Seismic Behavior of Corroded RC Bridges: Review and Research Gaps
Table 2
Important factors and their effects on critical chloride content.
Factor
Effect on critical chloride content
Total % cement weight
ratio
Free
Steel type and condition
Defect at steel-concrete interface
Polishing and sandblasting
Steel potential (>−200 mV SCE)
O
O
O
Steel potential (<−200 mV SCE)
Steel type
O
O
O
Concrete and binder properties
w/c ratio
Chloride binding
O
O
pH
Electrical resistivity
NC
Silica fume
Fly ash
↓↑
↓
↓
GGBS (ground granulated blast furnace slag)
↓↑
O
O
SRPC (low content)
NS
NS
External factors
Moisture in rather dry concrete
Moisture in nearly saturated concrete
Moisture variation
Oxygen availability
Temperature
Condensation in wet and drying cycle
NS
NS
indicates decreasing and increasing critical value with an increase of concerning factor; NS: result not stated; NC: the effect of the concerning factor is unclear; O: the concerning factor has no effect; b: contradicting results reported in the literature. SRPC: sulphate resistant Portland cement. indicates additional new factors if compared with the table presented by Angst et al. [11].
