Effect on the Resistance of Concrete Acid Corrosion in Superficial Soil Layers

Table 4

The corrosion test results of concrete at urban and rural observation stations.

Number	Sample numbers	Stations	(%)	Compressive strength (MPa)				Corrosion index K (%)
				3 months	6 months	9 months	12 months	3 months	6 months	9 months	12 months
F-1	12	Urban	0	15.79	15.84	15.71	15.83	0	0	0	0
F-2	12		5	14.34	12.92	10.87	9.70	9.20	18.45	30.81	38.73
F-3	12		10	12.32	9.86	7.85	6.81	21.96	37.75	50.00	56.95
F-4	12	Rural	0	15.98	15.99	15.88	15.97	0	0	0	0
F-5	12		5	14.97	14.53	12.26	10.96	6.34	9.13	22.79	31.40
F-6	12		10	14.16	11.99	10.25	9.45	11.40	25.00	35.48	40.83