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Chloride ingress testing of concrete

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conference contribution
posted on 2015-11-18, 15:02 authored by D. Dunne, Christian Christodoulou, M.D. Newlands, P. McKenna, Chris GoodierChris Goodier

Concrete is recognised as a durable material that can provide long-term protection to embedded carbon steel reinforcement. However, effective protection can only be achieved if the mechanisms of deterioration and the durability properties of the protective material involved are fully understood. A well-known phenomenon is the ingress of chloride ions into concrete, which takes place via the solution-filled pores. These ions, combined with optimum contents of air and moisture, result in reinforcement corrosion, and subsequently, loss in functionality of a reinforced concrete element. Currently, available literature suggests that measurement of chloride ion ingress into concrete can be misleading. Reasons for erroneous measurements include: (i) continuing formation of hydration products resulting in pore refinement/pore blocking and; (ii) chloride diffusion coefficients being commonly applied as the “effective” diffusivity, which does not take into account the effect of chemical binding on the chloride ion transport process. This paper reports the findings of an investigation of different chloride test methods for measuring chloride ingress of concrete, which are currently used. This was undertaken to establish their suitability to measure this intrinsic concrete durability property. Five test methods were selected, covering the two main test method types that currently finding application: (i) electrically accelerated short-term; and (ii) naturally accelerated long-term chloride test methods. Three concrete types of CEM I, PC/FA (20-55%) and PC/GGBS (25-75%) at varying water-cement (w/c) ratios of 0.35, 0.50 and 0.65 were utilised during the investigation. This work has established that whilst all the test methods demonstrated capacities to measure chloride ingress into concrete, operator accuracy is of significant importance.

History

School

  • Architecture, Building and Civil Engineering

Published in

Concrete Repair, Rehabilitation and Retrofitting IV: Proceedings of the 4th International Conference on Concrete Repair, Rehabilitation and Retrofitting (ICCRRR-4)

Pages

3-10

Citation

DUNNE, D. ... et al, 2015. Chloride ingress testing of concrete. IN: Dehn, F. et al (eds). Concrete Repair, Rehabilitation and Retrofitting IV: Proceedings of the 4th International Conference on Concrete Repair, Rehabilitation and Retrofitting (ICCRRR-4), 5th-7th October 2015, Leipzig, Germany. CRC Press, pp. 3-10.

Source

4th International Conference on Concrete Repair, Rehabilitation and Retrofitting (ICCRRR-4)

Publisher

CRC Press

Version

  • AM (Accepted Manuscript)

Rights holder

© Taylor and Francis Group, London

Publisher statement

This is an Accepted Manuscript of a book chapter published by CRC Press in Concrete Repair, Rehabilitation and Retrofitting IV: Proceedings of the 4th International Conference on Concrete Repair, Rehabilitation and Retrofitting (ICCRRR-4) on September 17, 2015, available online: http://www.crcpress.com/9781138028432. 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/

Publication date

2015-09-17

Copyright date

2016

ISBN

1138028436; 9781138028432; 9781315677644

Language

  • en

Editor(s)

Frank Dehn; Hans-Dieter Beushausen; Mark G Alexander; Pilate Moyo

Location

Leipzig, Germany

Event dates

5th October 2015 - 7th October 2015

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