Chloride-binding capacity of cement-GGBFS-nanosilica composites under seawater chloride-rich environment

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dc.contributor.author Qu, Fulin
dc.contributor.author Li, Wengui
dc.contributor.author Guo, Yipu
dc.contributor.author Zhang, Shishun
dc.contributor.author Zhou, John L.
dc.contributor.author Wang, Kejin
dc.contributor.department Civil, Construction and Environmental Engineering
dc.date.accessioned 2022-06-06T14:48:55Z
dc.date.available 2022-06-06T14:48:55Z
dc.date.issued 2022-08-01
dc.description.abstract The effects of granulated blast furnace slag (GGBFS) and nano-silica (NS) on the chloride-binding capacity of cement paste after 6-month exposure to seawater chloride-rich solutions were investigated in this paper. The pH, chloride-binding ratio (CBR), leaching behavior, and phase transformation were investigated by various experimental and analysis methods. Thermodynamic modeling was also used to study the phase assemblages for the Portland cement-GGBFS-NS composites exposed to the NaCl and MgCl2 solutions. It was found that for all cementitious composites, more chlorides were bounded in samples exposed to the salt solutions with sodium ions than that with magnesium ions. Proper additions of GGBFS and NS can enhance the chloride-binding capacity of cementitious composites. The results confirm that the addition of GGBFS can improve the chemical chloride-binding capacity because of the increased amount of chloroaluminate. The increased amount of hydrated gels in the cementitious composites with GGBFS also improved the physical chloride-binding capacity. The addition of NS increased the physical chloride-binding capacity due to the more formation of C-S-H/C-A-S-H gels, while the excessive addition of NS left less aluminum phase available for the formation of chloroaluminate, thus further decreased the chemical chloride-binding capacity. Magnesium ions in solutions increased the amount of chloride in the diffuse layer of C-S-H gels and hydrotalcite. The related results provide novel insight into the influences of GGBFS and NS on the chloride-binding capacity of cementitious composites under chloride-rich environments.
dc.description.comments This is a manuscript of an article published as Qu, Fulin, Wengui Li, Yipu Guo, Shishun Zhang, John L. Zhou, and Kejin Wang. "Chloride-binding capacity of cement-GGBFS-nanosilica composites under seawater chloride-rich environment." Construction and Building Materials 342 (2022): 127890. DOI: 10.1016/j.conbuildmat.2022.127890. Copyright 2022 Elsevier Ltd. Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0). Posted with permission.
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/7wbO2EWv
dc.language.iso en
dc.publisher Elsevier Ltd.
dc.source.uri https://doi.org/10.1016/j.conbuildmat.2022.127890 *
dc.subject.keywords Cementitious composites
dc.subject.keywords Chloride-binding ratio
dc.subject.keywords Corrosion
dc.subject.keywords Nanosilica
dc.subject.keywords Thermodynamic modeling
dc.subject.keywords Chloride-rich environment
dc.title Chloride-binding capacity of cement-GGBFS-nanosilica composites under seawater chloride-rich environment
dc.type Article
dspace.entity.type Publication
relation.isAuthorOfPublication f9071b81-012f-4b6d-a040-9083bc33535c
relation.isOrgUnitOfPublication 933e9c94-323c-4da9-9e8e-861692825f91
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