Detail publikace

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

BOHÁČ, M. ZEZULOVÁ, A. KREJČÍ KOTLÁNOVÁ, M. KUBÁTOVÁ, D. STANĚK, T. KREJZA, Z. VŠIANSKÝ, D. NOVOTNÝ, R. PALOVČÍK, J. DVOŘÁK, K.

Originální název

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

Typ

článek v časopise ve Web of Science, Jimp

Jazyk

angličtina

Originální abstrakt

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.

Klíčová slova

C(4)AF; hydration; katoite; microstructure; silica fume

Autoři

BOHÁČ, M.; ZEZULOVÁ, A.; KREJČÍ KOTLÁNOVÁ, M.; KUBÁTOVÁ, D.; STANĚK, T.; KREJZA, Z.; VŠIANSKÝ, D.; NOVOTNÝ, R.; PALOVČÍK, J.; DVOŘÁK, K.

Vydáno

29. 2. 2024

Nakladatel

WILEY

Místo

HOBOKEN

ISSN

1365-2818

Periodikum

Journal of Microscopy

Ročník

28.2.2024

Číslo

28.2.2024

Stát

Spojené království Velké Británie a Severního Irska

Strany od

1

Strany do

9

Strany počet

9

URL

https://onlinelibrary.wiley.com/doi/full/10.1111/jmi.13280

BibTex

@article{BUT188310,
  author="Martin {Boháč} and Anežka {Zezulová} and Michaela {Krejčí Kotlánová} and Dana {Kubátová} and Theodor {Staněk} and Zdeněk {Krejza} and Dalibor {Všianský} and Radoslav {Novotný} and Jakub {Palovčík} and Karel {Dvořák}",
  title="Early hydration of C4AF with silica fume and its role on katoite composition",
  journal="Journal of Microscopy",
  year="2024",
  volume="28.2.2024",
  number="28.2.2024",
  pages="1--9",
  doi="10.1111/jmi.13280",
  issn="1365-2818",
  url="https://onlinelibrary.wiley.com/doi/full/10.1111/jmi.13280"
}