Study on the Durability of Concrete under an Underwater Coupling Environment

Table 1

Soil 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	S1	0	48031.51	4341.17	47161.62	7.59	Strong
	S2	0	49123.15	4031.09	9643.86	7.42	Strong
	S3	0	88.44	22.35	158.85	7.33	Micro
	S4	0	125.07	24.84	213.49	7.35	Micro
After backfilling	5#	0.5	74.55	40.37	194.88	7.42	Micro
	1#	0.6	60.72	39.39	191.03	7.59	Micro
	4#	0.6	75.98	37.60	252.49	7.60	Micro