Mössbauer and calorimetric studies of portland cement hydration in the presence of black gram pulse

Rai, Sarita; Kurian, Sajith; Dwivedi, V. N.; Das, S. S.; Singh, N. B.; Gajbhiye, N. S.

doi:10.1007/978-3-540-78697-9_173

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“…Dwivedi et al [22], Rai et al [23], and Singh et al [24] have proved using the Mössbauer effect the delaying effect on the cement hydration of black gram pulse and superplasticizer, while Barathan et al [25] have studied the hydration of Portland cement with addition of silica fume and have registered the transformation AFt → AFm.…”

Section: Introductionmentioning

confidence: 99%

Mössbauer, XRD, and Complex Thermal Analysis of the Hydration of Cement with Fly Ash

Lilkov

Petrov

Tzvetanova

et al. 2013

Journal of Spectroscopy

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Hydration of cement with and without fly ash is studied with Mössbauer spectroscopy, XRD, and thermal analysis. Iron in cement is present as Fe3+-ions and occupies two octahedral positions, with close isomer shifts and quadrupole splittings. Iron in fly ash is present as Fe2+and Fe3+, and the Mössbauer spectra display three doublets—two for Fe3+in octahedral coordination and one for Fe2+. A third doublet was registered in the hydrating plain cement pastes after the 5th day, due to Fe3+in tetrahedral coordination in the structure of the newly formed monosulphate aluminate. In cement pastes with fly ash, the doublet of tetrahedral iron is formed earlier because the quantity of ettringite and portlandite is low and more monosulphate crystallizes. No Fe(OH)3phase forms during hydration of C4AF. The fly ash displays pozzolanic properties, which lead to lowering of the portlandite quantity in the cement mixtures and increasing of the high temperature products.

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Section: Introductionmentioning

confidence: 99%