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

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F26232511%3A_____%2F24%3AN0000007" target="_blank" >RIV/26232511:_____/24:N0000007 - isvavai.cz</a>
Result on the web
<a href="https://onlinelibrary-wiley-com.ezproxy.techlib.cz/journal/13652818" target="_blank" >https://onlinelibrary-wiley-com.ezproxy.techlib.cz/journal/13652818</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1111/jmi.13280" target="_blank" >10.1111/jmi.13280</a>

Result language
angličtina
Original language name
Early hydration of C4AF with silica fume and its role on katoite composition
Original language description
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.
Czech name
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Czech description
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Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
—
OECD FORD branch
20100 - Civil engineering

Project
<a href="/en/project/GA23-05122S" target="_blank" >GA23-05122S: The role of combination of fluxes, mineralizers and SCMs on properties of low-energy clinker</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year
2024
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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