posted on 2015-11-18, 15:08authored byChris 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.
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.