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Please use this identifier to cite or link to this item: https://dspace.lboro.ac.uk/2134/34280

Title: Chloride ion ingress and chloride-induced corrosion initiation of coarse CCA structural concrete
Authors: Dodds, Wayne J.
Christodoulou, Christian
Dunne, D.
Goodier, Chris I.
Austin, Simon A.
Keywords: Coarse aggregate
CCA
Chloride ion ingress
Durability
Recycling
Issue Date: 2018
Publisher: © International Federation for Structural Concrete (fib)
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.
Abstract: 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.
Description: This is a conference paper.
Sponsor: 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.
Version: Accepted for publication
URI: https://dspace.lboro.ac.uk/2134/34280
Publisher Link: https://fibcongress2018.com/
Appears in Collections:Conference Papers and Presentations (Architecture, Building and Civil Engineering)

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