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Article: Cement equivalence of metakaolin for workability, cohesiveness, strength and sorptivity of Concrete

TitleCement equivalence of metakaolin for workability, cohesiveness, strength and sorptivity of Concrete
Authors
Keywordscement equivalent factor
cohesiveness
metakaolin
sorptivity
strength
Issue Date2020
PublisherMDPIAG. The Journal's web site is located at http://www.mdpi.com/journal/materials/
Citation
Materials, 2020, v. 13 n. 7, p. article no. 1646 How to Cite?
AbstractA series of concrete mixes with metakaolin (MK) content ranging from 0 to 30% and water/cementitious materials (W/CM) ratio varying from 0.30 to 0.50 were produced for performance testing. The results showed that adding MK up to 20% as ordinary Portland cement (OPC) replacement best improved the 28-day and 70-day cube strengths, whereas adding MK up to 30% as OPC replacement always increased the cohesiveness and decreased the sorptivity, but impaired the workability. Moreover, the cement equivalent factor (CEF), i.e. the equivalent mass of OPC per mass of MK added, for each performance attribute, including workability and cohesiveness, was evaluated. Whilst the actual CEF of MK was generally higher at a higher W/CM ratio and lower at a higher MK content, overall, the average CEFs were found to be 1.98, 2.17, 3.83, 1.93, 2.12, and 4.70 for slump, flow, cohesiveness, 28-day cube strength, 70-day cube strength, and sorptivity coefficient, respectively. These CEF values indicated that the MK is a highly effective cementitious material for improving the cohesiveness, strength, and durability. Moreover, it has been demonstrated that the CEFs for workability and cohesiveness are useful parameters in aiding the mix design of MK concrete.
Persistent Identifierhttp://hdl.handle.net/10722/290880
ISSN
2023 Impact Factor: 3.1
2023 SCImago Journal Rankings: 0.565
PubMed Central ID
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorChen, JJ-
dc.contributor.authorLi, QH-
dc.contributor.authorNg, PL-
dc.contributor.authorLi, LG-
dc.contributor.authorKwan, AKH-
dc.date.accessioned2020-11-02T05:48:25Z-
dc.date.available2020-11-02T05:48:25Z-
dc.date.issued2020-
dc.identifier.citationMaterials, 2020, v. 13 n. 7, p. article no. 1646-
dc.identifier.issn1996-1944-
dc.identifier.urihttp://hdl.handle.net/10722/290880-
dc.description.abstractA series of concrete mixes with metakaolin (MK) content ranging from 0 to 30% and water/cementitious materials (W/CM) ratio varying from 0.30 to 0.50 were produced for performance testing. The results showed that adding MK up to 20% as ordinary Portland cement (OPC) replacement best improved the 28-day and 70-day cube strengths, whereas adding MK up to 30% as OPC replacement always increased the cohesiveness and decreased the sorptivity, but impaired the workability. Moreover, the cement equivalent factor (CEF), i.e. the equivalent mass of OPC per mass of MK added, for each performance attribute, including workability and cohesiveness, was evaluated. Whilst the actual CEF of MK was generally higher at a higher W/CM ratio and lower at a higher MK content, overall, the average CEFs were found to be 1.98, 2.17, 3.83, 1.93, 2.12, and 4.70 for slump, flow, cohesiveness, 28-day cube strength, 70-day cube strength, and sorptivity coefficient, respectively. These CEF values indicated that the MK is a highly effective cementitious material for improving the cohesiveness, strength, and durability. Moreover, it has been demonstrated that the CEFs for workability and cohesiveness are useful parameters in aiding the mix design of MK concrete.-
dc.languageeng-
dc.publisherMDPIAG. The Journal's web site is located at http://www.mdpi.com/journal/materials/-
dc.relation.ispartofMaterials-
dc.rightsThis work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.-
dc.subjectcement equivalent factor-
dc.subjectcohesiveness-
dc.subjectmetakaolin-
dc.subjectsorptivity-
dc.subjectstrength-
dc.titleCement equivalence of metakaolin for workability, cohesiveness, strength and sorptivity of Concrete-
dc.typeArticle-
dc.identifier.emailKwan, AKH: khkwan@hkucc.hku.hk-
dc.identifier.authorityKwan, AKH=rp00127-
dc.description.naturepublished_or_final_version-
dc.identifier.doi10.3390/ma13071646-
dc.identifier.pmid32252396-
dc.identifier.pmcidPMC7178314-
dc.identifier.scopuseid_2-s2.0-85082922062-
dc.identifier.hkuros318235-
dc.identifier.volume13-
dc.identifier.issue7-
dc.identifier.spagearticle no. 1646-
dc.identifier.epagearticle no. 1646-
dc.identifier.isiWOS:000529875600164-
dc.publisher.placeSwitzerland-
dc.identifier.issnl1996-1944-

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