Method of Estimating Plastic Viscosity of Cement Paste, Mortar, and Concrete Containing a Chemical Admixture

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Title: Method of Estimating Plastic Viscosity of Cement Paste, Mortar, and Concrete Containing a Chemical Admixture

Author(s): H. Kikukawa and T. lisaka

Publication: Special Publication

Volume: 217

Issue:

Appears on pages(s): 161-176

Keywords: air-entraining admixture; chemical admixture; plastic viscosity; viscosity equation

Date: 9/1/2003

Abstract:
An equation was formulated for estimating the plastic viscosity of cement paste containing an air-entraining admixture, which is a commonly used chemical admixture for concrete. Air-entraining admixtures slightly increase the plastic viscosity of neat cement paste. The viscosity equation was derived by incorporating this effect, to minimize the difference between the estimation and measurement. The ratio of the plastic viscosity estimated from the proposed viscosity equation to the measured plastic viscosity was found to be approximately 1, the anticipated value. Viscosity equations for mortar and concrete also formulated based on an existing viscosity equation were found to be valid even when the plastic viscosity of the matrix changed.