Validation of Punching Shear Capacity Predictions for Flat Slabs with Coarse Recycled Aggregate Concrete

Tadeáš Fecko; Ľudmila Kormošová

doi:10.2478/sjce-2026-0017

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Validation of Punching Shear Capacity Predictions for Flat Slabs with Coarse Recycled Aggregate Concrete

Slovak Journal of Civil Engineering

Volume 34 (2026): Issue 3 (September 2026)

By: Tadeáš Fecko and Ľudmila Kormošová

Open Access

|Oct 2026

Abstract

This paper evaluates the experimentally determined punching shear capacities of slab-column connections without any shear reinforcement cast from coarse recycled concrete aggregate concrete (CRCAC). Three series of full-scale slab specimens, comprised of a total of six slabs, with reinforcement ratios of 0.52%, 1.23%, and 1.53%, were tested for their punching behaviour. In each series, one specimen was a reference slab, and the other slab was cast with a 100% replacement of the coarse natural aggregate with coarse recycled aggregate (CRA). During the tests, the slab rotations were recorded and used to calculate the punching shear resistance according to the Critical Shear Crack Theory (CSCT). The calculated punching shear resistances were compared with the experimentally measured values. The results show very good agreement between the experimentally measured and predicted punching shear capacities by CSCT and confirm the negligible effect of CRA on the punching shear behaviour of the slab-column connections tested.

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Articles in this issue

DOI: https://doi.org/10.2478/sjce-2026-0017 | Journal eISSN: 1338-3973 (formerly 1210-3896) | Journal ISSN: 1210-3896 (formerly 1338-3973)

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Language: English

Page range: 48 - 59

Submitted on: Jun 22, 2026

Accepted on: Jun 25, 2026

Published online: Oct 6, 2026

Published in print: Sep 1, 2026

Published by: Slovak University of Technology in Bratislava

In partnership with: Paradigm Publishing Services

Publication frequency: 4 issues per year

Keywords:

punching,

critical shear crack theory,

coarse recycled aggregate,

rotations of flat slabs

Related subjects:

Engineering,

Introductions and overviews,

Engineering, other

© 2026 Tadeáš Fecko, Ľudmila Kormošová, published by Slovak University of Technology in Bratislava
This work is licensed under the Creative Commons Attribution 4.0 License.

Volume 34 (2026): Issue 3 (September 2026)