Keywords: CKD, cement kiln dust, coal fly ash, calcium oxide, CaO, lime, LOI, loss on ignition, fineness, setting time, cement replacement, cement and concrete industries, green construction, waste management
CaO–LOI classification system for cement kiln dust
Cement Kiln Dust (CKD), a residual of cement production, has been used effectively as a cement replacement, but there is a lack of guidance for its appropriate selection and performance in specific engineering applications. Since CKD is not a controlled product, the chemical composition and material properties differ from source to source like coal fly ash. This paper presents a dual–letter classification system that identifies high or low lime (CaO) content and Loss On Ignition (LOI), based on a review of samples from 32 cement plants. Chemical and physical properties of CKD samples representing four classifications are evaluated.