Hydration products in sulfoaluminate cements: Evaluation of amorphous phases by XRD/solid-state NMR
- Dipartimento di Scienze ed Innovazione Tecnologica, Università del Piemonte Orientale A. Avogadro, Viale T. Michel 11, 15121, Alessandria (Italy)
- Wilhelm Dyckerhoff Institut für Baustofftechnologie, Dyckerhoffstraße 7, 65203 Wiesbaden (Germany)
- Buzzi Unicem S.p.A, Via L. Buzzi 6, 15033 Casale Monferrato, Alessandria (Italy)
The hydration of four sulfoaluminate cements have been studied: three sulfoaluminate systems, having different content of sulfate and silicate, and one blend Portland-CSA-calcium sulfate binder. Hydration was followed up to 90 days by means of a combination of X-ray diffraction and solid state MAS-NMR; Differential scanning calorimetry and Scanning electron microscopy were also performed in order to help the interpretation of experimental data. High amount of amorphous phases were found in all the four systems: in low-sulfate cements, amorphous part is mainly ascribed to monosulfate and aluminium hydroxide, while strätlingite is observed if belite is present in the cement; in the blend system, C-S-H contributes to the amorphous phase beyond monosulfate.
- OSTI ID:
- 22697091
- Journal Information:
- Cement and Concrete Research, Journal Name: Cement and Concrete Research Vol. 90; ISSN 0008-8846; ISSN CCNRAI
- Country of Publication:
- United States
- Language:
- English
Similar Records
Hydration of Portland cement with additions of calcium sulfoaluminates
Hydration behavior of cements with reduced clinker factor in mixture with sulfoaluminate binder