Abstract

Self-Compacting Concrete is a New Type of Concrete Which is More Liquid Compared to Traditional Concrete and Which Does Not Need Any Form of External Compaction. as a Result, This Type of Concrete is Suitable for a New Placing Technique: Pumping SCC from the Bottom in the Formwork and Letting It Rise in the Formwork Due to the Applied Pressure. in Order to Understand the Phenomena Occurring during Pumping Operations, the Rheological Properties of SCC Must Be Investigated and Controlled. Tests Have Been Performed with Two Different Rheometers, Which Are Described in This Paper. for the Tattersall MIk-II Rheometer, a Calibration Procedure Has Been Worked Out to Eliminate Secondary Flows in the Rheometer. Test Results Indicate that SCC is a Thixotropic Liquid, having a Yield Stress, Showing Shear Thickening and Having Varying Properties in Time Due to the Occurring Chemical Reactions. in This Paper, the Time Dependent Effects Will Not Be Described. When Trying to Apply a Rheological Model to the Obtained Results, Only the Modified Bingham Model Seems Appropriate. Applying the Bingham Model Results in the Generation of Negative Yield Stresses While the Herschel-Bulkley Model Has a Parameter with a Variable Dimension and Has a Major Mathematical Restriction. the Rheological Properties of Fresh SCC Can Be Described with the Modified Bingham Model. a Suitable Parameter to Describe Shear Thickening is Defined as the Ratio of the Second Order Term in the Shear Rate of the Modified Bingham Model to the Linear Term (= C/μ). © Appl. Rheol.

Department(s)

Civil, Architectural and Environmental Engineering

Keywords and Phrases

Bingham model; Concrete; Herschel-Bulkley model; Self-compacting concrete; Tattersall rheometer

International Standard Serial Number (ISSN)

1430-6395

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2023 De Gruyter, All rights reserved.

Publication Date

01 Jan 2007

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