Preliminary examination of the system fly ash-bottom ash-flue gas desulphurization gypsum-portland cement-water for road construction

This paper describes an investigation into the use of three power plant wastes: fly ash,flue gas desulphurization gypsum,and bottom ash for subbase layers in road construction. two kinds of mixtures of these wastes with portland cement and water were made: first with fly ash consisting of coarser particles (<1.651 mm) and second with fly ash consisting of smaller particles (<0.42 mm). the mass ratio of fly ash-portland cement-flue gas desulphurization gypsum-bottom ash was the same (3: 1: 1: 5) in both mixtures. for both mixtures,the compressive strength,the mineralogical composition,and the leaching characteristics were determined at different times,7 and 28 days,after preparation. the obtained results showed that both mixtures could find a potential use for subbase layers in road construction. © 2013 r. tokalic et al.