U.S. Department of Transportation
Federal Highway Administration
1200 New Jersey Avenue, SE
Washington, DC 20590
202-366-4000


Skip to content U.S. Department of Transportation/Federal Highway AdministrationU.S. Department of Transportation/Federal Highway Administration

Federal Highway Administration Research and Technology
Coordinating, Developing, and Delivering Highway Transportation Innovations

 
Report
This report is an archived publication and may contain dated technical, contact, and link information
Publication Number: FHWA-HRT-07-039
Date: July 2007
<< Previous ContentsNext >>

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
<< Previous Contents Next >>
ResearchFHWA
FHWA
United States Department of Transportation - Federal Highway Administration