A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Chemical mapping of thaumasite formed in sulfate-attacked cement mortar using near-infrared Raman imaging microscopy
This work reports a new method for identifying and mapping the distributions of both thaumasite and ettringite in cement using near-infrared Raman imaging microscopy (NIRIM). This technique offers an important alternative to conventional X-ray diffraction (XRD) and scanning electron microscopy (SEM), which cannot easily distinguish preexisting ettringite from thaumasite formed as the result of sulfate attack. The NIRIM instrument used for these studies combines fiber-bundle image compression (FIC) hardware and multivariate signal processing software to identify and map chemical species in cement samples produced with and without extended exposure to sulfate. The NIRIM images clearly reveal thaumasite, ettringite, and gypsum microstructures. Cement paste formed in a carbon dioxide environment is found to contain both ettringite and gypsum species, while NIRIM images of cement exposed to sulfate reveals only thaumasite and gypsum. The NIRIM results are shown to correlate well with combined SEM/X-ray microanalysis of the same samples.
Chemical mapping of thaumasite formed in sulfate-attacked cement mortar using near-infrared Raman imaging microscopy
This work reports a new method for identifying and mapping the distributions of both thaumasite and ettringite in cement using near-infrared Raman imaging microscopy (NIRIM). This technique offers an important alternative to conventional X-ray diffraction (XRD) and scanning electron microscopy (SEM), which cannot easily distinguish preexisting ettringite from thaumasite formed as the result of sulfate attack. The NIRIM instrument used for these studies combines fiber-bundle image compression (FIC) hardware and multivariate signal processing software to identify and map chemical species in cement samples produced with and without extended exposure to sulfate. The NIRIM images clearly reveal thaumasite, ettringite, and gypsum microstructures. Cement paste formed in a carbon dioxide environment is found to contain both ettringite and gypsum species, while NIRIM images of cement exposed to sulfate reveals only thaumasite and gypsum. The NIRIM results are shown to correlate well with combined SEM/X-ray microanalysis of the same samples.
Chemical mapping of thaumasite formed in sulfate-attacked cement mortar using near-infrared Raman imaging microscopy
Jallad, K.N. (author) / Santhanam, M. (author) / Cohen, M.D. (author) / Ben-Amotz, D. (author)
Cement and Concrete Research ; 31 ; 953-958
2001
6 Seiten, 19 Quellen
Article (Journal)
English
| British Library Online Contents | 2001
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