6 Materialchemie
Filtern
Erscheinungsjahr
- 2018 (1)
Dokumenttyp
- Beitrag zu einem Tagungsband (1) (entfernen)
Sprache
- Englisch (1) (entfernen)
Referierte Publikation
- nein (1) (entfernen)
Schlagworte
- Cement (1)
- Dye (1)
- Hydration (1)
- Optical Spectroscopy (1)
Organisationseinheit der BAM
- 1 Analytische Chemie; Referenzmaterialien (1) (entfernen)
Organic/inorganic mixtures were prepared from ordinary Portland cement (OPC), water (w/c 0.22), a fluorescent dye in aqueous solution (stable at alkaline pH; BAM-I), and two different comb shape polycarboxylates (PCEs), i.e., high charge (PCE-HC) and low charge (PCE-LC), respectively. Rheological and calorimetric measurements were performed prior to optical studies in order to select PCE concentrations. Absorption and fluorescence spectroscopy of the system OPC + BAM-I (CBAM-I) revealed maxima of dye BAM-I located at 645 nm and 663 nm, respectively. In presence of PCE-HC and PCE-LC, these mixtures displayed a small red shift in reflectance and a faster decrease in intensity compared to studies with CBAM-I; however, only slight differences were observed between the different PCEs. With time, all systems exhibited a decrease in intensity of BAM-I in absorption/reflectance and emission. This could be caused by dye adsorption and possibly decomposition when in contact with cement particles or hydration products.