Rheological Estimation of Flowing Mortar with a Superplasticizer


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Title: Rheological Estimation of Flowing Mortar with a Superplasticizer

Author(s): S. Kakuta

Publication: Special Publication

Volume: 173


Appears on pages(s): 407-426

Keywords: Fine aggregates; mortars (materials); rheological properties; superplasticizers; tests

Date: 9/1/1997

The fluidity of self compacting concrete is influenced by the fluidity of the composed mortar. This paper discusses the rheological estimation of the fluidity of highly-flowing mortars with superplasticizers. The character of the fine aggregate is considered the most effective factor on mortar fluidity. The applicability of the viscosity equation proposed by Mori and Ototake for condensed suspension liquids to highly-flowing mortar is discussed. Mortars were tested with different volume concentration of fine aggregate suspended in highly-flowing paste. The result from rheological test using a Brookfield type viscometer indicated good agreement with the equation. Provided that the fluidity of the mortar behaves as a Bingham fluid, it can be estimated by plastic viscosity and yield value. These rheological tests were applied to two types of highly-flowing mortars composed of self-compacting concrete mixtures ranging from 60 ~ 70 cm of slumping flow value. The effects of the fine aggregate fluctuated with differences in water content, sand content and sand grading of the basic mortar. Test result showed that the character of the sand remarkably affects the 5uidity of highly-flowing mortar.