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A platform for research: civil engineering, architecture and urbanism
Degradation mechanism of frost resistance of cement paste subjected to drying and wetting cycles
Effect of drying and wetting cycles on frost resistance of hardened cement paste was estimated with the CIF test. Drying and wetting cycles degraded the frost resistance of hardened cement paste. Micro-cracks were observed, but its effect on the frost damage was not proven. Change in micro and nanostructure of hardened cement paste subjected to drying and wetting cycles was also studied by means of mercury intrusion porosimetry (MIP), Si-NMR, and H2O sorption isotherm. Micro pores more than 8 nm in diameter increased. The NMR spectra identified that Q0 and Q1 decreased, while Q2 increased, showing the polymerization of silicate anion structure coordinated to the CaO layer. The result of ESW (Excess Surface Work) model for H2O sorption isotherm supported the polymerization of silicate anion structure.
Degradation mechanism of frost resistance of cement paste subjected to drying and wetting cycles
Effect of drying and wetting cycles on frost resistance of hardened cement paste was estimated with the CIF test. Drying and wetting cycles degraded the frost resistance of hardened cement paste. Micro-cracks were observed, but its effect on the frost damage was not proven. Change in micro and nanostructure of hardened cement paste subjected to drying and wetting cycles was also studied by means of mercury intrusion porosimetry (MIP), Si-NMR, and H2O sorption isotherm. Micro pores more than 8 nm in diameter increased. The NMR spectra identified that Q0 and Q1 decreased, while Q2 increased, showing the polymerization of silicate anion structure coordinated to the CaO layer. The result of ESW (Excess Surface Work) model for H2O sorption isotherm supported the polymerization of silicate anion structure.
Degradation mechanism of frost resistance of cement paste subjected to drying and wetting cycles
Degradierungsmechanismus der Frostbeständigkeit einer Zementpaste, Trocknungs- und Benetzungszyklen ausgesetzt
Aono, Y. (author) / Matsushita, F. (author) / Shibata, S. (author) / Hama, Y. (author)
2007
12 Seiten, 14 Bilder, 5 Tabellen, 14 Quellen
Conference paper
English
| Springer Verlag | 1973
| TIBKAT | 1973