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Resistivity and water absorption of concrete

conference contribution
posted on 18.11.2015, 15:08 by Chris GoodierChris Goodier, C. Xueting, Christian Christodoulou, D. Dunne, R. Yea
Corrosion is a significant cause of the deterioration of reinforced concrete structures. The main cause of corrosion is the ingress of aggressive chemicals such as chloride ions from salts. However, there is a lack of knowledge and understanding regarding the relationship between compressive strength, resistivity and water absorption of different concrete types - all of which are critical parameters influencing the chloride ingress rate and development of corrosion in reinforced concrete. Concrete cubes and cylinders with varying proportions of water-cement (w/c) ratios, Pulverised Fly Ash (PFA) (10-40% replacement), Ground Granulated Blastfurnace Slag (GGBS) (20-70% replacement) and Silica Fume (SF) (5-15%) contents were cast, and tested for compressive strength, hardened density, bulk and surface resistivity, and water absorption. The results showed that increasing the PFA, GGBS or SF replacement contents significantly increased both the surface and bulk resistivity of the concrete (e.g. with the 70% GGBS replacement, up to 9 times greater when compared to the control concrete). The addition of SF or GGBS had a considerable positive effect on the water absorption (even at low dosages), lowering it by up to a factor of 10. The PFA however, had little, or even an adverse, effect on the water absorption. Cement replacements such as PFA, GGBS and SF can therefore contribute significantly to improving the resistivity of concrete, and hence the resistance of concrete to chloride ingress, and should therefore be seriously considered for the majority of concretes designed for aggressive environments.

History

School

  • Architecture, Building and Civil Engineering

Published in

4th Int. Conf. on Concrete Repair, Rehabilitation and Retrofitting (ICCRRR)

Volume

1

Issue

1

Citation

GOODIER, C.I. ... et al, 2015. Resistivity and water absorption 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. 227-236.

Publisher

CRC Press (© Taylor and Francis Group, London).

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/

Publication date

2015

Notes

This article is closed access.

ISBN

1315677644;9781315677644

Language

en

Editor(s)

Dehn, F.;Beushausen, H.D.;Alexander, M.G.;Moyo, P.

Location

leipzig, germany

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