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Corrosion of reinforcing steel and behaviour of rienforced concrete beams under sustained load



Title: Corrosion of reinforcing steel and behaviour of rienforced concrete beams under sustained load
Author(s): Anongdeth Phetkaysone, Ryoichi Sato, Ryohei Yamada
Paper category : conference
Book title: 2nd International Symposium on Service Life Design for Infrastructures
Editor(s): K. van Breugel, Guang Ye, Yong Yuan
Print-ISBN: 978-2-35158-096-7
e-ISBN: 978-2-35158-097-4
Publisher: RILEM Publications SARL
Publication year: 2010
Pages: 645 - 654
Total Pages: 10
Nb references: 9
Language: English


Abstract: Penetration of the deterioration substances like water and chloride ions though cracks into the concrete, generally, induces and accelerates corrosion of reinforcing stesssel in reinforced concrete (referred to as ‘RC’ hereafter) structures. The behaviour of RC beams under sustained load is investigated to simulate RC structures in very severe chloride environment.
As examination parameters, reinforcement stress with three levels of stress and cover of three different thicknesses are adopted. According to the results, the corrosion initiation time, was not influenced by the reinforcement stress level as well as the cover thickness in cracked zone of beams under sustained loading, which as expected, was dependent on the cover thickness for beams without loading. Results also showed that the corrosion crack width became larger as the reinforcement stress became higher as well as the cover thickness became smaller.
Furthermore, the time dependent deflections of beams with severely increasing widths of corrosion cracks were compared to those with slightly increasing widths of corrosion cracks, as well as the calculations neglecting the effect of corrosion induced damage. It was found through the comparisons that the deflection with time was increased by severely increasing width of corrosion crack.


Online publication: 2011-04-20
Publication type : full_text
Public price (Euros): 0.00