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Chloride ion ingress and chloride-induced corrosion initiation of coarse CCA structural concrete

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conference contribution
posted on 02.08.2018, 14:04 by Wayne J. Dodds, Christian Christodoulou, D. Dunne, Chris Goodier, Simon Austin
The specification of crushed concrete aggregates (CCA) is increasing, with the construction industry still seeking new ways to improve the quality and performance. In higher value applications, such as structural concrete, further research is required to understand the effect of coarse CCAs, particularly on durability. This 4 year research programme investigated the effect of coarse CCA on transport mechanisms within CEM I and CEM III/A structural concretes, with particular emphasis on chloride ion ingress and corrosion initiation. CEM III/A concretes with up to 100% coarse CCA outperformed control CEM I concrete with 100% natural aggregates in durability performance tests, irrespective of the source of CCA. The results indicate that coarse CCA can be incorporated up to 60% replacement of natural aggregates if the criterion for compressive strength compliance at 28 days is relaxed for CEM III/A concretes. Water absorption, chemical and petrographic analysis, of the sources of coarse CCA with known compositions, had a good correlation with durability performance. This type of testing is recommended on future construction projects to mitigate potential risks.

Funding

The study was undertaken at Loughborough University’s Centre for Innovative and Collaborative Construction Engineering, in collaboration with the AECOM Structures team in Birmingham, and was funded by the Engineering and Physical Sciences Research Council (EPSRC - grant number EPG037272) and AECOM Ltd.

History

School

  • Architecture, Building and Civil Engineering

Published in

The Int. Federation for Structural Concrete 5th Int. fib Congress: Better - Smarter – Stronger

Citation

DODDS, W.J. ... et al., 2018. Chloride ion ingress and chloride-induced corrosion initiation of coarse CCA structural concrete. Presented at the 5th International Federation for Structural Concrete (Fib): Better - Smarter – Stronger, Melbourne, Australia, 7-11th Oct.

Publisher

© International Federation for Structural Concrete (fib)

Version

AM (Accepted Manuscript)

Publisher statement

This work is made available according to the conditions of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) licence. Full details of this licence are available at: https://creativecommons.org/licenses/by-nc-nd/4.0/

Acceptance date

09/05/2018

Publication date

2018

Notes

This is a conference paper.

Language

en

Location

Melbourne, Australia.

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