File Download

There are no files associated with this item.

  Links for fulltext
     (May Require Subscription)
Supplementary

Article: Influence of activator composition on the chloride binding capacity of alkali-activated slag

TitleInfluence of activator composition on the chloride binding capacity of alkali-activated slag
Authors
KeywordsAlkali-activated slag
Chloride-induced steel corrosion
Chloride binding isotherm
Alkaline activator
Chloride binding capacity
Issue Date2019
PublisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/cemconcomp
Citation
Cement and Concrete Composites, 2019, v. 104, p. article no. 103368 How to Cite?
AbstractIn this work, the mechanisms of chloride binding in alkali-activated slag (AAS) pastes are studied, towards a better understanding of the role of activator composition (i.e., NaOH, Na2CO3, Na2SO4, KOH, and K2CO3 solutions) on its chloride binding capacity. The impact of chloride on the mineralogical and compositional alteration of AAS is investigated by means of X-ray diffraction (XRD), thermogravimetric analysis (TGA), scanning electron microscopy with energy-dispersive X-ray spectroscopy (SEM/EDS), and thermodynamic modeling. The results show that hardened AAS paste has an approximately 70%–150% stronger chloride binding capacity than ordinary portland cement (OPC) pastes in a 1.0 M NaCl environment, depending on the activator type. The AFm-type and hydrotalcite-type phases in hardened AAS pastes contribute to about 40%–70% of the total chloride binding capacity. The type of preoccupied anions in the AFm-type phases (e.g., OH−, CO32−, SO42−) affects the polymorphs of Friedel's salts formed in AAS. The sulfate-activated slag has a slightly higher chloride binding capacity than hydroxide- and carbonate-counterparts likely due to the transformation of existing ettringite to Friedel's salts.
Persistent Identifierhttp://hdl.handle.net/10722/293277
ISSN
2020 Impact Factor: 7.586
2015 SCImago Journal Rankings: 3.017
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorYe, H-
dc.contributor.authorHuang, L-
dc.contributor.authorCHEN, Z-
dc.date.accessioned2020-11-23T08:14:24Z-
dc.date.available2020-11-23T08:14:24Z-
dc.date.issued2019-
dc.identifier.citationCement and Concrete Composites, 2019, v. 104, p. article no. 103368-
dc.identifier.issn0958-9465-
dc.identifier.urihttp://hdl.handle.net/10722/293277-
dc.description.abstractIn this work, the mechanisms of chloride binding in alkali-activated slag (AAS) pastes are studied, towards a better understanding of the role of activator composition (i.e., NaOH, Na2CO3, Na2SO4, KOH, and K2CO3 solutions) on its chloride binding capacity. The impact of chloride on the mineralogical and compositional alteration of AAS is investigated by means of X-ray diffraction (XRD), thermogravimetric analysis (TGA), scanning electron microscopy with energy-dispersive X-ray spectroscopy (SEM/EDS), and thermodynamic modeling. The results show that hardened AAS paste has an approximately 70%–150% stronger chloride binding capacity than ordinary portland cement (OPC) pastes in a 1.0 M NaCl environment, depending on the activator type. The AFm-type and hydrotalcite-type phases in hardened AAS pastes contribute to about 40%–70% of the total chloride binding capacity. The type of preoccupied anions in the AFm-type phases (e.g., OH−, CO32−, SO42−) affects the polymorphs of Friedel's salts formed in AAS. The sulfate-activated slag has a slightly higher chloride binding capacity than hydroxide- and carbonate-counterparts likely due to the transformation of existing ettringite to Friedel's salts.-
dc.languageeng-
dc.publisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/cemconcomp-
dc.relation.ispartofCement and Concrete Composites-
dc.subjectAlkali-activated slag-
dc.subjectChloride-induced steel corrosion-
dc.subjectChloride binding isotherm-
dc.subjectAlkaline activator-
dc.subjectChloride binding capacity-
dc.titleInfluence of activator composition on the chloride binding capacity of alkali-activated slag-
dc.typeArticle-
dc.identifier.emailYe, H: hlye@hku.hk-
dc.identifier.emailHuang, L: huangle@hku.hk-
dc.identifier.authorityYe, H=rp02379-
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1016/j.cemconcomp.2019.103368-
dc.identifier.scopuseid_2-s2.0-85069616249-
dc.identifier.hkuros319196-
dc.identifier.volume104-
dc.identifier.spagearticle no. 103368-
dc.identifier.epagearticle no. 103368-
dc.identifier.isiWOS:000501649500035-
dc.publisher.placeUnited Kingdom-
dc.identifier.issnl0958-9465-

Export via OAI-PMH Interface in XML Formats


OR


Export to Other Non-XML Formats