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Microstructural investigation of portland cement mortars containing varying dosages of polynaphthalene sulfonate superplasticizer
The effect of varying dosages of a polynaphthalene sulfonate (PNS) superplasticizer on the microstructure of a portland cement paste, and on the microstructural and transition zone characteristics of a portland cement mortar, was investigated using AC impedance spectroscopy. Interpretation of the impedance and resistivity data was carried out in conjunction with data from mercury intrusion porosimetry, scanning electron microscopy, and other techniques. The addition of the PNS superplasticizer influences both the cement paste/sand interfacial region and the bulk paste component in the mortar. The transition zone was more porous at early hydration (around 4 hours) for mortars with high dosages of superplasticizer. The dosage levels also influences the morphology of the hydrates. Larger high frequency arcs and higher electrical resistance values were obtained for all the superplasticized mortars at one day and beyond. This suggests a modification in the pore structure and porosity of both the transition zone and the bulk paste due to presence of the superplasticizer. Mercury porosimetry, thermogravimetry and conduction calorimetry measurements support the interpretation of the AC impedance spectra.
Microstructural investigation of portland cement mortars containing varying dosages of polynaphthalene sulfonate superplasticizer
The effect of varying dosages of a polynaphthalene sulfonate (PNS) superplasticizer on the microstructure of a portland cement paste, and on the microstructural and transition zone characteristics of a portland cement mortar, was investigated using AC impedance spectroscopy. Interpretation of the impedance and resistivity data was carried out in conjunction with data from mercury intrusion porosimetry, scanning electron microscopy, and other techniques. The addition of the PNS superplasticizer influences both the cement paste/sand interfacial region and the bulk paste component in the mortar. The transition zone was more porous at early hydration (around 4 hours) for mortars with high dosages of superplasticizer. The dosage levels also influences the morphology of the hydrates. Larger high frequency arcs and higher electrical resistance values were obtained for all the superplasticized mortars at one day and beyond. This suggests a modification in the pore structure and porosity of both the transition zone and the bulk paste due to presence of the superplasticizer. Mercury porosimetry, thermogravimetry and conduction calorimetry measurements support the interpretation of the AC impedance spectra.
Microstructural investigation of portland cement mortars containing varying dosages of polynaphthalene sulfonate superplasticizer
Untersuchung der Mikrostruktur von Portland-Zementmörtel mit verschiedenen Gehalten des Superplastifizierungsmittels Polynaphthalinsulfonat
Xu, G. (author) / Beaudoin, J.J. (author) / Jolicoeur, C. (author) / Page, M. (author)
1999
22 Seiten, 13 Bilder, 3 Tabellen, 26 Quellen
Conference paper
English
| British Library Conference Proceedings | 1999
Effects of fineness of cement on polynaphthalene sulfonate based superplasticizer–cement interaction
| Online Contents | 2009
Effects of fineness of cement on polynaphthalene sulfonate based superplasticizer-cement interaction
| British Library Online Contents | 2009
Effects of fineness of cement on polynaphthalene sulfonate based superplasticizer–cement interaction
| Online Contents | 2009