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Development of Rheo-IR: Combination of a Strain-Controlled Rheometer with an IR Spectrometer for in-situ Mechanical and Chemical Analysis of Cement Paste

Radebe, Nonkululeko Winnie 1
1 Institut für Technische Chemie und Polymerchemie (ITCP), Karlsruher Institut für Technologie (KIT)

Abstract (englisch):

Fourier-transform infrared (FTIR) spectroscopy is a common tool for determining the chemical composition of a material in the solid, liquid, or gas phases, both qualitatively and quantitatively. It is also employed as a technique for monitoring the rate of chemical changes as a function of time, concentration, temperature etc. These chemical changes can have rheological implications, such as polymerization kinetics, rubber crosslinking, or epoxy curing, to name a few. In this thesis, a unique set-up that is able to simultaneously measure rheology and IR spectra with an improved sensitivity, to correlate mechanical behavior with microstructural changes, was developed. The stepwise development of chemically and mechanically sensitive Rheo-IR set-up is presented. This includes the design of an IR transparent upper-plate rheological geometry used as an attenuated total reflectance (ATR) sampling tool and a description of the technical and methodological adaption of the ATR crystal into an ARES G2 rheometer. In this new set-up, a strain-controlled rheometer is combined in a novel configuration with an ATR crystal and the IR beam is guided through two off-axis parabolic mirrors to the quasi-static upper plate of the rheometer to gain maximum IR sensitivity. ... mehr


Volltext §
DOI: 10.5445/IR/1000143813
Veröffentlicht am 28.03.2022
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Technische Chemie und Polymerchemie (ITCP)
Publikationstyp Hochschulschrift
Publikationsdatum 28.03.2022
Sprache Englisch
Identifikator KITopen-ID: 1000143813
Verlag Karlsruher Institut für Technologie (KIT)
Umfang x, 161 S.
Art der Arbeit Dissertation
Fakultät Fakultät für Chemie und Biowissenschaften (CHEM-BIO)
Institut Institut für Technische Chemie und Polymerchemie (ITCP)
Prüfungsdatum 17.12.2021
Schlagwörter cement paste, Rheo-IR, hydrogel formation, ettringite, calcium silicate hydrate
Referent/Betreuer Wilhelm, Manfred
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