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Publication Number: FHWA-HRT-07-039
Date: July 2007
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Appendix C - Corrosion Resistant Alloys for Reinforced Concrete

EXAMPLE CALCULATION OF CORROSION RATE FROM WEIGHT LOSS DATA

The average corrosion rate, CR, over the exposure duration was determined from before and after specimen weight measurements using the expression,

Equation for calculating corrosion rate from weight loss. Corrosion rate equals the quotient of weight loss divided by metal density times exposed rebar specimen surface area times exposure time.(3.3)

where W is weigh loss, ρ is metal density, A is exposed rebar specimen surface area, and T is exposure time. From the density of iron (steel) and typical experimental parameters:

W = 1.6 grams
ρ = 7.87·106 grams/m3,
A = 76·10-4 m2, and
T = 0.0767 years (28 days),
 
appendix c
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