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- Title
Mineralogical evolution of cement pastes at early ages based on thermogravimetric analysis (TG).
- Authors
Gaviria, Ximena; Borrachero, María Victoria; Payá, Jordi; Monzó, José María; Tobón, Jorge Iván
- Abstract
Ordinary thermogravimetric analysis (TG) and high-resolution TG tests were carried out on three different Portland cement pastes to study the phases present during the first day of hydration. Tests were run at 1, 6, 12 and 24 h of hydration, in order to determine the phases at these ages. High-resolution TG tests were used to separate decompositions presented in the 100-200 °C interval. The non-evaporable water determined by TG was used to determine hydration degree for the different ages. The effect of particle size distribution (PSD) on mineralogical evolution was established, as well as the addition of calcite as mineralogical filler. Finer PSD and calcite addition accelerate the hydration process, increasing the hydration degree on the first day of reaction between water and cement. According to high-resolution TG results, it was demonstrated that ettringite was the only decomposed phase in the 100-200 °C interval during the first 6 h of hydration for all studied cements. C-S-H phase starts to appear in all cements after 12 h of hydration.
- Subjects
THERMOGRAVIMETRY; HYDRATION; CHEMICAL decomposition; ETTRINGITE; RESOLUTION (Chemistry)
- Publication
Journal of Thermal Analysis & Calorimetry, 2018, Vol 132, Issue 1, p39
- ISSN
1388-6150
- Publication type
Article
- DOI
10.1007/s10973-017-6905-0