Effectiveness of Anti-Corrosion Products for Reinforced Concrete Exposed to United Arab Emirates Environmental Conditions

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Title: Effectiveness of Anti-Corrosion Products for Reinforced Concrete Exposed to United Arab Emirates Environmental Conditions

Author(s): A. Oasimi and S. M. K. Chetty

Publication: Special Publication

Volume: 222

Issue:

Appears on pages(s): 119-134

Keywords: chloride ingress; concrete; corrosion; electrochemical test; inhibitor; threshold

Date: 5/1/2004

Abstract:
A long-term research study on anti-corrosion products for reinforced concrete exposed to aggressive environmental conditions was initiated in 1990. The performance of products was evaluated through accelerated laboratory testing and natural site expo-sure conditions as tidal zone, above ground and below ground. An exposure site on the Dubai creek shore is designated for long term performance testing at different ages ex-tending up to ten years. A series of physical and electrochemical testing were performed in three phases. The prime objective of the first phase was to assess the performance of the various products, and to assess the practical value of different electrochemical test methods. The focus of the second phase testing shifted towards a more comprehensive evaluation of the test methods. The interim results have been presented at different international conferences. The focus of third phase, which was performed in early 2000, was to observe the actual extent of corrosion sustained by the rebar. This paper presents the final data to substantiate conclusions relating to ingress of chlorides for the various exposure conditions (threshold values), provides recommendations for corrosion monitoring for new structures and test methods for evaluating products and future research requirements.