Corrosion of Reinforcing Steel in Fly Ash Blended Cement Concrete
Publication: Journal of Materials in Civil Engineering
Volume 5, Issue 3
Abstract
Using a technique for accelerated corrosion monitoring, corrosion‐resisting characteristics of reinforcement of four plain and 36 fly ash blended cement concretes have been evaluated. Three fly ashes of bituminous, sub‐bituminous and lignite origins have been used, in conjunction with four plain cements having contents of 2%, 9%, 11%, and 14%. The 36 blended cements were formulated such that each of the four cements had 10%, 20%, and 30% cement replacements by each of the three fly ashes. Results of corrosion monitoring tests show that fly ash blending of plain cements by 30% partial replacement improved the corrosion‐resistance performance twofold to threefold over plain type I and type V cement concretes, respectively, in terms of corrosion‐initiation time. Fly ash of lignite origin exhibited better impermeability and corrosion‐resisting characteristics than bituminous and sub‐bituminous fly ashes. Level of replacement is a significant performance parameter, with the best performance observed for 30% replacement. The time to initiation of corrosion and weight loss were significantly influenced by the content of the cement; 9%, 11%, and 14% cements performed 1.75, 1.93, and 2.45 times better than the 2% cement in terms of corrosion‐initiation time. The beneficial effect was also operative in fly ash blended cement concretes, although on a reduced level.
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Information & Authors
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Published In
Journal of Materials in Civil Engineering
Volume 5 • Issue 3 • August 1993
Pages: 356 - 371
Copyright
Copyright © 1993 American Society of Civil Engineers.
History
Received: Mar 19, 1991
Published online: Aug 1, 1993
Published in print: Aug 1993
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