Yang, Y;
Huang, C;
Guo, W;
Zhao, H;
Li, Z;
Li, J;
Bao, J;
(2020)
Study of the Effect of Surface Treatment on the Chloride Ion Transport at the Cementitious Spacer-Concrete Interface.
Applied Sciences
, 10
(15)
, Article 5196. 10.3390/app10155196.
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Abstract
Spacers are important components in reinforced concrete structures to provide cover between the steel reinforcement and the formwork. Cementitious spacers are of particular interest for coastal engineering structures, as they are compatible with cement-based chloride-resistant high-performance concrete compared to plastic and steel spacers. However, the cementitious spacer–concrete interface was found to be highly porous and microcracked. This study investigated the effect of surface treatment on the chloride ion transport at the cementitious spacer–concrete interface. A surface treatment technique for potential mass production was introduced and the state-of-practice tests of the hardened concrete were modified to evaluate the performance of the spacer–concrete composite specimens. The results showed that the surface treatment on a cementitious spacer improved the bonding between the spacer and concrete at the interface. The surface treatment of the spacer improved the compressive strength and the chloride resistance of the composite specimen locally compared to those without surface treatment. The advantage of surface treatment on the chloride resistance was partially represented in either the diffusion coefficient or the column electric flux. The maximum chloride ion penetration depth at the spacer–concrete interface was recommended as an additional proxy for the evaluation of the chloride resistance performance of composite specimens.
| Type: | Article |
|---|---|
| Title: | Study of the Effect of Surface Treatment on the Chloride Ion Transport at the Cementitious Spacer-Concrete Interface |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.3390/app10155196 |
| Publisher version: | http://dx.doi.org/10.3390/app10155196 |
| Language: | English |
| Additional information: | This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. |
| Keywords: | surface treatment, cementitious spacer, chloride resistance, concrete, DURABILITY |
| 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/10128402 |
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