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The effect of corrosion inhibitors on the modelling of design lifetime of RC structures

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Abstract

The presented work aims to study the influence of corrosion inhibitors properties on the design Lifetime of reinforced concrete (RC) structures exposed to carbonation and chlorides environments. The inhibitors analysed are herein designated added admixture corrosion inhibitors and migrating corrosion inhibitors. The implementation of the mathematical models was made using existing experimental data of 6 concrete mixes as regards carbonation diffusion (2 mixes) and chloride migration (4 mixes) as well as experimental results concerning the specific effect of corrosion inhibitors on RC samples. The estimation of the design Lifetime was carried out in face of criteria concerning the probability of failure, as regards corrosion for RC elements, through a probabilistic analysis using the Monte Carlo method. The modelling results show that the use of both inhibitors enhances significantly the performance of RC elements. Additionally, an alternative method using safety factors was carried out considering the required adjustments to account for the influence of corrosion inhibitors.

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Abbreviations

c :

Concrete cover

c nom :

Nominal concrete cover

C R :

Chloride threshold by cement weight

C S :

Chloride surface amount by cement weight

D 0 :

Chloride migration coefficient

f c :

Compressive strength

f td :

Tensile strength

I corr :

Corrosion current density

K :

K D,C × K D,H × K D,T

k 0 :

Test parameter

k 1 :

Relative humidity parameter

k 2 :

Curing parameter

K D,C :

Curing parameter for chloride model

K D,H :

Relative humidity parameter for chloride model

K D,T :

Temperature parameter for chloride model

n (CO2):

Influence of soaking/drying over time

n (Cl):

Ageing factor

R C65 :

Accelerated carbonation resistance

RF:

Reduction factor

SF:

Safety factor

t 0 (CO2):

Reference period = 1 year

t 0 (Cl):

Testing age chloride model

t i :

Initiation period

t ic :

‘Deterministic’ initiation period in E465

t L :

Design lifetime

t g :

Target period

t p :

Propagation period

w/c :

Water/cement ratio

y :

Radius reduction factor

α:

Factor for uniform or pitting corrosion

ϕ 0 :

Steel bar diameter before corrosion

μ :

Mean value

erf1 :

Inverse of the error function

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Faustino, P., Brás, A. & Ripper, T. The effect of corrosion inhibitors on the modelling of design lifetime of RC structures. Mater Struct 48, 1303–1319 (2015). https://doi.org/10.1617/s11527-013-0235-x

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