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Crack initiation and propagation caused by corrosion-product expansion around corroding bars



Title: Crack initiation and propagation caused by corrosion-product expansion around corroding bars
Author(s): Yasuji Shinohara
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: 623 - 630
Total Pages: 8
Nb references: 6
Language: English


Abstract: Finite element (FE) analysis is performed on reinforced concrete (RC) beams to investigate crack initiation and propagation resulting from corrosion-product expansion of main reinforcement bars. Two-dimensional plane stress elements having the same thickness (60 mm) as the spacing of the transverse reinforcements are chosen, and three main reinforcing bars are modeled by means of three holes (20 mm in diameter). The variation factors are the amount of transverse reinforcement of the three levels (0 mm2, 28 mm2, and 112 mm2) in order to study the influence of the different confinement levels on crack behavior. In addition to the effect of confinement by means of transverse reinforcement, the effects of the position and the radically expanding direction of the corroding bars upon crack propagation behaviors are also discussed. Provided cracks appear separately for each main reinforcing bar, pressure-expansion relations are similar-despite the amount of transverse reinforcement, bar location, expanding direction and loading method controlled by internal pressure (load) or bar expansion (displacement). However, if cracks develop and connect to each other and propagate to the surface, pressure-expansion relations and crack behaviors depend greatly on the analytical conditions mentioned above.


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