Deteriorated hardened cement paste structure analyzed by XPS and 29Si NMR techniques
| Autor: | Masahito Shibata, Hitoshi Owada, Kiyofumi Kurumisawa, Toyoharu Nawa |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2013 |
| Předmět: |
Cement
Materials science Ammonium nitrate Mineralogy Building and Construction Degree of polymerization Characterization (B) Cement paste Silicate chemistry.chemical_compound chemistry X-ray photoelectron spectroscopy Polymerization Chemical engineering Long-Term Performance (C) General Materials Science Degradation (C) Spectroscopy (B) Calcium-Silicate-Hydrate (C-S-H) (B) |
| Zdroj: | Cement and concrete research. 52(10):190-195 |
| ISSN: | 0008-8846 |
| Popis: | In this report, X-ray photoelectron spectroscopy (XPS) and 29 Si-MAS-NMR was used for the evaluation of deteriorated hardened cement pastes. The deterioration by ammonium nitrate solution was accompanied by changes in the pore structure as well as by structural changes in the C–S–H in the hardened cement paste. The CaO/SiO 2 ratio of the C–S–H decreased with the progress of deterioration, there was also polymerization of the silicate in the C–S–H. It was confirmed that the degree of polymerization of silicate of the C–S–H in hardened cement paste can be determined by XPS. It was also shown that the polymerization depends on the structure of the C–S–H. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect