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Rheological behaviour of fresh concrete in continuous pumping and circuit-breakdown cases

Part 2: Results and discussion


This paper focuses on the influence of concrete composition on its rheological properties and pumpability. The pressure and flow rate results obtained for distinct concrete mixtures from the Sliding Pipe Rheometer (Sliper) are confronted with the rheological parameters obtained from a rotational viscometer and empirical tests. The characteristic differences in rheology and pumpability of ordinary concrete (OC) with rounded and crushed aggregates, self-compacting concrete (SCC) and strain-hardening cement-based composites (SHCC) are explored. In particular, the influence of pauses, i.e. blockages or temporary circuit breakdowns, on the pumpability of concrete are investigated by means of two cases: a) concrete is being continuously mixed between the testing series; b) concrete is left at rest between the testing series, thus representing pauses during pumping. In Part 1 of the publication (CPI 5/15), the rheological principles of the concrete pumping process were presented and the experimental programme was described. In Part 2 of the publication (this paper), the experimental results are discussed and analysed.

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Technische Universität Dresden
01062 Dresden, Germany

Schleibinger Geräte Teubert u. Greim GmbH
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84428 Buchbach, Germany
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CPi worldwide journals are trade journals for the concrete and precast concrete industry that are published in 10 different language editions in more than 170 countries. These trade journals, with their practical editorial reporting on research, production and applications, are specifically addressing the decision makers of the concrete and precast concrete industry.

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