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Application of Fourier transform infrared spectroscopy in cement Alkali quantification

Nasrazadani, S. / Springfield, T.

Abstract Alkali in cement is responsible for the Alkali–silica-reaction phenomenon that manifests itself in the form of premature cracking in concrete structures such as bridge decks and concrete pavements. X-ray fluorescence spectroscopy (XRF) is commonly used for cement Alkali quantification but a simpler and faster analytical procedure based on Fourier transform infrared spectroscopy (FTIR) has been expanded for this purpose. An analytical absorption band at 750 cm−1 in the FTIR spectra of cement samples belonging to Alkali solid solution of tricalcium aluminate [C3A(ss)] is used for Alkali quantification. Regression analysis of a plot correlating FTIR absorption band area ratio (750/923 cm−1) to equivalent Alkali Na2O e (Na2O e = % Na2O + 0.658 × % K2O) measured by XRF shows a linear correlation coefficient, R 2, of 0.97. High Alkali cement samples show a higher microstructural disorder coefficient, C d, which is a reactivity criterion introduced by Bachiorrini and co-authors (Proceedings of the seventh international conference on concrete alkali-aggregate reactions‚ 1986) for ASR-susceptible aggregates. Results of this research indicate applicability of FTIR technique to quantitatively predict cement vulnerability to ASR through the $A_{750 {cm}^{- 1}}$ to $A_{923 {cm}^{- 1}}$ band area ratio and the magnitude of the disorder coefficient (C d).

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Application of Fourier transform infrared spectroscopy in cement Alkali quantification

Nasrazadani, S. / Springfield, T.

Abstract Alkali in cement is responsible for the Alkali–silica-reaction phenomenon that manifests itself in the form of premature cracking in concrete structures such as bridge decks and concrete pavements. X-ray fluorescence spectroscopy (XRF) is commonly used for cement Alkali quantification but a simpler and faster analytical procedure based on Fourier transform infrared spectroscopy (FTIR) has been expanded for this purpose. An analytical absorption band at 750 cm−1 in the FTIR spectra of cement samples belonging to Alkali solid solution of tricalcium aluminate [C3A(ss)] is used for Alkali quantification. Regression analysis of a plot correlating FTIR absorption band area ratio (750/923 cm−1) to equivalent Alkali Na2O e (Na2O e = % Na2O + 0.658 × % K2O) measured by XRF shows a linear correlation coefficient, R 2, of 0.97. High Alkali cement samples show a higher microstructural disorder coefficient, C d, which is a reactivity criterion introduced by Bachiorrini and co-authors (Proceedings of the seventh international conference on concrete alkali-aggregate reactions‚ 1986) for ASR-susceptible aggregates. Results of this research indicate applicability of FTIR technique to quantitatively predict cement vulnerability to ASR through the $A_{750 {cm}^{- 1}}$ to $A_{923 {cm}^{- 1}}$ band area ratio and the magnitude of the disorder coefficient (C d).

Application of Fourier transform infrared spectroscopy in cement Alkali quantification

Nasrazadani, S. / Springfield, T.

Abstract Alkali in cement is responsible for the Alkali–silica-reaction phenomenon that manifests itself in the form of premature cracking in concrete structures such as bridge decks and concrete pavements. X-ray fluorescence spectroscopy (XRF) is commonly used for cement Alkali quantification but a simpler and faster analytical procedure based on Fourier transform infrared spectroscopy (FTIR) has been expanded for this purpose. An analytical absorption band at 750 cm−1 in the FTIR spectra of cement samples belonging to Alkali solid solution of tricalcium aluminate [C3A(ss)] is used for Alkali quantification. Regression analysis of a plot correlating FTIR absorption band area ratio (750/923 cm−1) to equivalent Alkali Na2O e (Na2O e = % Na2O + 0.658 × % K2O) measured by XRF shows a linear correlation coefficient, R 2, of 0.97. High Alkali cement samples show a higher microstructural disorder coefficient, C d, which is a reactivity criterion introduced by Bachiorrini and co-authors (Proceedings of the seventh international conference on concrete alkali-aggregate reactions‚ 1986) for ASR-susceptible aggregates. Results of this research indicate applicability of FTIR technique to quantitatively predict cement vulnerability to ASR through the $A_{750 {cm}^{- 1}}$ to $A_{923 {cm}^{- 1}}$ band area ratio and the magnitude of the disorder coefficient (C d).

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Title:

Application of Fourier transform infrared spectroscopy in cement Alkali quantification

Contributors:

Nasrazadani, S. (author) / Springfield, T. (author)

Published in:

Materials and Structures ; 47 ; 1607-1615

Publication date:

2013-07-16

Size:

9 pages

ISSN:

1871-6873 , 1359-5997

DOI:

https://doi.org/10.1617/s11527-013-0140-3

Type of media:

Article (Journal)

Type of material:

Electronic Resource

Language:

English

Keywords:

Spectroscopy , X-ray diffraction , Alkali–silica-reaction , Expansion , Alkalis , Concrete Engineering , Structural Mechanics , Materials Science, general , Theoretical and Applied Mechanics , Operating Procedures, Materials Treatment , Civil Engineering , Building Materials

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