Nature protection technologies

3.5.2.5. Mixed type binding systems. A sustainable alternative for RCC road pavements

Part 3. ASH AND SLAG HANDLING

3.5. Applications of ash and slag from power coals

3.5.2.5. Mixed type binding systems. A sustainable alternative for RCC road pavements

I. Papayianni, E. Anastasiou, M. Papachristoforou, Aristotle University of Thessaloniki, Greece

 The strength potential of alternative binders such as fly ashes, slags, natural pozzolans and metakaolin is not usually exploited to the maximum since their physicomechanical characteristics are rarely understood in detail. Provided that a thorough knowledge of the characteristics of supplementary cementing materials exists, the combination of high volume of them in a binding system could offer a sustainable alternative. In this paper, a binding system with high volume of calcareous fly ash and natural pozzolan and only with 20 % by mass Portland clinker has been used for the bedding of part of a rural road, constructed by EGNATIA ODOS S.A. in Greece. The concrete mixture and its properties in fresh and hardened state, as well as its technical details, are reported. Problems during construction are mentioned and short and long term test results concerning the concrete road pavement performance are also given.