Demirbaş A.Aslan A.2024-07-222024-07-22199900088846http://akademikarsiv.cbu.edu.tr:4000/handle/123456789/20603In this study the physical and chemical properties of lignite fly ashes obtained from electrostatic precipitator and cyclone, lignite bottom ash, cement+lignite ash mixtures, and their effects on mechanical properties of concrete were investigated. The ashes were classified into two general types based on total silica, alumina, and iron-III oxide: class A and class B. When 25% of the cement was replaced by class A lignite bottom ash (the combined three oxide contents were 30.2%), the 28-day compressive strength increased by 18.9% compared to the control mix, and when 25% of the cement was replaced by class B lignite ash (the combined three oxide contents were 78.1%), the compressive strength decreased by 3.5% compared to the control mix. The results obtained were compared with the Turkish Standards and, in general, were found to be within the limits. As a result, the lignite fly ash and bottom ash samples may be used as cementitious materials.EnglishBending strengthCompressive strengthConcretesElectrostatic separatorsFly ashHydrationLigniteStandardsLignite combustion residuesCement additivesArticle10.1016/S0008-8846(99)00014-9