ABSTRACT
Abstract Over the past decades, numerous laboratory studies have clearly indicated that the use of supplementary cementing materials, and particularly fly ash, can significantly reduce the scaling durability of properly air-entrained concrete. Despite the great deal of research done on the topic, the reasons behind the detrimental influence of fly ash remain unclear. In order to bring more information on the subject, a comprehensive investigation of the influence of fly ash on the deicer salt scaling resistance of concrete has been recently carried out in our laboratory. This report summarizes the main results of the project. The effects of fly ash (originating from various sources) on the pore structure of concrete, cement hydration and ice formation are presented. The influence of fly ash on concrete microstructure and deicer salt scaling resistance is also discussed. Keywords: Fly ash, microstructure, deicer salt scaling, ice formation, durability.
