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Article: Early-stage geopolymerization revealed by 27Al and 29Si nuclear magnetic resonance spectroscopy based on vacuum dehydration

TitleEarly-stage geopolymerization revealed by 27Al and 29Si nuclear magnetic resonance spectroscopy based on vacuum dehydration
Authors
KeywordsGeopolymerization process
NMR
Fuzzy analysis
Vacuum dehydration
Polymeric structure
Issue Date2021
PublisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/conbuildmat
Citation
Construction and Building Materials, 2021, v. 266 n. pt. B, p. article no. 121114 How to Cite?
AbstractThe geopolymerization process affects the mechanical properties and chemical durability of geopolymer cement by forming alkali aluminosilicate gels of varying degrees of polymerization. An integrated and accurate analysis of geopolymerization process cannot be easily achieved due to the restriction of in-situ detection. In this work, vacuum dehydration is demonstrated to be an efficient and reliable method to arrest geopolymerization of pulpy and paste samples for nuclear magnetic resonance (NMR) analysis. Consistent and reliable results on inchoate geopolymerization can be obtained by one single test with constant instrumental parameters. Four stages of geopolymerization are identified, including dissolution, orderly polymerization in the short range, structural rearrangement, and unordered condensation. Each stage is differentiated by the reaction duration and Qm(nAl) evolution. The results support the existing geopolymerization theories but also provide new insights into the mechanisms by which free water loss affects structural rearrangement of geopolymers.
Persistent Identifierhttp://hdl.handle.net/10722/293270
ISSN
2023 Impact Factor: 7.4
2023 SCImago Journal Rankings: 1.999
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorZhu, X-
dc.contributor.authorYan, D-
dc.contributor.authorFang, H-
dc.contributor.authorChen, S-
dc.contributor.authorYe, H-
dc.date.accessioned2020-11-23T08:14:18Z-
dc.date.available2020-11-23T08:14:18Z-
dc.date.issued2021-
dc.identifier.citationConstruction and Building Materials, 2021, v. 266 n. pt. B, p. article no. 121114-
dc.identifier.issn0950-0618-
dc.identifier.urihttp://hdl.handle.net/10722/293270-
dc.description.abstractThe geopolymerization process affects the mechanical properties and chemical durability of geopolymer cement by forming alkali aluminosilicate gels of varying degrees of polymerization. An integrated and accurate analysis of geopolymerization process cannot be easily achieved due to the restriction of in-situ detection. In this work, vacuum dehydration is demonstrated to be an efficient and reliable method to arrest geopolymerization of pulpy and paste samples for nuclear magnetic resonance (NMR) analysis. Consistent and reliable results on inchoate geopolymerization can be obtained by one single test with constant instrumental parameters. Four stages of geopolymerization are identified, including dissolution, orderly polymerization in the short range, structural rearrangement, and unordered condensation. Each stage is differentiated by the reaction duration and Qm(nAl) evolution. The results support the existing geopolymerization theories but also provide new insights into the mechanisms by which free water loss affects structural rearrangement of geopolymers.-
dc.languageeng-
dc.publisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/conbuildmat-
dc.relation.ispartofConstruction and Building Materials-
dc.subjectGeopolymerization process-
dc.subjectNMR-
dc.subjectFuzzy analysis-
dc.subjectVacuum dehydration-
dc.subjectPolymeric structure-
dc.titleEarly-stage geopolymerization revealed by 27Al and 29Si nuclear magnetic resonance spectroscopy based on vacuum dehydration-
dc.typeArticle-
dc.identifier.emailYe, H: hlye@hku.hk-
dc.identifier.authorityYe, H=rp02379-
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1016/j.conbuildmat.2020.121114-
dc.identifier.scopuseid_2-s2.0-85079839722-
dc.identifier.hkuros318759-
dc.identifier.volume266-
dc.identifier.issuept. B-
dc.identifier.spagearticle no. 121114-
dc.identifier.epagearticle no. 121114-
dc.identifier.isiWOS:000600793700025-
dc.publisher.placeNetherlands-
dc.identifier.issnl0950-0618-

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