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Corrosion risk assessment of structural concrete with coarse crushed concrete aggregate

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posted on 08.03.2018 by Wayne J. Dodds, Chris Goodier, Christian Christodoulou, Simon Austin, D. Dunne
Crushed concrete aggregates (CCA) are an increasingly popular replacement for natural aggregates (NA) in structural concrete due to industry demands for more recycled, low carbon footprint and responsibly sourced materials. There is uncertainty regarding chloride-ion ingress, which can ultimately cause deterioration of reinforced concrete. This is reflected in European and British concrete design standards, which currently exclude CCA in chloride environments. Structural concretes with up to 60% coarse CCA (and CEM I, CEM II/B-V and CEM III/A binders) were exposed to aggressive chloride environments and monitored with electrochemical techniques and subsequent destructive testing to determine their risk of corrosion initiation. The results showed that CEM II/B-V and CEM III/A concretes with up to 60% coarse CCA outperformed the control CEM I concrete with 100% NA, and had a lower risk of corrosion initiation. It is recommended that further monitoring is required over longer periods to determine the corrosion-initiation risk. Supplementary cementitious materials had a beneficial effect on the chloride-ion ingress resistance, significantly increased the predicted time to corrosion initiation beyond the 50-year design life and largely outweighed any observed detrimental effects from an increased coarse CCA content, suggesting that limitations imposed by existing design standards are conservative.

Funding

UK Engineering and Physical Sciences Research Council (grant number EP/G037272/1) and Loughborough University’s Centre for Innovative and Collaborative Construction Engineering and AECOM.

History

School

  • Architecture, Building and Civil Engineering

Published in

Proceedings of the Institution of Civil Engineers: Construction Materials

Volume

173

Issue

2

Pages

57 - 69

Citation

DODDS, W. ... et al., 2020. Corrosion risk assessment of structural concrete with coarse crushed concrete aggregate. Proceedings of the Institution of Civil Engineers: Construction Materials, 173 (2), pp.57-69.

Publisher

ICE Publishing

Version

VoR (Version of Record)

Publisher statement

This work is made available according to the conditions of the Creative Commons Attribution 4.0 International (CC BY 4.0) licence. Full details of this licence are available at: http://creativecommons.org/licenses/by/4.0/

Acceptance date

01/01/2017

Publication date

2017-11-09

Notes

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

ISSN

1747-650X

Language

en

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