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Analysis of shear rate inside a concrete truck mixer

Analysis of shear rate inside a concrete truck mixer


Title: Analysis of shear rate inside a concrete truck mixer
Author: Wallevik, Jon Elvar
Wallevik, Olafur Haralds
Date: 2017-05
Language: English
Scope: 9-17
University/Institute: Háskólinn í Reykjavík
Reykjavik University
School: Tækni- og verkfræðideild (HR)
School of Science and Engineering (RU)
ISSN: 0008-8846
1873-3948 (eISSN)
DOI: 10.1016/j.cemconres.2017.02.007
Subject: Truck mixer; Shear rate; Fresh concrete; Rheology; Finite volume method; Fluid mechanics; Fluid dynamics; Cement; Steinsteypa; Sement; Straumfræði; Hreyfifræði; Bútaaðferð
URI: https://hdl.handle.net/20.500.11815/1591

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Citation:

Wallevik, J. E., & Wallevik, O. H. (2017). Analysis of shear rate inside a concrete truck mixer. CEMENT AND CONCRETE RESEARCH, 95, 9–17. https://doi.org/10.1016/j.cemconres.2017.02.007

Abstract:

In addition to the mixing energy applied to the fresh concrete (i.e. shearing during mixing), the shear history after mixing is also important. This applies especially to binder rich concretes like the different types of high performance concrete (HPC). With this in mind, the shear rate is analyzed inside a drum of a concrete truck mixer. The objective is to better understand the effect of transport of fresh concrete, from the ready mix plant to the building site. The analysis reveals the effect of different drum charge volume and drum rotational speed. Also, the effect of yield stress and plastic viscosity is investigated. The work shows that the shear rate decreases in an exponential manner with increasing drum charge volume. It is also shown that for a given drum speed, the shear rate decreases both with increasing plastic viscosity and yield stress.

Rights:

This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).

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