Effect of calcium aluminate cement in mitigating the corrosion of steel in concrete

Title: Effect of calcium aluminate cement in mitigating the corrosion of steel in concrete
Author(s): K.Y. Ann, J.P. Hwang, S.-H. Kim, I.L. Jang
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: 699 - 705
Total Pages: 7
Nb references: 9
Language: English

Abstract: In the present study, the inhibition effect of calcium aluminate cement (CAC) was assessed by electrochemical measurement for corrosion of steel in concrete containing chloride ions, together with chloride binding and chloride transport. Mortar specimens were cast with a centrally located steel rebar and chloride ions were admixed in mixing water, ranging from 0.0 to 3.0% by weight of cement. Then, the corrosion rate was monitored every 7 days by the linear polarisation technique. Chloride binding was measured at 7, 28, 56 and 91 days by the water extraction method using the cement paste containing the equivalent chloride ions for corrosion testing. Chloride transport was evaluated by a direct exposure to a salt water then to measure the apparent diffusion coefficient. As a result, it was found that chloride binding capacity for CAC was lower than for control specimens at all days, but the corrosion resistance was higher: the higher chloride threshold level for corrosion was obtained for CAC mortar specimens, imposing the longer corrosion free service life of concrete structures.
Moreover, after corrosion initiation, CAC sustained the lower rate of corrosion propagation.
For the rate of chloride transport, there was only marginal difference between CAC and control concretes.

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