Protection of Steel Rebar in Salt-Contaminated Cement Mortar Using Epoxy Nanocomposite Coatings
Table 2
Parameters of equivalent circuits for the epoxy/nanoparticles coated rebar in different chloride cement mortars (0.3 and 0.5 wt.%) after 7, 28, and 56 days in 0.1 M NaOH solution.
Time of ponding (days)
(Ω)
(kΩ)
(F)
(MΩ)
(F)
(kΩ)
(F)
Coated with epoxy/nano-SiO2, 0.3 wt.% chloride cement mortar
7
148.6
11.65
103.1
197.9
28
197.6
15.69
11.14
26.82
56
237.9
16.11
39.6
11.46
Coated with epoxy/nano-SiO2, 0.5 wt.% chloride cement mortar
7
268.8
3.91
4.25
4.51
28
252.1
4.29
4.71
5.03
56
250.4
6.55
7.43
8.16
Coated with epoxy/nano-Fe2O3, 0.3 wt.% chloride cement mortar
7
305
23.2
421
210.9
28
276.3
30.6
153.3
164.2
56
344
53.5
88.1
49.7
Coated with epoxy/nano-Fe2O3, 0.5 wt.% chloride cement mortar
