Design for Service Life, Bridge Birth Certificate & Concrete ...
Design for Service Life, Bridge Birth Certificate & Concrete ...
Design for Service Life, Bridge Birth Certificate & Concrete ...
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Chloride Induced Corrosion Models<br />
Fick’s 2 nd Law Models Time to Initiate Corrosion in<br />
Uncracked <strong>Concrete</strong><br />
C crit Cx ( covt , ) C o ( C s , Δx − C o )<br />
⎛ ⎛ cov − Δx ⎞⎞<br />
+<br />
⋅⎜<br />
1 − erf⎜<br />
⎟⎟<br />
⎝ ⎝ 2⋅<br />
D app , C ⋅t<br />
⎠⎠<br />
C(x,t)<br />
erf<br />
C crit<br />
C o<br />
C s,Δx<br />
cov<br />
D app,C<br />
Chloride concentration at depth & time<br />
Mathematical error function<br />
Critical chloride content (to initiate corrosion)<br />
Initial chloride content of the concrete<br />
Chloride concentration at surface or depth Δx<br />
Depth of concrete cover<br />
Apparent coefficient of chloride diffusion in<br />
concrete (permeability)<br />
28
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