete under an Underwater Coupling Environment

Table 2

Groundwater corrosion before and after backfilling.

Time	Sampling location	Depth (m)	Cl^− (mg·kg^−1)	Mg^2− (mg·kg^−1)	SO4^2− (mg·kg^−1)	PH	Corrosion
Before backfilling	S5	0	43863.54	2266.99	4298.69	8.48	Strong
	S6	0	43897.13	2272.95	4346.77	8.54	Strong
	S7	0	43874.72	2269.33	4308.24	8.50	Strong
After backfilling	5#	3.7	34739.81	1739.67	4110.91	8.51	Strong
	1#	4.8	41101.75	1551.85	3821.08	8.37	Strong
	4#	2.9	36738.28	1724.10	4123.06	8.45	Strong