Experimental and Empirical Time to Corrosion of Reinforced Concrete Structures under Different Curing Conditions

Table 2

Description of different curing techniques and the results of 28-day compressive strength and chloride permeability.

Curing technique	Description	28-day (MPa)	RCPT (coulombs)	× 10^−12 (m^2/sec)
1	28 days in air at 23°C	53.16	3000	9.33
2	28 days in water at 23°C	76.16	2072	7.52
3	3 days in water and then air both at 23°C	73.33	2130	8.86
4	7 days in water and then air both at 23°C	75.44	2100	8.32
5	3 days in water at 23°C and then air at 3–5°C	65.85	2596	7.99
6	7 days in water at 23°C and then air at 3–5°C	69.21	2432	7.85
7	28 days in air at 3–5°C	47.45	3120	9.62
8	1 day in water at 50°C and then water at 23°C	58.91	3093	12.2
9	3 days in water at 50°C and then water at 23°C	59.38	3633	15.0
10	7 days in water at 50°C and then water at 23°C	57.88	3700	18.0