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Title: Concrete Shear Box: New Instrument to Assess Stiff to Flowing Concrete Using Bingham Model

Author(s): Girish Shamanna, Ajay Nagaraj, and Akanksha Achutha

Publication: Materials Journal

Volume: 118

Issue: 6

Appears on pages(s): 227-240

Keywords: Bingham model; concrete rheology; concrete shear box; modified Bingham model; rheometer; self-consolidating concrete (SCC)

Date: 11/1/2021

Abstract:
The characterization and control of flow properties of present concrete are most critical due to the wide choice of ingredients with different characteristics. A rheological-based scientific approach is needed to overcome the deficiencies of empirical tests. This study has clearly brought out the effective use of the concrete shear box as an additional instrument in finding the rheological properties of very stiff to flowing concrete. The procedure for finding the rheological properties is unique and shows the existence of the limiting value of slump flow in using the Bingham model at a higher flowability of self-consolidating concrete. Results are consistent and clearly show a correlation between the slump flow and yield stress and the importance of the volume of paste and the use of multiple linear regression analysis in understanding the combined influence of ingredients. The study implies the design of self-consolidating concrete mixtures based on rheological properties for different slump flow values.


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