Abstract
The service life design of reinforced concrete structures
requires material models capable of reliably describing
both mechanisms of damage and the general progression of
damage over time. However, most models that are currently
being used only capture the process of carbonation and
chloride penetration into the uncracked concrete that is
at the initial phase of degradation. Typically, these
models disregard the actual damage, i.e. the corrosion of
the reinforcing steel. As a result, the service life
design established to date only considers the end of the
initiation phase of the degradation process, or, in other
words, the onset of damage (time of depassivation or
onset of corrosion) as a critical limit state. The
corrosion of the reinforcement and its consequences, i.e.
the crack formation and spalling of concrete, are not
considered, which may lead to a substantially shorter
estimated service life of the structures.
Comprehensive investigations were recently undertaken on
the depassivation of steel reinforcement and on crack
formation in concrete which have resulted in an
analytical prediction model for corrosion-induced
cracking occurring in the surface zones of structural
components.
This paper presents a holistic approach which combines
two models used for determining the time to depassivation
(initiation phase) and the time to cover cracking as a
result of reinforcement corrosion (propagation phase). An
example is provided of a structural element which has
been designed for the serviceability limit state of
concrete cover cracking.
Original language | English |
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Title of host publication | Concrete Repair, Rehabilitation and Retrofitting IV |
Place of Publication | London |
Publisher | CRC Press |
Pages | 203-211 |
ISBN (Electronic) | 978-1-315-67764-4 |
ISBN (Print) | 978-1-138-02843-2 |
DOIs | |
Publication status | Published - 17 Sept 2015 |
MoE publication type | A4 Article in a conference publication |
Event | International Conference on Concrete Repair, Rehabilitation and Retrofitting, ICCRRR-4 - Leipzig, Germany Duration: 5 Oct 2015 → 7 Oct 2015 Conference number: 4 |
Conference
Conference | International Conference on Concrete Repair, Rehabilitation and Retrofitting, ICCRRR-4 |
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Abbreviated title | ICCRRR-4 |
Country/Territory | Germany |
City | Leipzig |
Period | 5/10/15 → 7/10/15 |
Keywords
- corrosion
- cracking
- reinforcement
- durability
- modelling
- concrete cover
- carbonation
- chlorides
- SLS