Contributions of the environmental scanning electron microscope and X-ray diffraction in investigating the structural evolution of a SiO2aggregate attacked by alkali-silica reaction
| Autor: | J. Verstraete, L. Khouchaf, M.H. Tuilier |
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| Rok vydání: | 2004 |
| Předmět: |
Diffraction
Materials science Aggregate (composite) Scanning electron microscope Mechanical Engineering 0211 other engineering and technologies 02 engineering and technology 021001 nanoscience & nanotechnology Microanalysis Crystallography Chemical engineering Mechanics of Materials 021105 building & construction X-ray crystallography Alkali–silica reaction General Materials Science 0210 nano-technology Environmental scanning electron microscope Alkali–aggregate reaction |
| Zdroj: | Journal of Materials Science. 39:6221-6226 |
| ISSN: | 0022-2461 |
| DOI: | 10.1023/b:jmsc.0000043590.33303.e0 |
| Popis: | The structural changes of a flint aggregate attacked by alkali-silica reaction (ASR) were investigated using an environmental scanning electron microscope (ESEM) equipped with a X-ray microanalysis system. Compared to the conventional SEM, the ESEM enables the direct imaging of the samples in their natural state. The results obtained are compared to those acquired using X-ray diffraction (XRD). It appears that when calcium is present in the aggregate, the attack takes place from outside and progresses towards the inside of the aggregate. It has also been shown that calcium has an influence in slowing down the reaction by preventing the fast degradation of the aggregate. In addition, it supports the formation of new internal phases in the aggregate. The ESEM and XRD data were found to be consistent with each other. |
| Databáze: | OpenAIRE |
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