Triethanolamine (TEA) in hardened cement paste has been analyzed by infrared spectrophotometry. The technique is sensitive for the qualitative detection of small amounts of TEA. However, the percent recovery is very much concentration dependent and, until the reproducibility of the method has been
Analysis of cement pastes for triethanolamine
โ Scribed by M.T. McCall; J. Mannone
- Publisher
- Elsevier Science
- Year
- 1975
- Tongue
- English
- Weight
- 283 KB
- Volume
- 5
- Category
- Article
- ISSN
- 0008-8846
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โฆ Synopsis
This report describes our efforts to analyze cement pastes for triethanolamine. This analysis can be efficiently accomplished after short hydration times (ca. 3 min. ) by gas chromatography or infrared spectroscopy. Only trace amounts of the amine are detected, however, after 24 hours of hydration. The infrared spectrum of the material extracted after 24 hours of hydration is different from that of the amine, suggesting that triethanolamine -cement reactions occur during hydration.
Dieser Bericht beschreibt unsere Bemuhungen, den Triethanolamingehalt yon Zementpasten dutch Analyse zu bestimmen. Solche Analysen, entweder Gas-Chromatographie oder Spektralanalyse im [nfraroten, sind erfolgreich nach nur kurzer (etwa 3 Mill. ) Hydrationszeit. Andererseits werden nach langerer (24 Std. ) Hydrationszeit nut noch Spuren des Amin gefunden. Ferner unterscheidet sich das Spektrum des nach 24 Std. Hydration entzogenen Materials deutlich yon dem Spektrum des urspruglichen Amins.
Somit ergibt sich die Vermutung, dass wahrend der Hydration Triethanolamin-Zement Reaktionen vor sich gehen.
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