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Home > Publications > International Concrete Abstracts Portal
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
Title: The Influence of Temperature on the Rheological Properties of Superplasticized Cement Pastes
Author(s): Carmel Jolicoeur, Jeff Sharman, Nathalie Otis,
Andree Lebel, Marc-Andre Simard and Monique Page
Publication: Special Publication
Appears on pages(s): 379-406
Keywords: Adsorption; cements; rheological propertis; silica fume; superplasticizers
Abstract:The variation in rheological properties of normal portland cement type-10 and blended silica fume (SF) cement pastes was investigated as a function of temperature (0-40°C) in order to elucidate changes in concrete workability with ambient temperature. The rheological parameters measured included the Kantro mini-slump (spreading areas, S) and the dynamic viscosity (r> at various shear rates as a function of superplasticizer concentration (sodium polynaphthalene sulfonate, PNS). To interpret the changes in fluidity of the cement pastes, the concentration of the superplasticizer in the solution phase was monitored as a function of time measurements also measured of the earlv cement hydration rate (0- 3 hrs) in the pastes were in some cases. (O-2 hrs); calorimetric The variations observed in paste fluidity (S, or l/q) at a given PNS dosage exhibit significant non-linear variations with temperature; the rate of change of S and l/q with time (i.e. slump loss rate) are also found to be non-linear, usually with a maximum value in the interval 5-20°C. The non-linear effects are more pronounced with the SF cement than with the type-10 cement. The observations are interpreted tentatively on the basis of coupled physico-chemical effects involving PNS adsorption on cement and on silica, and the influence of PNS on the early hydration rate.
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