Anglia Ruskin Research Online (ARRO)
Browse

File(s) under permanent embargo

Effects of Chloride ions on Carbonation Rate of Hardened Cement Paste by X-ray CT Techniques

journal contribution
posted on 2023-09-01, 13:56 authored by Junzhe Liu, Mingfang Ba, Yingang Du, Zhimin He, Jianbin Chen
Corrosion of steel bars in concrete structures is initiated as a result of concrete carbonation and/or chloride intrusion, and influenced by their interaction. This paper presents an experimental investigation into the effect of chloride ions on carbonation of cement paste by means of X-ray CT techniques and mercury intrusion porosimetry(MIP), which is benchmarked by the conventional phenolphthalein method. A group of the cement paste cylinders with different amounts of chlorides ions were manufactured and cured before they were subjected to an accelerated carbonation process in a conditional cabinet regime for different ages. The carbonation front of the cement paste was first evaluated using phenolphthalein method. This was followed by an investigation of microstructure evolution of the cement paste using XCT and MIP techniques. The experimental results show that the carbonation of a cement paste increases with its water to cement ratio and with carbonation ages, but decrease with its amount of chloride ions. In particular, it has been found that increases of chloride ion of a cement paste refine its porous structures, decrease its porosity and eventually mitigate its carbonation rate. The relevant results can be referred to for durability design and prediction of reinforced concrete structures.

History

Refereed

  • Yes

Volume

122

Page range

619-627

Publication title

Construction and Building Materials

ISSN

1879-0526

Publisher

Elsevier

File version

  • Other

Language

  • eng

Legacy posted date

2017-01-25

Legacy creation date

2017-01-19

Legacy Faculty/School/Department

ARCHIVED Faculty of Science & Technology (until September 2018)

Usage metrics

    ARU Outputs

    Categories

    No categories selected

    Exports

    RefWorks
    BibTeX
    Ref. manager
    Endnote
    DataCite
    NLM
    DC