A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Interaction between Portland cement hydrates and polynaphtalene sulfonates
The ability of tricalcium aluminate hydration products to absorb saturated lime solution, containing various amounts of PNS, with an aqueous polynaphthalene sulfonates (PNS) has been studied by reacting a small excess of solution of sodium aluminate. Using X-ray diffraction, infrared spectroscopy and transmission electron microscopy, it is shown that well defined organomineral intercalation compounds result from the reaction. They can be described as layered double hydroxides where part of the hydroxyl groups have been replaced by the PNS anions. The consequences of the formation of such compounds upon the rheological characteristics in the early hydration period of portland cement is aluminate discussed. Emphasis is laid on the fact that the absorptive behavior of calcium hydrates in the presence of superplasticizers is not at the origin of the occasionally observed abnormal early stiffening. This point is illustrated by the investigation of cases of practical interest, based in particular on the analysis of the pore fluid composition in fresh mortars and pastes.
Interaction between Portland cement hydrates and polynaphtalene sulfonates
The ability of tricalcium aluminate hydration products to absorb saturated lime solution, containing various amounts of PNS, with an aqueous polynaphthalene sulfonates (PNS) has been studied by reacting a small excess of solution of sodium aluminate. Using X-ray diffraction, infrared spectroscopy and transmission electron microscopy, it is shown that well defined organomineral intercalation compounds result from the reaction. They can be described as layered double hydroxides where part of the hydroxyl groups have been replaced by the PNS anions. The consequences of the formation of such compounds upon the rheological characteristics in the early hydration period of portland cement is aluminate discussed. Emphasis is laid on the fact that the absorptive behavior of calcium hydrates in the presence of superplasticizers is not at the origin of the occasionally observed abnormal early stiffening. This point is illustrated by the investigation of cases of practical interest, based in particular on the analysis of the pore fluid composition in fresh mortars and pastes.
Interaction between Portland cement hydrates and polynaphtalene sulfonates
Fernon, V. (author) / Vichot, A. (author) / Le Goanvic, N. (author) / Colombet, P. (author) / Corazza, F. (author) / Costa, U. (author)
1997
24 Seiten, 6 Bilder, 6 Tabellen, 19 Quellen
Conference paper
English
Interaction Between Portland Cement Hydrates and Polynapthalene Sulfonates
| British Library Conference Proceedings | 1997
Clinker minerals of portland cement and their hydrates
| Engineering Index Backfile | 1936
Thermal evolution of hydrates in carbonation-cured Portland cement
| Online Contents | 2018
Thermal evolution of hydrates in carbonation-cured Portland cement
| Springer Verlag | 2018