Concrete alteration due to 55 years of exposure to river water: Chemical and mineralogical characterisation
| Autor: | Martin Rosenqvist, Manouchehr Hassanzadeh, Katja Fridh, Alexandra Bertron |
|---|---|
| Přispěvatelé: | Laboratoire Matériaux et Durabilité des constructions (LMDC), Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées, Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT) |
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
Ettringite
Aggregate (composite) Scanning electron microscope 0211 other engineering and technologies Mineralogy 020101 civil engineering 02 engineering and technology Building and Construction Electron microprobe 6. Clean water 0201 civil engineering Waterline Thermogravimetry symbols.namesake chemistry.chemical_compound [SPI]Engineering Sciences [physics] chemistry 13. Climate action 021105 building & construction symbols General Materials Science Soft water Precipitation Geology |
| Zdroj: | Cement and Concrete Research Cement and Concrete Research, Elsevier, 2017, 92, pp.110--120. ⟨10.1016/j.cemconres.2016.11.012⟩ Cement and Concrete Research, 2017, 92, pp.110--120. ⟨10.1016/j.cemconres.2016.11.012⟩ |
| ISSN: | 0008-8846 |
| DOI: | 10.1016/j.cemconres.2016.11.012⟩ |
| Popis: | This article presents a study on concrete alteration mechanisms due to 55 years of exposure to river water. Many hydro power structures in cold regions suffer from concrete deterioration at the waterline. Progressive disintegration of the concrete surface leads to exposure of the coarse aggregate and eventually the reinforcing steel. Concrete cylinders drilled out at four vertically different locations on the upstream face of a concrete dam were analysed by electron microprobe analysis, X-ray diffraction, thermogravimetry and scanning electron microscopy. Long-term exposure to the river water, which is regarded as soft water, has led to chemical and mineralogical zonation of the cement paste. Up to five zones with different chemical and mineralogical composition, parallel to the upstream face, were observed in the outermost 8–9 mm of the concrete. Decalcification, precipitation of secondary ettringite and the formation of a magnesium-rich silica gel constitute the major changes that define the zones. |
| Databáze: | OpenAIRE |
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