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Efficient approach to measuring strength and deformation of passively confined concrete

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Abstract

This paper presents a novel experimental method developed to determine the increase in concrete strength and the evolution of both axial and lateral deformation under confined compression. In contrast to expensive and time-consuming triaxial experiments, the present method requires only a uniaxial testing machine with displacement control. In the proposed setup, a concrete cylinder is surrounded by metal rings, which are activated by the lateral expansion of concrete and provide passive confinement. The magnitude of confinement can be easily controlled by the dimensions and spacing of the rings. In contrast to triaxial tests, the stress history is much closer to that encountered in real structural members. The most suitable measuring setup is a combination of conventional and non-contact measurements, namely of the vertical extensometers for the axial strain and digital image correlation for the hoop strain. The results indicate that the lateral deformation needs to be averaged over a representative volume as its distribution over the height of the specimen becomes highly nonuniform in the postpeak. The proposed setup was successfully verified on 20 concrete cylinders with 4 different ring layouts. The measured strength increase due to confinement is consistent with models from the literature and thus with triaxial tests that were used for their development and calibration. The experimental scatter decreases with increasing magnitude of confinement and decreasing spacing of the rings.

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Funding

Financial support for this work was provided by the Czech Science Foundation (GA ČR), Project number 19-25312S (Compression tests with confinement for advanced modeling of concrete columns).

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Authors and Affiliations

  1. Department of Mechanics, Faculty of Civil Engineering, Czech Technical University in Prague, Thákurova 7, 166 29, Prague, Czech Republic

    Petr Havlásek, Petr Bittnar, Pavel Padevět, Milan Jirásek & Zdeněk Bittnar

  2. Department of Physics, Faculty of Civil Engineering, Czech Technical University in Prague, Thákurova 7, 166 29, Prague, Czech Republic

    Václav Nežerka

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  1. Petr Havlásek
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Contributions

PH: Conceptualization, methodology, formal analysis, data duration, writing—original draft, visualization, VN: Investigation, writing—original draft, PB: investigation, PP: investigation, MJ: conceptualization, writing—review and editing, ZB: conceptualization, project administration.

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Correspondence to Petr Havlásek.

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Havlásek, P., Nežerka, V., Bittnar, P. et al. Efficient approach to measuring strength and deformation of passively confined concrete. Mater Struct 56, 166 (2023). https://doi.org/10.1617/s11527-023-02255-0

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