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| Naji, M. |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Petrov, R. H. | Madrid |
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| Azam, Siraj |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Biesemans, Monique
in Cooperation with on an Cooperation-Score of 37%
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Publications (7/7 displayed)
- 2008Undecyltin trichloride grafted onto cross-linked polystyrenecitations
- 2007Reaction mechanism, kinetics and high temperature transformations of geopolymers
- 2007Formation, molecular structure and thermal properties of geopolymers
- 2007Thermal hardening and structure of a phosphorus containing cementitious model materialcitations
- 2007Thermal hardening and stucture of a phosphorus containing cementitious model material: Phosphoric acid-wollastonite
- 2004Wollastonite-phosphoric acid: a modelsystem for fast hardening cements
- 2004Wollastonite-phosphoric acid: a model system for fast hardening cements
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article
Thermal hardening and stucture of a phosphorus containing cementitious model material: Phosphoric acid-wollastonite
Abstract
The reaction of phosphoric acid with wollastonite has been studied for reaction mixtures with a molar ratio r = P/Ca from 0.39 up to 2.9. X-Ray Diffraction and Fourier Transform Infrared Spectroscopy (FT-IR) reveal the formation of the crystalline products brushite (when r is smaller than 1.4) and monetite and calcium dihydrogenphosphate mono hydrate (when r is above 1). Magic Angle Spinning Nuclear Magnetic Resonance Spectroscopy and FT-IR show that amorphous silica is also formed which contains some residual calcium and hydroxyl groups. The proposed reactions are confirmed by the evolution of the reaction enthalpy measured with Differential Scanning Calorimetry (DSC). The reaction was monitored with Modulated Temperature DSC and Dynamic Mechanical Analysis. The sharp increase of the elasticity modulus coincides with the onset of decrease in heat capacity. The setting of the reaction mixture does not slow down the reaction rate.