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Article: Effect of alkalis on cementitious materials: Understanding the relationship between composition, structure, and volume change mechanism

TitleEffect of alkalis on cementitious materials: Understanding the relationship between composition, structure, and volume change mechanism
Authors
Issue Date2017
Citation
Journal of Advanced Concrete Technology, 2017, v. 15, n. 4, p. 165-177 How to Cite?
Abstract© Copyright 2017 Japan Concrete Institute. Previous studies demonstrated that alkalis can considerably affect the volumetric properties of hardened cementitious binders, including shrinkage, creep, and micro-cracking. The objective of this paper is to reexamine the effect of alkalis on the composition, nanostructure, phase stability, and morphology of calcium-silicate-hydrate (C-S-H) in cementitious materials, and to further propose a conceptual model bridging the C-S-H characters with its volume change mechanisms in alkali-enriched systems. The proposed microstructural model is an extension of the colloidal model of C-S-H considering the effect of alkalis. It is suggested that the presence of alkalis makes C-S-H more thermodynamically unstable and structurally disrupted, and easier to reorganize and redistribute upon drying-induced internal stresses or external loading. In addition, new experimental results regarding the influence of lithium on shrinkage and micro-cracking of alkali-Activated blast-furnace slag are discussed. It shows that lithium addition can dramatically improve the cracking resistance and volumetric stability of alkali-Activated slag.
Persistent Identifierhttp://hdl.handle.net/10722/251697
ISSN
2023 Impact Factor: 1.6
2023 SCImago Journal Rankings: 0.611
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorYe, Hailong-
dc.contributor.authorRadlińska, Aleksandra-
dc.date.accessioned2018-03-08T05:00:42Z-
dc.date.available2018-03-08T05:00:42Z-
dc.date.issued2017-
dc.identifier.citationJournal of Advanced Concrete Technology, 2017, v. 15, n. 4, p. 165-177-
dc.identifier.issn1346-8014-
dc.identifier.urihttp://hdl.handle.net/10722/251697-
dc.description.abstract© Copyright 2017 Japan Concrete Institute. Previous studies demonstrated that alkalis can considerably affect the volumetric properties of hardened cementitious binders, including shrinkage, creep, and micro-cracking. The objective of this paper is to reexamine the effect of alkalis on the composition, nanostructure, phase stability, and morphology of calcium-silicate-hydrate (C-S-H) in cementitious materials, and to further propose a conceptual model bridging the C-S-H characters with its volume change mechanisms in alkali-enriched systems. The proposed microstructural model is an extension of the colloidal model of C-S-H considering the effect of alkalis. It is suggested that the presence of alkalis makes C-S-H more thermodynamically unstable and structurally disrupted, and easier to reorganize and redistribute upon drying-induced internal stresses or external loading. In addition, new experimental results regarding the influence of lithium on shrinkage and micro-cracking of alkali-Activated blast-furnace slag are discussed. It shows that lithium addition can dramatically improve the cracking resistance and volumetric stability of alkali-Activated slag.-
dc.languageeng-
dc.relation.ispartofJournal of Advanced Concrete Technology-
dc.titleEffect of alkalis on cementitious materials: Understanding the relationship between composition, structure, and volume change mechanism-
dc.typeArticle-
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.3151/jact.15.165-
dc.identifier.scopuseid_2-s2.0-85018547178-
dc.identifier.volume15-
dc.identifier.issue4-
dc.identifier.spage165-
dc.identifier.epage177-
dc.identifier.isiWOS:000405494200002-
dc.identifier.issnl1346-8014-

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