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Early hydration of C4AF with silica fume and its role on katoite composition.

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Title: Early hydration of C4AF with silica fume and its role on katoite composition.
Authors: Boháč, Martin1 (AUTHOR) bohac@vush.cz, Zezulová, Anežka1 (AUTHOR), Krejčí Kotlánová, Michaela1 (AUTHOR), Kubátová, Dana1 (AUTHOR), Staněk, Theodor1 (AUTHOR), Krejza, Zdeněk1 (AUTHOR), Všianský, Dalibor2 (AUTHOR), Novotný, Radek3 (AUTHOR), Palovčík, Jakub3 (AUTHOR), Dvořák, Karel4 (AUTHOR)
Source: Journal of Microscopy. May2024, Vol. 294 Issue 2, p168-176. 9p.
Subjects: Hydration, X-ray microanalysis, Diffraction patterns, Silica fume, Smoke
Abstract: C4AF is considered the least reactive main clinker phase, but its reactivity may be affected by adding supplementary cementitious materials (SCMs). Pure C4AF was synthesised in a laboratory furnace, and the role of silica fume without gypsum on its early hydration properties was monitored. Burning was carried out in four stages to achieve 99% purity of C4AF. Heat flow development was monitored by isothermal calorimetry over 7 days of hydration at 20°C and 40°C. The role of silica fume on hydrogarnet phase katoite (Ca3Al2(SiO4)3 –x(OH)4x x = 1.5–3) formation during early hydration was studied. Rapid dissolution of C4AF, formation of metastable C‐(A,F)‐H and its conversion to C3(A, F)H6 was evidenced by isothermal calorimetry as a large exotherm. Changes in microstructure during early hydration were documented by SE micrographs, EDS point analyses, X‐ray mapping and line scans by SEM‐EDS. The phase composition was characterised by DTA‐TGA and QXRD after 7 days of hydration. The katoite diffraction pattern is similar for the reference sample and sample with silica fume, but substitution in its structure can be revealed by X‐ray microanalyses. The composition of katoite is variable due to the various extent of substitution of 4OH− by SiO44− due to silica fume. LAY DESCRIPTION: The paper discusses the role of silica fume on katoite formation during early hydration of C4AF. Rapid dissolution of C4AF, formation of metastable C‐(A,F)‐H and its conversion to C3(A, F)H6 was evidenced by isothermal calorimetry. Changes in microstructure during early hydration were documented by SE micrographs and X‐ray mapping and line scans by SEM‐EDS. The phase composition after 7 days of hydration was characterised by DTA‐TGA and QXRD. The high mobility of Al and Ca and the low mobility of Fe in the relic microstructure is discussed in the paper. Although katoite has the similar diffraction pattern for reference sample and sample with silica fume, different degrees of substitution in its structure can be seen in the silica fume system using SEM X‐ray microanalyses. [ABSTRACT FROM AUTHOR]
Copyright of Journal of Microscopy is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Label: Title
  Group: Ti
  Data: Early hydration of C<subscript>4</subscript>AF with silica fume and its role on katoite composition.
– Name: Author
  Label: Authors
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  Data: <searchLink fieldCode="AR" term="%22Boháč%2C+Martin%22">Boháč, Martin</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> bohac@vush.cz</i><br /><searchLink fieldCode="AR" term="%22Zezulová%2C+Anežka%22">Zezulová, Anežka</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Krejčí+Kotlánová%2C+Michaela%22">Krejčí Kotlánová, Michaela</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Kubátová%2C+Dana%22">Kubátová, Dana</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Staněk%2C+Theodor%22">Staněk, Theodor</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Krejza%2C+Zdeněk%22">Krejza, Zdeněk</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Všianský%2C+Dalibor%22">Všianský, Dalibor</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Novotný%2C+Radek%22">Novotný, Radek</searchLink><relatesTo>3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Palovčík%2C+Jakub%22">Palovčík, Jakub</searchLink><relatesTo>3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Dvořák%2C+Karel%22">Dvořák, Karel</searchLink><relatesTo>4</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22Journal+of+Microscopy%22">Journal of Microscopy</searchLink>. May2024, Vol. 294 Issue 2, p168-176. 9p.
– Name: Subject
  Label: Subjects
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  Data: <searchLink fieldCode="DE" term="%22Hydration%22">Hydration</searchLink><br /><searchLink fieldCode="DE" term="%22X-ray+microanalysis%22">X-ray microanalysis</searchLink><br /><searchLink fieldCode="DE" term="%22Diffraction+patterns%22">Diffraction patterns</searchLink><br /><searchLink fieldCode="DE" term="%22Silica+fume%22">Silica fume</searchLink><br /><searchLink fieldCode="DE" term="%22Smoke%22">Smoke</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: C4AF is considered the least reactive main clinker phase, but its reactivity may be affected by adding supplementary cementitious materials (SCMs). Pure C4AF was synthesised in a laboratory furnace, and the role of silica fume without gypsum on its early hydration properties was monitored. Burning was carried out in four stages to achieve 99% purity of C4AF. Heat flow development was monitored by isothermal calorimetry over 7 days of hydration at 20°C and 40°C. The role of silica fume on hydrogarnet phase katoite (Ca3Al2(SiO4)3 –x(OH)4x x = 1.5–3) formation during early hydration was studied. Rapid dissolution of C4AF, formation of metastable C‐(A,F)‐H and its conversion to C3(A, F)H6 was evidenced by isothermal calorimetry as a large exotherm. Changes in microstructure during early hydration were documented by SE micrographs, EDS point analyses, X‐ray mapping and line scans by SEM‐EDS. The phase composition was characterised by DTA‐TGA and QXRD after 7 days of hydration. The katoite diffraction pattern is similar for the reference sample and sample with silica fume, but substitution in its structure can be revealed by X‐ray microanalyses. The composition of katoite is variable due to the various extent of substitution of 4OH− by SiO44− due to silica fume. LAY DESCRIPTION: The paper discusses the role of silica fume on katoite formation during early hydration of C4AF. Rapid dissolution of C4AF, formation of metastable C‐(A,F)‐H and its conversion to C3(A, F)H6 was evidenced by isothermal calorimetry. Changes in microstructure during early hydration were documented by SE micrographs and X‐ray mapping and line scans by SEM‐EDS. The phase composition after 7 days of hydration was characterised by DTA‐TGA and QXRD. The high mobility of Al and Ca and the low mobility of Fe in the relic microstructure is discussed in the paper. Although katoite has the similar diffraction pattern for reference sample and sample with silica fume, different degrees of substitution in its structure can be seen in the silica fume system using SEM X‐ray microanalyses. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Journal of Microscopy is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
  BibEntity:
    Identifiers:
      – Type: doi
        Value: 10.1111/jmi.13280
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 9
        StartPage: 168
    Subjects:
      – SubjectFull: Hydration
        Type: general
      – SubjectFull: X-ray microanalysis
        Type: general
      – SubjectFull: Diffraction patterns
        Type: general
      – SubjectFull: Silica fume
        Type: general
      – SubjectFull: Smoke
        Type: general
    Titles:
      – TitleFull: Early hydration of C4AF with silica fume and its role on katoite composition.
        Type: main
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            NameFull: Krejčí Kotlánová, Michaela
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            NameFull: Staněk, Theodor
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            – D: 01
              M: 05
              Text: May2024
              Type: published
              Y: 2024
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              Value: 294
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