Effect of Temperature on Oscillatory Shear Behavior of Portland Cement Paste Incorporating Chemical Admixtures
Publication: Journal of Materials in Civil Engineering
Volume 19, Issue 12
Abstract
The construction of reinforced concrete structures in hot weather dictates fast placement of fresh concrete to prevent hot weather concreting difficulties such as rapid loss of workability, pumping problems, acceleration of cement hydration, fast evaporation of mixing water, and forming of cold joints. In this process, the selection of adequate chemical admixtures is of paramount importance. In the current study, the viscoelastic properties of portland cement pastes with a water–cement ratio of 0.35 and 0.50 were investigated at different temperatures in the range of through oscillatory rheological tests conducted using an advanced shear-stress/shear-strain controlled rheometer. The influence of water reducing and retarding admixtures, melamine-based, polycarboxylate-based, and a new generation of polycarboxylate-based high-range water reducing admixtures on the oscillatory rheological properties of cement paste at various temperatures was also examined. The results indicate that the viscoelastic properties of cement paste are highly affected by the admixture type and dosage, and that an improved understanding of the effect of chemical admixtures is needed to mitigate high-temperature concreting problems.
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Information & Authors
Information
Published In
Journal of Materials in Civil Engineering
Volume 19 • Issue 12 • December 2007
Pages: 1090 - 1100
Copyright
© 2007 ASCE.
History
Received: Jan 22, 2007
Accepted: Apr 4, 2007
Published online: Dec 1, 2007
Published in print: Dec 2007
Notes
Note. Associate Editor: Kiang Hwee Tan
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