A monoclinic tricalcium aluminate (C3A) phase in a commercial Portland cement clinker

Varma, S. P.; Wall, C.D.

doi:10.1016/0008-8846(81)90086-7

Cited by 6 publications

(1 citation statement)

References 7 publications

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“…Tricalcium aluminate is formed by a solid-solid reaction between CaO and Al 2 O 3 indirectly through the phases, with various ratios between CaO and Al 2 O 3 . Despite longterm application, there is still no consensus regarding the kinetic and mechanistic aspects of its formation [22][23][24].…”

Section: Introductionmentioning

confidence: 99%

Formation, Stability, and Crystallinity of Various Tricalcium Aluminate Polymorphs

Ravaszová,

Dvořák,

Boháč

et al. 2024

Materials

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Tricalcium aluminate is an important phase of Portland clinker. In this paper, three polymorphs of C3A were prepared by means of the solid-state synthesis method using intensive milling of the raw material mixture which was doped with various amounts of Na2O and sintered at a temperature of 1300 °C for 2 h. The final products were evaluated through X-ray diffraction using Rietveld analysis. The effect of the Na dopant content on the change in the crystalline structure of tricalcium aluminate was studied. It was proven that the given preparation procedure, which differed from other studies, was close to the real conditions of the formation of Portland clinker, and it was possible to prepare a mixture of different polymorphs of calcium aluminate. Fundamental changes in the crystal structure occurred in the range of 3–4% Na, when the cubic structure changes to orthorhombic. At a dosage of Na dopant above 4%, the orthorhombic structure changes to a monoclinic structure. There are no clearly defined boundaries for the existence of individual C3A phases; these phases arise at the same time and overlap each other in the areas of their formation at different Na doses.

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Section: Introductionmentioning

confidence: 99%