Characterisation of concrete pumping behaviour

Author(s): Egor Secrieru, Viktor Mechtcherine
Paper category: Proceedings
Book title: SynerCrete’18: Interdisciplinary Approaches for Cement-based Materials and Structural Concrete: Synergizing Expertise and Bridging Scales of Space and Time Vol. 1 & 2
Editor(s): Miguel Azenha, Dirk Schlicke, Farid Benboudjema, Agnieszka Jędrzejewska
ISBN: 978-2-35158-202-2
e-ISBN: 978-2-35158-203-9
Publisher: RILEM Publications SARL
Publication year: 2018
Pages: 123-128
Total Pages: 6
Language : English

Abstract: Pumping is a widely and effectively used transportation and placing method for fresh cement- based materials. Despite the immense progress in the field of concrete technology in the last decades, including the application of additive manufacturing, so far there are still no official regulations to be used for the assessment and accurate prediction of concrete pumping behaviour. The design of a concrete pumping process becomes especially challenging when high performance concretes including highly viscous high-strength or self-compacting suspensions are involved.
In the present research, the pumping behaviour of concrete is characterised using state of the art rheological and numerical tools. The concrete mixtures under investigation exhibit various principal flow types which are already defined at low flow rates: partial bulk shear in a conventional vibrated concrete and pronounced bulk shear in the case of a self-compacting concrete (SCC). The obtained results are validated in full-scale pumping experiments. The pressure-flow rate curves serve as a reliable pumpability indicator for comparison between predicted results from experimental methods with tribometer/viscometer and Sliper devices, simulations with computational fluid dynamics (CFD) and actual results from full-scale tests.

Online publication : 2018
Publication type : full_text
Public price (Euros) : 0.00