Deliberate Deformation of Concrete in the Fresh State

Crack Risk and Efficient Production of Curved Precast Elements

Conference Paper (2018)
Author(s)

S Troian (Academy of Sciences of Moldova)

S Grunewald (Universiteit Gent, TU Delft - Steel & Composite Structures)

E. Schlangen (TU Delft - Materials and Environment)

O Copuroglu (TU Delft - Materials and Environment)

Research Group
Steel & Composite Structures
Copyright
© 2018 S Troian, S. Grunewald, E. Schlangen, Oguzhan Copuroglu
DOI related publication
https://doi.org/10.1007/978-3-319-59471-2_287
More Info
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Publication Year
2018
Language
English
Copyright
© 2018 S Troian, S. Grunewald, E. Schlangen, Oguzhan Copuroglu
Research Group
Steel & Composite Structures
Pages (from-to)
2521-2529
ISBN (print)
978-3-319-59470-5
ISBN (electronic)
978-3-319-59471-2
Reuse Rights

Other than for strictly personal use, it is not permitted to download, forward or distribute the text or part of it, without the consent of the author(s) and/or copyright holder(s), unless the work is under an open content license such as Creative Commons.

Abstract

The production of double-curved precast concrete elements for cladding or shell structures requires expensive CNC (computer numerical control)-milled formwork. As an alternative method, the innovative flexible mould for economically efficient and sustainable production of such elements is discussed in this paper. This method comprises the use of a flexible, CNC-controlled formwork, which is filled with self-compacting concrete. After a short period of thixotropic stabilization in the fresh state, the flexible mould is then deformed into its desired geometry, typically having a strong curvature radius of only a few metres in one or two direction(s). After hardening and de-moulding, the flexible mould can be reused for elements with the same or different curved geometry. The present paper describes the outcomes of a study focussing on two aspects relevant for the abovementioned production method: effect of change of rheological properties in the first 90 min after casting and assessment of the risk of cracking and development of cracks during the deformation process. In an experimental study the following parameters were modified: radius of deformation, moment of deformation in time, panel thickness and water-cement ratio. The presence of cracks after deformation was investigated quantitatively, using a petrographic technology. The results show that for the application of the flexible mould method the plastic stage of concrete is important to be considered.

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