Hu, J;
Li, S;
Lu, Y;
Zhang, H;
Zhang, M;
(2020)
Efficiency of electrochemical extraction of chlorides in fly ash concrete using carbon fibre mesh anode.
Construction and Building Materials
, 249
, Article 118717. 10.1016/j.conbuildmat.2020.118717.
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Abstract
This paper presents an experimental study on the effect of anode format (carbon fibre sheet (Cs), mesh (Cm) and plate (Cp)), current density (0, 1, 2, and 3 A/m^{2} eferred to the surface area of reinforcement), and fly ash content (plain concrete, 10%, 20% and 30% replacement by weight of cement) on the efficiency of electrochemical chloride extraction (ECE). The results showed the total extracted chloride contents of samples treated with different anodes had an order of Cs > Cm > Cp. The distribution of anodic reaction products indicated that only a small part of Cs played as anode because of the insulation in its transverse direction while Cm performed better conductivity uniformity and accordingly higher usage. With the increase of current density, the extracted chloride content improved, but the improvement was very limited when the current density kept rising. The incorporation of fly ash led to 12%–153.1% improvement in extracted chlorides. After ECE, the measured residual free chloride content in concrete did not change with current density or fly ash content, except for the cases when current density was increased from 0 to 1 A/m^{2}. The additional extracted chlorides with increasing current density or fly ash content can be attributed to the dissolution of bound chlorides. The contribution of increasing compactness by adding fly ash was offset by the destruction of Friedel’s salt and the resulting release of chloride ions in the alkali environment and under the impressed currents.
| Type: | Article |
|---|---|
| Title: | Efficiency of electrochemical extraction of chlorides in fly ash concrete using carbon fibre mesh anode |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1016/j.conbuildmat.2020.118717 |
| Publisher version: | https://doi.org/10.1016/j.conbuildmat.2020.118717 |
| Language: | English |
| Additional information: | This version is the author accepted manuscript. For information on re-use, please refer to the publisher's terms and conditions. |
| Keywords: | Corrosion, Electrochemical rehabilitation, Fly ash, Blended concrete, Carbon fibre anode |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Civil, Environ and Geomatic Eng |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10094156 |
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