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- Publisher Website: 10.1016/j.cemconcomp.2020.103721
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Article: Alkali cation effects on chloride binding of alkali-activated fly ash and metakaolin geopolymers
Title | Alkali cation effects on chloride binding of alkali-activated fly ash and metakaolin geopolymers |
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Authors | |
Keywords | Geopolymers Alkali-activated binders Fly ash Metakaolin Steel corrosion |
Issue Date | 2020 |
Publisher | Pergamon. The Journal's web site is located at http://www.elsevier.com/locate/cemconcomp |
Citation | Cement and Concrete Composites, 2020, v. 114, p. article no. 103721 How to Cite? |
Abstract | In this work, the chloride binding capacity and chloride penetration resistance of alkali-activated fly ash and metakaolin geopolymers synthesized with various alkali cation types (i.e., sodium or potassium) and aluminosilicate composition (i.e., combination of metakaolin and low-calcium pulverized fly ash) are studied. The chloride binding isotherms are measured using a modified equilibrium method and the effect of chloride exposure on the mineralogical alteration of geopolymers is studied by means of X-ray diffraction. The results show that the type of alkali cation considerably affects the chloride binding behaviors of metakaolin-fly ash geopolymers, regardless of aluminosilicate composition. In comparison to the potassium-based activator, sodium activator results in higher strength development, stronger chloride binding capacity, and better resistance to chloride penetration. The metakaolin-fly ash geopolymers immobilize chloride ions through both chemisorptions via the formation of chloride-bearing zeolites (e.g., Cl-chabazite) as well as physical adsorption. The dominant role of physical adsorption in binding mechanism suggests that a high proportion of hydroxyl group in the structure of sodium (or potassium)-aluminosilicate-hydrate (i.e., (N, K)-A-S-H) is exchangeable with chloride ions. |
Persistent Identifier | http://hdl.handle.net/10722/293287 |
ISSN | 2023 Impact Factor: 10.8 2023 SCImago Journal Rankings: 3.650 |
ISI Accession Number ID |
DC Field | Value | Language |
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dc.contributor.author | Fu, C | - |
dc.contributor.author | Ye, H | - |
dc.contributor.author | Zhu, K | - |
dc.contributor.author | Fang, D | - |
dc.contributor.author | Zhou, J | - |
dc.date.accessioned | 2020-11-23T08:14:32Z | - |
dc.date.available | 2020-11-23T08:14:32Z | - |
dc.date.issued | 2020 | - |
dc.identifier.citation | Cement and Concrete Composites, 2020, v. 114, p. article no. 103721 | - |
dc.identifier.issn | 0958-9465 | - |
dc.identifier.uri | http://hdl.handle.net/10722/293287 | - |
dc.description.abstract | In this work, the chloride binding capacity and chloride penetration resistance of alkali-activated fly ash and metakaolin geopolymers synthesized with various alkali cation types (i.e., sodium or potassium) and aluminosilicate composition (i.e., combination of metakaolin and low-calcium pulverized fly ash) are studied. The chloride binding isotherms are measured using a modified equilibrium method and the effect of chloride exposure on the mineralogical alteration of geopolymers is studied by means of X-ray diffraction. The results show that the type of alkali cation considerably affects the chloride binding behaviors of metakaolin-fly ash geopolymers, regardless of aluminosilicate composition. In comparison to the potassium-based activator, sodium activator results in higher strength development, stronger chloride binding capacity, and better resistance to chloride penetration. The metakaolin-fly ash geopolymers immobilize chloride ions through both chemisorptions via the formation of chloride-bearing zeolites (e.g., Cl-chabazite) as well as physical adsorption. The dominant role of physical adsorption in binding mechanism suggests that a high proportion of hydroxyl group in the structure of sodium (or potassium)-aluminosilicate-hydrate (i.e., (N, K)-A-S-H) is exchangeable with chloride ions. | - |
dc.language | eng | - |
dc.publisher | Pergamon. The Journal's web site is located at http://www.elsevier.com/locate/cemconcomp | - |
dc.relation.ispartof | Cement and Concrete Composites | - |
dc.subject | Geopolymers | - |
dc.subject | Alkali-activated binders | - |
dc.subject | Fly ash | - |
dc.subject | Metakaolin | - |
dc.subject | Steel corrosion | - |
dc.title | Alkali cation effects on chloride binding of alkali-activated fly ash and metakaolin geopolymers | - |
dc.type | Article | - |
dc.identifier.email | Ye, H: hlye@hku.hk | - |
dc.identifier.authority | Ye, H=rp02379 | - |
dc.description.nature | link_to_subscribed_fulltext | - |
dc.identifier.doi | 10.1016/j.cemconcomp.2020.103721 | - |
dc.identifier.scopus | eid_2-s2.0-85089424123 | - |
dc.identifier.hkuros | 319234 | - |
dc.identifier.volume | 114 | - |
dc.identifier.spage | article no. 103721 | - |
dc.identifier.epage | article no. 103721 | - |
dc.identifier.isi | WOS:000579761600007 | - |
dc.publisher.place | United Kingdom | - |
dc.identifier.issnl | 0958-9465 | - |