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Materials and Structures

, 51:164 | Cite as

Impact of carbonation on the chloride diffusivity in concrete: experiment, analysis and application

  • Kefei LiEmail author
  • Yiming Zhang
  • Shengnian Wang
  • Junjie Zeng
50 years of Materials and Structures
  • 114 Downloads
Part of the following topical collections:
  1. 50 years of Materials and Structures

Abstract

This paper addresses the impact of carbonation on the chloride diffusivity in concrete through experimental and theoretical analysis. Chloride ingress tests were performed on concretes with OPC and complex binders (SZC) with/without carbonation, and the apparent chloride diffusivity was regressed with an enhanced diffusion model. Then, the impact of surface carbonation on the chloride ingress was investigated in terms of such influential factors as the pore structure, the chloride sorption, and the pore solution chemistry. Finally the results are applied to a design case of composite slabs exposed to marine atmosphere. The study shows that: (1) after carbonation, chloride sorption of OPC concretes is more affected than SZC concretes with complex binders and about 50% of sorption capacity is left for SZC concretes after carbonation; (2) the carbonation promotes the chloride diffusion, increasing the apparent chloride diffusivity by up to 80%, highlighting the impact of pore structure change on chloride diffusivity; (3) the durability requirements should consider the influence of surface carbonation for concrete exposed to marine air-borne salts but sheltered from natural precipitation.

Keywords

Concrete Durability Carbonation Chloride ingress Diffusivity 

Notes

Acknowledgements

The research is supported by National Key R&D Program of China No. 2017YFB0309904, and NSFC Project No. 51778332.

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

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Copyright information

© RILEM 2018

Authors and Affiliations

  1. 1.Civil Engineering DepartmentTsinghua UniversityBeijingChina
  2. 2.CCCC 4th Research Institute of Harbors and PortsGuangzhouChina

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