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Remaining strength prediction of reinforced steel bar concrete structure in seawater environment

AIP Conference Proceedings, ISSN: 1551-7616, Vol: 2489
2022
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Conference Paper Description

The mechanical properties of reinforced steel bar (rebar) for structures are the essential structural material applied in seawater conditions. Due to corrosion problem on reinforcing steels (RC), the structures face serious degradations which cause massive losses. In seawater environment, typical elements causing corrosion on RC are ions chlorine (Cl-) and carbon dioxide (CO2) gas which ingress into concretes. Both elements act as acidic agents for the concretes which cause RC de-passivation. Once RC corrodes it will be followed by progressive rust expansion to create cracks growth on the concretes. To understand and predict rebar life, this paper calculated remaining strength of rebar as effect of corrosion on RC. Corrosive elements considered were Cl- ions, CO2 gas and concrete porosity. Remaining strength of concretes were calculated analytically which refer to references and predictive models' software. In the model, mix design concrete of 25 MPa is subjected to external load under seawater conditions containing Cl- ions and CO2 gas. Such multi-factors were formulated using electrochemical and kinetics theories. The failures were considered as the result of the combination effects of concrete de-passivation and corrosion process in the steels.

Bibliographic Details

Yuli Panca Asmara; Muhammad Izzat Nor; Siti Nur Rahmah Anwar; S. Sugiman

AIP Publishing

Physics and Astronomy

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