In-situ reaction of the very early hydration of C3A-gypsum-sucrose system by Micro-Raman spectroscopy
| Autor: | Rocio Gutierrez-Contreras, Sagrario Martínez-Ramírez, Nuria Husillos-Rodriguez, Lucía Fernández-Carrasco |
|---|---|
| Přispěvatelé: | Comunidad de Madrid, European Commission |
| Rok vydání: | 2016 |
| Předmět: |
Ettringite
Sucrose Gypsum Carbonation Inorganic chemistry 0211 other engineering and technologies Nucleation Salt (chemistry) Hydration chemical and pharmacologic phenomena 02 engineering and technology engineering.material chemistry.chemical_compound Adsorption Desorption 021105 building & construction General Materials Science chemistry.chemical_classification Admixtures Building and Construction Ca3Al2O6 021001 nanoscience & nanotechnology Micro-Raman chemistry engineering 0210 nano-technology ESEM/EDS |
| Zdroj: | Digital.CSIC. Repositorio Institucional del CSIC instname |
| Popis: | 6 págs.; 7 figs.; 3 tabs.; 1 app. This paper studied in situ, by Micro-Raman spectroscopy, the very early hydration of CA in the presence and absence of sulphates and with sucrose as an additive. For CA hydration in the absence of gypsum, when carbonation is not avoided, carbonate-AFm phases are formed, but in the presence of gypsum, hydroxi-AFm are the main phases. Ettringite is the AFm stable phase developed initially at 70 min of hydration with gypsum and no monosulphate is formed. In the presence of sucrose, this salt, instead of sulphate, is adsorbed over the surface of the CA, avoiding its reaction with sulphates until sucrose desorption. Three hours are necessary to lead to ettringite formation. A nucleation poisoning/adsorption surface mechanism is proposed for added sucrose systems. © 2016 Elsevier Ltd. All rights reserved. The authors wish to thanks the Geomateriales2 Program(S2013/ MIT-2914) supported by the Comunidad de Madrid and EU structural and cohesion funds (FSE and FEDER). |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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