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dc.contributor.authorGe, W.
dc.contributor.authorZhang, Z.
dc.contributor.authorAshour, Ashraf
dc.contributor.authorLi, W.
dc.contributor.authorJiang, H.
dc.contributor.authorHu, Y.
dc.contributor.authorShuai, H.
dc.contributor.authorChuanzhi, S.
dc.contributor.authorLi, S.
dc.contributor.authorLiu, W.
dc.date.accessioned2023-03-16T11:49:38Z
dc.date.accessioned2023-03-24T10:29:56Z
dc.date.available2023-03-16T11:49:38Z
dc.date.available2023-03-24T10:29:56Z
dc.date.issued2023-06
dc.identifier.citationGe W, Zhang Z, Ashour AF et al (2023) Hydration characteristics, hydration products and microstructure of reactive powder concrete. Journal Of Building Engineering. 69: 106306.en_US
dc.identifier.urihttp://hdl.handle.net/10454/19375
dc.descriptionYesen_US
dc.description.abstractReactive Powder Concrete (RPC) is a new type of cementitious materials with a complex hydration mechanism, and active admixtures greatly influence the hydration reaction, formation of hydration products, and evolution of microstructure. In order to comprehensively study the quantitative effects of active admixtures contents, namely silica fume, slag and fly ash, on hydration characteristics, hydration products, and microstructure of RPCs, tests of workability, setting time, electrical conductivity, bound water and mechanical properties were conducted. Furthermore, a series of properties including morphology and micro-structure characteristics of RPCs were analyzed by thermogravimetric (TG) analysis, X-ray diffraction (XRD), fourier transform infrared spectroscopy (FTIR), mercury intrusion porosimetry (MIP), Brunauer-Emmet-Teller (BET), and scanning electron microscope (SEM). The results indicate that the initial hydration reaction rate of RPCs is reduced by partly replacing cement with active admixtures. The pozzolanic effect created by the active admixtures enhances hydration and improves RPC's compressive and flexural strength. RPCs made of cement-silica fume mixture exhibit the best macroscopic properties. The adoption of silica fume promotes the production of C-S-H gel during hydration and exerts pozzolanic and crystal nucleation effects to promote cement hydration. RPCs made of pure cement exhibit 15.3% porosity after 28 days of hydration, with the largest proportion of less harmful pores in the microstructure. The porosity is reduced to 5.2% when cement is partially replaced with silica fume, and the microstructure is dominated by harmless pores. When replacement of silica fume is kept at 25%, using slag powder or fly ash substitute part of cement also reduces the number of less harmful pores. It is beneficial to add slag powder to increase the number of gel pores, whereas fly ash reduces the number of gel pores. The investigation presented in this paper would contribute to the production of low cost and environmentally-friendly RPCs, and accelerate the wider applications of ultra-high performance concrete (UHPC) in engineering structures.en_US
dc.language.isoenen_US
dc.publisherElsevier
dc.relation.isreferencedbyhttps://doi.org/10.1016/j.jobe.2023.106306en_US
dc.rights© 2023 Elsevier. Reproduced in accordance with the publisher's self-archiving policy. This manuscript version is made available under the CC-BY-NC-ND 4.0 license (http://creativecommons.org/licenses/by-nc-nd/4.0/)en_US
dc.subjectReactive powder concreteen_US
dc.subjectActive admixtureen_US
dc.subjectHydration characteristicsen_US
dc.subjectHydration productsen_US
dc.subjectMicrostructureen_US
dc.titleHydration characteristics, hydration products and microstructure of reactive powder concreteen_US
dc.status.refereedYesen_US
dc.date.Accepted2023-03-14
dc.date.application2023-03-17
dc.typeArticleen_US
dc.date.EndofEmbargo2024-03-17
dc.type.versionAccepted manuscripten_US
dc.description.publicnotesThe full-text of this article will be released for publication on 17 Mar 2024.en_US
dc.rights.licenseCC-BY-NC-NDen_US
dc.date.updated2023-03-16T11:49:48Z
refterms.dateFOA2023-03-24T10:30:16Z
dc.openaccess.statusembargoedAccessen_US


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