Title: Antiwashout Admixture (AWA) For Underwater Concrete Applications

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Publication: CIA

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Date: 2/13/2011

Abstract:
Placing concrete underwater poses a challenge to the contractor for various reasons that include the need to minimise washout of cement and fines during such an operation. Although de-watering is a solution, it is costly. An alternative to de-watering is the use of concretes that contain higher amounts of cement, pozzolans such as silica fume, or an antiwashout admixture. By far, the use of an antiwashout admixture (AWA) is the most effective option for minimising washout and producing concrete that has the desired properties for the underwater concreting application. This paper describes the antiwashout admixture technology and also contains evaluation of lab and field data that describe the effectiveness of an AWA and its applications.